new file mode 100644
--- /dev/null
+++ b/src/window.c
@@ -0,0 +1,4946 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read a list of people who contributed.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+#include "vim.h"
+
+#ifdef HAVE_FCNTL_H
+# include <fcntl.h>	    /* for chdir() */
+#endif
+
+static int path_is_url __ARGS((char_u *p));
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+static int win_split_ins __ARGS((int size, int flags, win_T *newwin, int dir));
+static int win_comp_pos __ARGS((void));
+static void frame_comp_pos __ARGS((frame_T *topfrp, int *row, int *col));
+static void frame_setheight __ARGS((frame_T *curfrp, int height));
+#ifdef FEAT_VERTSPLIT
+static void frame_setwidth __ARGS((frame_T *curfrp, int width));
+#endif
+static void win_exchange __ARGS((long));
+static void win_rotate __ARGS((int, int));
+static void win_totop __ARGS((int size, int flags));
+static void win_equal_rec __ARGS((win_T *next_curwin, int current, frame_T *topfr, int dir, int col, int row, int width, int height));
+static win_T *winframe_remove __ARGS((win_T *win, int *dirp));
+static frame_T *win_altframe __ARGS((win_T *win));
+static win_T *frame2win __ARGS((frame_T *frp));
+static int frame_has_win __ARGS((frame_T *frp, win_T *wp));
+static void frame_new_height __ARGS((frame_T *topfrp, int height, int topfirst, int wfh));
+static int frame_fixed_height __ARGS((frame_T *frp));
+#ifdef FEAT_VERTSPLIT
+static void frame_add_statusline __ARGS((frame_T *frp));
+static void frame_new_width __ARGS((frame_T *topfrp, int width, int leftfirst));
+static void frame_add_vsep __ARGS((frame_T *frp));
+static int frame_minwidth __ARGS((frame_T *topfrp, win_T *next_curwin));
+static void frame_fix_width __ARGS((win_T *wp));
+#endif
+static void frame_fix_height __ARGS((win_T *wp));
+static int frame_minheight __ARGS((frame_T *topfrp, win_T *next_curwin));
+static void win_enter_ext __ARGS((win_T *wp, int undo_sync, int no_curwin));
+static void win_free __ARGS((win_T *wp));
+static void win_append __ARGS((win_T *, win_T *));
+static void win_remove __ARGS((win_T *));
+static void frame_append __ARGS((frame_T *after, frame_T *frp));
+static void frame_insert __ARGS((frame_T *before, frame_T *frp));
+static void frame_remove __ARGS((frame_T *frp));
+#ifdef FEAT_VERTSPLIT
+static void win_new_width __ARGS((win_T *wp, int width));
+static int win_minheight __ARGS((win_T *wp));
+static void win_goto_ver __ARGS((int up, long count));
+static void win_goto_hor __ARGS((int left, long count));
+#endif
+static void frame_add_height __ARGS((frame_T *frp, int n));
+static void last_status_rec __ARGS((frame_T *fr, int statusline));
+
+static void make_snapshot __ARGS((void));
+static void make_snapshot_rec __ARGS((frame_T *fr, frame_T **frp));
+static void clear_snapshot __ARGS((void));
+static void clear_snapshot_rec __ARGS((frame_T *fr));
+static void restore_snapshot __ARGS((int close_curwin));
+static int check_snapshot_rec __ARGS((frame_T *sn, frame_T *fr));
+static win_T *restore_snapshot_rec __ARGS((frame_T *sn, frame_T *fr));
+
+#endif /* FEAT_WINDOWS */
+static win_T *win_alloc __ARGS((win_T *after));
+static void win_new_height __ARGS((win_T *, int));
+
+#define URL_SLASH	1		/* path_is_url() has found "://" */
+#define URL_BACKSLASH	2		/* path_is_url() has found ":\\" */
+
+#define NOWIN		(win_T *)-1	/* non-exisiting window */
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+/*
+ * all CTRL-W window commands are handled here, called from normal_cmd().
+ */
+    void
+do_window(nchar, Prenum, xchar)
+    int		nchar;
+    long	Prenum;
+    int		xchar;	    /* extra char from ":wincmd gx" or NUL */
+{
+    long	Prenum1;
+    win_T	*wp;
+#if defined(FEAT_SEARCHPATH) || defined(FEAT_FIND_ID)
+    char_u	*ptr;
+#endif
+#ifdef FEAT_FIND_ID
+    int		type = FIND_DEFINE;
+    int		len;
+#endif
+    char_u	cbuf[40];
+
+    if (Prenum == 0)
+	Prenum1 = 1;
+    else
+	Prenum1 = Prenum;
+
+#ifdef FEAT_CMDWIN
+# define CHECK_CMDWIN if (cmdwin_type != 0) { EMSG(_(e_cmdwin)); break; }
+#else
+# define CHECK_CMDWIN
+#endif
+
+    switch (nchar)
+    {
+/* split current window in two parts, horizontally */
+    case 'S':
+    case Ctrl_S:
+    case 's':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_split((int)Prenum, 0);
+		break;
+
+#ifdef FEAT_VERTSPLIT
+/* split current window in two parts, vertically */
+    case Ctrl_V:
+    case 'v':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_split((int)Prenum, WSP_VERT);
+		break;
+#endif
+
+/* split current window and edit alternate file */
+    case Ctrl_HAT:
+    case '^':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		STRCPY(cbuf, "split #");
+		if (Prenum)
+		    sprintf((char *)cbuf + 7, "%ld", Prenum);
+		do_cmdline_cmd(cbuf);
+		break;
+
+/* open new window */
+    case Ctrl_N:
+    case 'n':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		if (Prenum)
+		    sprintf((char *)cbuf, "%ld", Prenum); /* window height */
+		else
+		    cbuf[0] = NUL;
+		STRCAT(cbuf, "new");
+		do_cmdline_cmd(cbuf);
+		break;
+
+/* quit current window */
+    case Ctrl_Q:
+    case 'q':
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		do_cmdline_cmd((char_u *)"quit");
+		break;
+
+/* close current window */
+    case Ctrl_C:
+    case 'c':
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		do_cmdline_cmd((char_u *)"close");
+		break;
+
+#if defined(FEAT_WINDOWS) && defined(FEAT_QUICKFIX)
+/* close preview window */
+    case Ctrl_Z:
+    case 'z':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		do_cmdline_cmd((char_u *)"pclose");
+		break;
+
+/* cursor to preview window */
+    case 'P':
+		for (wp = firstwin; wp != NULL; wp = wp->w_next)
+		    if (wp->w_p_pvw)
+			break;
+		if (wp == NULL)
+		    EMSG(_("E441: There is no preview window"));
+		else
+		    win_goto(wp);
+		break;
+#endif
+
+/* close all but current window */
+    case Ctrl_O:
+    case 'o':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		do_cmdline_cmd((char_u *)"only");
+		break;
+
+/* cursor to next window with wrap around */
+    case Ctrl_W:
+    case 'w':
+/* cursor to previous window with wrap around */
+    case 'W':
+		CHECK_CMDWIN
+		if (lastwin == firstwin && Prenum != 1)	/* just one window */
+		    beep_flush();
+		else
+		{
+		    if (Prenum)			/* go to specified window */
+		    {
+			for (wp = firstwin; --Prenum > 0; )
+			{
+			    if (wp->w_next == NULL)
+				break;
+			    else
+				wp = wp->w_next;
+			}
+		    }
+		    else
+		    {
+			if (nchar == 'W')	    /* go to previous window */
+			{
+			    wp = curwin->w_prev;
+			    if (wp == NULL)
+				wp = lastwin;	    /* wrap around */
+			}
+			else			    /* go to next window */
+			{
+			    wp = curwin->w_next;
+			    if (wp == NULL)
+				wp = firstwin;	    /* wrap around */
+			}
+		    }
+		    win_goto(wp);
+		}
+		break;
+
+/* cursor to window below */
+    case 'j':
+    case K_DOWN:
+    case Ctrl_J:
+		CHECK_CMDWIN
+#ifdef FEAT_VERTSPLIT
+		win_goto_ver(FALSE, Prenum1);
+#else
+		for (wp = curwin; wp->w_next != NULL && Prenum1-- > 0;
+							    wp = wp->w_next)
+		    ;
+		win_goto(wp);
+#endif
+		break;
+
+/* cursor to window above */
+    case 'k':
+    case K_UP:
+    case Ctrl_K:
+		CHECK_CMDWIN
+#ifdef FEAT_VERTSPLIT
+		win_goto_ver(TRUE, Prenum1);
+#else
+		for (wp = curwin; wp->w_prev != NULL && Prenum1-- > 0;
+							    wp = wp->w_prev)
+		    ;
+		win_goto(wp);
+#endif
+		break;
+
+#ifdef FEAT_VERTSPLIT
+/* cursor to left window */
+    case 'h':
+    case K_LEFT:
+    case Ctrl_H:
+    case K_BS:
+		CHECK_CMDWIN
+		win_goto_hor(TRUE, Prenum1);
+		break;
+
+/* cursor to right window */
+    case 'l':
+    case K_RIGHT:
+    case Ctrl_L:
+		CHECK_CMDWIN
+		win_goto_hor(FALSE, Prenum1);
+		break;
+#endif
+
+/* cursor to top-left window */
+    case 't':
+    case Ctrl_T:
+		win_goto(firstwin);
+		break;
+
+/* cursor to bottom-right window */
+    case 'b':
+    case Ctrl_B:
+		win_goto(lastwin);
+		break;
+
+/* cursor to last accessed (previous) window */
+    case 'p':
+    case Ctrl_P:
+		if (prevwin == NULL)
+		    beep_flush();
+		else
+		    win_goto(prevwin);
+		break;
+
+/* exchange current and next window */
+    case 'x':
+    case Ctrl_X:
+		CHECK_CMDWIN
+		win_exchange(Prenum);
+		break;
+
+/* rotate windows downwards */
+    case Ctrl_R:
+    case 'r':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		win_rotate(FALSE, (int)Prenum1);    /* downwards */
+		break;
+
+/* rotate windows upwards */
+    case 'R':
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		win_rotate(TRUE, (int)Prenum1);	    /* upwards */
+		break;
+
+/* move window to the very top/bottom/left/right */
+    case 'K':
+    case 'J':
+#ifdef FEAT_VERTSPLIT
+    case 'H':
+    case 'L':
+#endif
+		CHECK_CMDWIN
+		win_totop((int)Prenum,
+			((nchar == 'H' || nchar == 'L') ? WSP_VERT : 0)
+			| ((nchar == 'H' || nchar == 'K') ? WSP_TOP : WSP_BOT));
+		break;
+
+/* make all windows the same height */
+    case '=':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_equal(NULL, FALSE, 'b');
+		break;
+
+/* increase current window height */
+    case '+':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setheight(curwin->w_height + (int)Prenum1);
+		break;
+
+/* decrease current window height */
+    case '-':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setheight(curwin->w_height - (int)Prenum1);
+		break;
+
+/* set current window height */
+    case Ctrl__:
+    case '_':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setheight(Prenum ? (int)Prenum : 9999);
+		break;
+
+#ifdef FEAT_VERTSPLIT
+/* increase current window width */
+    case '>':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setwidth(curwin->w_width + (int)Prenum1);
+		break;
+
+/* decrease current window width */
+    case '<':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setwidth(curwin->w_width - (int)Prenum1);
+		break;
+
+/* set current window width */
+    case '|':
+#ifdef FEAT_GUI
+		need_mouse_correct = TRUE;
+#endif
+		win_setwidth(Prenum != 0 ? (int)Prenum : 9999);
+		break;
+#endif
+
+/* jump to tag and split window if tag exists (in preview window) */
+#if defined(FEAT_QUICKFIX)
+    case '}':
+		CHECK_CMDWIN
+		if (Prenum)
+		    g_do_tagpreview = Prenum;
+		else
+		    g_do_tagpreview = p_pvh;
+		/*FALLTHROUGH*/
+#endif
+    case ']':
+    case Ctrl_RSB:
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		if (Prenum)
+		    postponed_split = Prenum;
+		else
+		    postponed_split = -1;
+
+		/* Execute the command right here, required when
+		 * "wincmd ]" was used in a function. */
+		do_nv_ident(Ctrl_RSB, NUL);
+		break;
+
+#ifdef FEAT_SEARCHPATH
+/* edit file name under cursor in a new window */
+    case 'f':
+    case Ctrl_F:
+		CHECK_CMDWIN
+#ifdef FEAT_VISUAL
+		reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+		ptr = file_name_at_cursor(FNAME_MESS|FNAME_HYP|FNAME_EXP,
+								     Prenum1);
+		if (ptr != NULL)
+		{
+#ifdef FEAT_GUI
+		    need_mouse_correct = TRUE;
+#endif
+		    setpcmark();
+		    if (win_split(0, 0) == OK)
+		    {
+# ifdef FEAT_SCROLLBIND
+			curwin->w_p_scb = FALSE;
+# endif
+			(void)do_ecmd(0, ptr, NULL, NULL, ECMD_LASTL,
+								   ECMD_HIDE);
+		    }
+		    vim_free(ptr);
+		}
+		break;
+#endif
+
+#ifdef FEAT_FIND_ID
+/* Go to the first occurence of the identifier under cursor along path in a
+ * new window -- webb
+ */
+    case 'i':			    /* Go to any match */
+    case Ctrl_I:
+		type = FIND_ANY;
+		/* FALLTHROUGH */
+    case 'd':			    /* Go to definition, using 'define' */
+    case Ctrl_D:
+		CHECK_CMDWIN
+		if ((len = find_ident_under_cursor(&ptr, FIND_IDENT)) == 0)
+		    break;
+		find_pattern_in_path(ptr, 0, len, TRUE,
+			Prenum == 0 ? TRUE : FALSE, type,
+			Prenum1, ACTION_SPLIT, (linenr_T)1, (linenr_T)MAXLNUM);
+		curwin->w_set_curswant = TRUE;
+		break;
+#endif
+
+/* CTRL-W g  extended commands */
+    case 'g':
+    case Ctrl_G:
+		CHECK_CMDWIN
+#ifdef USE_ON_FLY_SCROLL
+		dont_scroll = TRUE;		/* disallow scrolling here */
+#endif
+		++no_mapping;
+		++allow_keys;   /* no mapping for xchar, but allow key codes */
+		if (xchar == NUL)
+		    xchar = safe_vgetc();
+#ifdef FEAT_LANGMAP
+		LANGMAP_ADJUST(xchar, TRUE);
+#endif
+		--no_mapping;
+		--allow_keys;
+#ifdef FEAT_CMDL_INFO
+		(void)add_to_showcmd(xchar);
+#endif
+		switch (xchar)
+		{
+#if defined(FEAT_QUICKFIX)
+		    case '}':
+			xchar = Ctrl_RSB;
+			if (Prenum)
+			    g_do_tagpreview = Prenum;
+			else
+			    g_do_tagpreview = p_pvh;
+			/*FALLTHROUGH*/
+#endif
+		    case ']':
+		    case Ctrl_RSB:
+#ifdef FEAT_VISUAL
+			reset_VIsual_and_resel();	/* stop Visual mode */
+#endif
+			if (Prenum)
+			    postponed_split = Prenum;
+			else
+			    postponed_split = -1;
+
+			/* Execute the command right here, required when
+			 * "wincmd g}" was used in a function. */
+			do_nv_ident('g', xchar);
+			break;
+
+		    default:
+			beep_flush();
+			break;
+		}
+		break;
+
+    default:	beep_flush();
+		break;
+    }
+}
+
+/*
+ * split the current window, implements CTRL-W s and :split
+ *
+ * "size" is the height or width for the new window, 0 to use half of current
+ * height or width.
+ *
+ * "flags":
+ * WSP_ROOM: require enough room for new window
+ * WSP_VERT: vertical split.
+ * WSP_TOP:  open window at the top-left of the shell (help window).
+ * WSP_BOT:  open window at the bottom-right of the shell (quickfix window).
+ * WSP_HELP: creating the help window, keep layout snapshot
+ *
+ * return FAIL for failure, OK otherwise
+ */
+    int
+win_split(size, flags)
+    int		size;
+    int		flags;
+{
+    /* Add flags from ":vertical", ":topleft" and ":botright". */
+    flags |= cmdmod.split;
+    if ((flags & WSP_TOP) && (flags & WSP_BOT))
+    {
+	EMSG(_("E442: Can't split topleft and botright at the same time"));
+	return FAIL;
+    }
+
+    /* When creating the help window make a snapshot of the window layout.
+     * Otherwise clear the snapshot, it's now invalid. */
+    if (flags & WSP_HELP)
+	make_snapshot();
+    else
+	clear_snapshot();
+
+    return win_split_ins(size, flags, NULL, 0);
+}
+
+/*
+ * When "newwin" is NULL: split a window in two.
+ * When "newwin" is not NULL: insert this window at the far
+ * top/left/right/bottom.
+ * return FAIL for failure, OK otherwise
+ */
+    static int
+win_split_ins(size, flags, newwin, dir)
+    int		size;
+    int		flags;
+    win_T	*newwin;
+    int		dir;
+{
+    win_T	*wp = newwin;
+    win_T	*oldwin;
+    int		new_size = size;
+    int		i;
+    int		need_status = 0;
+    int		do_equal = FALSE;
+    int		needed;
+    int		available;
+    int		oldwin_height = 0;
+    int		layout;
+    frame_T	*frp, *curfrp;
+    int		before;
+
+    if (flags & WSP_TOP)
+	oldwin = firstwin;
+    else if (flags & WSP_BOT)
+	oldwin = lastwin;
+    else
+	oldwin = curwin;
+
+    /* add a status line when p_ls == 1 and splitting the first window */
+    if (lastwin == firstwin && p_ls == 1 && oldwin->w_status_height == 0)
+    {
+	if (oldwin->w_height <= p_wmh && newwin == NULL)
+	{
+	    EMSG(_(e_noroom));
+	    return FAIL;
+	}
+	need_status = STATUS_HEIGHT;
+    }
+
+#ifdef FEAT_VERTSPLIT
+    if (flags & WSP_VERT)
+    {
+	layout = FR_ROW;
+	do_equal = (p_ea && new_size == 0 && *p_ead != 'v');
+
+	/*
+	 * Check if we are able to split the current window and compute its
+	 * width.
+	 */
+	needed = p_wmw + 1;
+	if (flags & WSP_ROOM)
+	    needed += p_wiw - p_wmw;
+	if (p_ea || (flags & (WSP_BOT | WSP_TOP)))
+	{
+	    available = topframe->fr_width;
+	    needed += frame_minwidth(topframe, NULL);
+	}
+	else
+	    available = oldwin->w_width;
+	if (available < needed && newwin == NULL)
+	{
+	    EMSG(_(e_noroom));
+	    return FAIL;
+	}
+	if (new_size == 0)
+	    new_size = oldwin->w_width / 2;
+	if (new_size > oldwin->w_width - p_wmw - 1)
+	    new_size = oldwin->w_width - p_wmw - 1;
+	if (new_size < p_wmw)
+	    new_size = p_wmw;
+
+	/* if it doesn't fit in the current window, need win_equal() */
+	if (oldwin->w_width - new_size - 1 < p_wmw)
+	    do_equal = TRUE;
+    }
+    else
+#endif
+    {
+	layout = FR_COL;
+	do_equal = (p_ea && new_size == 0
+#ifdef FEAT_VERTSPLIT
+		&& *p_ead != 'h'
+#endif
+		);
+
+	/*
+	 * Check if we are able to split the current window and compute its
+	 * height.
+	 */
+	needed = p_wmh + STATUS_HEIGHT + need_status;
+	if (flags & WSP_ROOM)
+	    needed += p_wh - p_wmh;
+	if (p_ea || (flags & (WSP_BOT | WSP_TOP)))
+	{
+	    available = topframe->fr_height;
+	    needed += frame_minheight(topframe, NULL);
+	}
+	else
+	{
+	    available = oldwin->w_height;
+	    needed += p_wmh;
+	}
+	if (available < needed && newwin == NULL)
+	{
+	    EMSG(_(e_noroom));
+	    return FAIL;
+	}
+	oldwin_height = oldwin->w_height;
+	if (need_status)
+	{
+	    oldwin->w_status_height = STATUS_HEIGHT;
+	    oldwin_height -= STATUS_HEIGHT;
+	}
+	if (new_size == 0)
+	    new_size = oldwin_height / 2;
+
+	if (new_size > oldwin_height - p_wmh - STATUS_HEIGHT)
+	    new_size = oldwin_height - p_wmh - STATUS_HEIGHT;
+	if (new_size < p_wmh)
+	    new_size = p_wmh;
+
+	/* if it doesn't fit in the current window, need win_equal() */
+	if (oldwin_height - new_size - STATUS_HEIGHT < p_wmh)
+	    do_equal = TRUE;
+
+	/* We don't like to take lines for the new window from a
+	 * 'winfixheight' window.  Take them from a window above or below
+	 * instead, if possible. */
+	if (oldwin->w_p_wfh)
+	{
+	    win_setheight_win(oldwin->w_height + new_size + STATUS_HEIGHT,
+								      oldwin);
+	    oldwin_height = oldwin->w_height;
+	    if (need_status)
+		oldwin_height -= STATUS_HEIGHT;
+	}
+    }
+
+    /*
+     * allocate new window structure and link it in the window list
+     */
+    if ((flags & WSP_TOP) == 0
+	    && ((flags & WSP_BOT)
+		|| (flags & WSP_BELOW)
+		|| (!(flags & WSP_ABOVE)
+		    && (
+#ifdef FEAT_VERTSPLIT
+			(flags & WSP_VERT) ? p_spr :
+#endif
+			p_sb))))
+    {
+	/* new window below/right of current one */
+	if (newwin == NULL)
+	    wp = win_alloc(oldwin);
+	else
+	    win_append(oldwin, wp);
+    }
+    else
+    {
+	if (newwin == NULL)
+	    wp = win_alloc(oldwin->w_prev);
+	else
+	    win_append(oldwin->w_prev, wp);
+    }
+
+    if (newwin == NULL)
+    {
+	if (wp == NULL)
+	    return FAIL;
+
+	/*
+	 * make the contents of the new window the same as the current one
+	 */
+	wp->w_buffer = curbuf;
+	curbuf->b_nwindows++;
+	wp->w_cursor = curwin->w_cursor;
+	wp->w_valid = 0;
+	wp->w_curswant = curwin->w_curswant;
+	wp->w_set_curswant = curwin->w_set_curswant;
+	wp->w_topline = curwin->w_topline;
+#ifdef FEAT_DIFF
+	wp->w_topfill = curwin->w_topfill;
+#endif
+	wp->w_leftcol = curwin->w_leftcol;
+	wp->w_pcmark = curwin->w_pcmark;
+	wp->w_prev_pcmark = curwin->w_prev_pcmark;
+	wp->w_alt_fnum = curwin->w_alt_fnum;
+	wp->w_fraction = curwin->w_fraction;
+	wp->w_prev_fraction_row = curwin->w_prev_fraction_row;
+#ifdef FEAT_JUMPLIST
+	copy_jumplist(curwin, wp);
+#endif
+	if (curwin->w_localdir != NULL)
+	    wp->w_localdir = vim_strsave(curwin->w_localdir);
+
+	/* Use the same argument list. */
+	wp->w_alist = curwin->w_alist;
+	++wp->w_alist->al_refcount;
+	wp->w_arg_idx = curwin->w_arg_idx;
+
+	/*
+	 * copy tagstack and options from existing window
+	 */
+	for (i = 0; i < curwin->w_tagstacklen; i++)
+	{
+	    wp->w_tagstack[i] = curwin->w_tagstack[i];
+	    if (wp->w_tagstack[i].tagname != NULL)
+		wp->w_tagstack[i].tagname =
+				       vim_strsave(wp->w_tagstack[i].tagname);
+	}
+	wp->w_tagstackidx = curwin->w_tagstackidx;
+	wp->w_tagstacklen = curwin->w_tagstacklen;
+	win_copy_options(curwin, wp);
+#ifdef FEAT_FOLDING
+	copyFoldingState(curwin, wp);
+#endif
+    }
+
+    /*
+     * Reorganise the tree of frames to insert the new window.
+     */
+    if (flags & (WSP_TOP | WSP_BOT))
+    {
+#ifdef FEAT_VERTSPLIT
+	if ((topframe->fr_layout == FR_COL && (flags & WSP_VERT) == 0)
+	    || (topframe->fr_layout == FR_ROW && (flags & WSP_VERT) != 0))
+#else
+	if (topframe->fr_layout == FR_COL)
+#endif
+	{
+	    curfrp = topframe->fr_child;
+	    if (flags & WSP_BOT)
+		while (curfrp->fr_next != NULL)
+		    curfrp = curfrp->fr_next;
+	}
+	else
+	    curfrp = topframe;
+	before = (flags & WSP_TOP);
+    }
+    else
+    {
+	curfrp = oldwin->w_frame;
+	if (flags & WSP_BELOW)
+	    before = FALSE;
+	else if (flags & WSP_ABOVE)
+	    before = TRUE;
+	else
+#ifdef FEAT_VERTSPLIT
+	if (flags & WSP_VERT)
+	    before = !p_spr;
+	else
+#endif
+	    before = !p_sb;
+    }
+    if (curfrp->fr_parent == NULL || curfrp->fr_parent->fr_layout != layout)
+    {
+	/* Need to create a new frame in the tree to make a branch. */
+	frp = (frame_T *)alloc_clear((unsigned)sizeof(frame_T));
+	*frp = *curfrp;
+	curfrp->fr_layout = layout;
+	frp->fr_parent = curfrp;
+	frp->fr_next = NULL;
+	frp->fr_prev = NULL;
+	curfrp->fr_child = frp;
+	curfrp->fr_win = NULL;
+	curfrp = frp;
+	if (frp->fr_win != NULL)
+	    oldwin->w_frame = frp;
+	else
+	    for (frp = frp->fr_child; frp != NULL; frp = frp->fr_next)
+		frp->fr_parent = curfrp;
+    }
+
+    if (newwin == NULL)
+    {
+	/* Create a frame for the new window. */
+	frp = (frame_T *)alloc_clear((unsigned)sizeof(frame_T));
+	frp->fr_layout = FR_LEAF;
+	frp->fr_win = wp;
+	wp->w_frame = frp;
+    }
+    else
+	frp = newwin->w_frame;
+    frp->fr_parent = curfrp->fr_parent;
+
+    /* Insert the new frame at the right place in the frame list. */
+    if (before)
+	frame_insert(curfrp, frp);
+    else
+	frame_append(curfrp, frp);
+
+#ifdef FEAT_VERTSPLIT
+    if (flags & WSP_VERT)
+    {
+	wp->w_p_scr = curwin->w_p_scr;
+	if (need_status)
+	{
+	    --oldwin->w_height;
+	    oldwin->w_status_height = need_status;
+	}
+	if (flags & (WSP_TOP | WSP_BOT))
+	{
+	    /* set height and row of new window to full height */
+	    wp->w_winrow = 0;
+	    wp->w_height = curfrp->fr_height - (p_ls > 0);
+	    wp->w_status_height = (p_ls > 0);
+	}
+	else
+	{
+	    /* height and row of new window is same as current window */
+	    wp->w_winrow = oldwin->w_winrow;
+	    wp->w_height = oldwin->w_height;
+	    wp->w_status_height = oldwin->w_status_height;
+	}
+	frp->fr_height = curfrp->fr_height;
+
+	/* "new_size" of the current window goes to the new window, use
+	 * one column for the vertical separator */
+	wp->w_width = new_size;
+	if (before)
+	    wp->w_vsep_width = 1;
+	else
+	{
+	    wp->w_vsep_width = oldwin->w_vsep_width;
+	    oldwin->w_vsep_width = 1;
+	}
+	if (flags & (WSP_TOP | WSP_BOT))
+	{
+	    if (flags & WSP_BOT)
+		frame_add_vsep(curfrp);
+	    /* Set width of neighbor frame */
+	    frame_new_width(curfrp, curfrp->fr_width
+		    - (new_size + ((flags & WSP_TOP) != 0)), flags & WSP_TOP);
+	}
+	else
+	    oldwin->w_width -= new_size + 1;
+	if (before)	/* new window left of current one */
+	{
+	    wp->w_wincol = oldwin->w_wincol;
+	    oldwin->w_wincol += new_size + 1;
+	}
+	else		/* new window right of current one */
+	    wp->w_wincol = oldwin->w_wincol + oldwin->w_width + 1;
+	frame_fix_width(oldwin);
+	frame_fix_width(wp);
+    }
+    else
+#endif
+    {
+	/* width and column of new window is same as current window */
+#ifdef FEAT_VERTSPLIT
+	if (flags & (WSP_TOP | WSP_BOT))
+	{
+	    wp->w_wincol = 0;
+	    wp->w_width = Columns;
+	    wp->w_vsep_width = 0;
+	}
+	else
+	{
+	    wp->w_wincol = oldwin->w_wincol;
+	    wp->w_width = oldwin->w_width;
+	    wp->w_vsep_width = oldwin->w_vsep_width;
+	}
+	frp->fr_width = curfrp->fr_width;
+#endif
+
+	/* "new_size" of the current window goes to the new window, use
+	 * one row for the status line */
+	win_new_height(wp, new_size);
+	if (flags & (WSP_TOP | WSP_BOT))
+	    frame_new_height(curfrp, curfrp->fr_height
+			- (new_size + STATUS_HEIGHT), flags & WSP_TOP, FALSE);
+	else
+	    win_new_height(oldwin, oldwin_height - (new_size + STATUS_HEIGHT));
+	if (before)	/* new window above current one */
+	{
+	    wp->w_winrow = oldwin->w_winrow;
+	    wp->w_status_height = STATUS_HEIGHT;
+	    oldwin->w_winrow += wp->w_height + STATUS_HEIGHT;
+	}
+	else		/* new window below current one */
+	{
+	    wp->w_winrow = oldwin->w_winrow + oldwin->w_height + STATUS_HEIGHT;
+	    wp->w_status_height = oldwin->w_status_height;
+	    oldwin->w_status_height = STATUS_HEIGHT;
+	}
+#ifdef FEAT_VERTSPLIT
+	if (flags & WSP_BOT)
+	    frame_add_statusline(curfrp);
+#endif
+	frame_fix_height(wp);
+	frame_fix_height(oldwin);
+    }
+
+    if (flags & (WSP_TOP | WSP_BOT))
+	(void)win_comp_pos();
+
+    /*
+     * Both windows need redrawing
+     */
+    redraw_win_later(wp, NOT_VALID);
+    wp->w_redr_status = TRUE;
+    redraw_win_later(oldwin, NOT_VALID);
+    oldwin->w_redr_status = TRUE;
+
+    if (need_status)
+    {
+	msg_row = Rows - 1;
+	msg_col = sc_col;
+	msg_clr_eos_force();	/* Old command/ruler may still be there */
+	comp_col();
+	msg_row = Rows - 1;
+	msg_col = 0;	/* put position back at start of line */
+    }
+
+    /*
+     * make the new window the current window and redraw
+     */
+    if (do_equal || dir != 0)
+	win_equal(wp, TRUE,
+#ifdef FEAT_VERTSPLIT
+		(flags & WSP_VERT) ? (dir == 'v' ? 'b' : 'h')
+		: dir == 'h' ? 'b' :
+#endif
+		'v');
+
+    /* Don't change the window height/width to 'winheight' / 'winwidth' if a
+     * size was given. */
+#ifdef FEAT_VERTSPLIT
+    if (flags & WSP_VERT)
+    {
+	i = p_wiw;
+	if (size != 0)
+	    p_wiw = size;
+
+# ifdef FEAT_GUI
+	/* When 'guioptions' includes 'L' or 'R' may have to add scrollbars. */
+	if (gui.in_use)
+	    gui_init_which_components(NULL);
+# endif
+    }
+    else
+#endif
+    {
+	i = p_wh;
+	if (size != 0)
+	    p_wh = size;
+    }
+    win_enter(wp, FALSE);
+#ifdef FEAT_VERTSPLIT
+    if (flags & WSP_VERT)
+	p_wiw = i;
+    else
+#endif
+	p_wh = i;
+
+    return OK;
+}
+
+#endif /* FEAT_WINDOWS */
+
+#ifdef FEAT_VERTSPLIT
+/*
+ * Return minimal height for window "wp" and windows east of it.
+ * Takes into account the eastbound windws can be split, each of them
+ * requireing p_wmh lines.  Doesn't count status lines.
+ */
+    static int
+win_minheight(wp)
+    win_T	*wp;
+{
+    int		minheight = p_wmh;
+    int		n;
+    win_T	*wp1, *wp2;
+
+    wp1 = wp;
+    for (;;)
+    {
+	wp1 = wp1->w_next;
+	if (wp1 == NULL)
+	    break;
+	n = p_wmh;
+	wp2 = wp1;
+	for (;;)
+	{
+	    wp2 = wp2->w_next;
+	    if (wp2 == NULL)
+		break;
+	    n += win_minheight(wp2);
+	}
+	if (n > minheight)
+	    minheight = n;
+    }
+    return minheight;
+}
+
+#endif
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+/*
+ * Check if "win" is a pointer to an existing window.
+ */
+    int
+win_valid(win)
+    win_T	*win;
+{
+    win_T	*wp;
+
+    if (win == NULL)
+	return FALSE;
+    for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	if (wp == win)
+	    return TRUE;
+    return FALSE;
+}
+
+/*
+ * Return the number of windows.
+ */
+    int
+win_count()
+{
+    win_T	*wp;
+    int		count = 0;
+
+    for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	++count;
+    return count;
+}
+
+/*
+ * Make "count" windows on the screen.
+ * Return actual number of windows on the screen.
+ * Must be called when there is just one window, filling the whole screen
+ * (excluding the command line).
+ */
+/*ARGSUSED*/
+    int
+make_windows(count, vertical)
+    int		count;
+    int		vertical;	/* split windows vertically if TRUE */
+{
+    int		maxcount;
+    int		todo;
+
+#ifdef FEAT_VERTSPLIT
+    if (vertical)
+    {
+	/* Each windows needs at least 'winminwidth' lines and a separator
+	 * column. */
+	maxcount = (curwin->w_width + curwin->w_vsep_width
+					     - (p_wiw - p_wmw)) / (p_wmw + 1);
+    }
+    else
+#endif
+    {
+	/* Each window needs at least 'winminheight' lines and a status line. */
+	maxcount = (curwin->w_height + curwin->w_status_height
+				  - (p_wh - p_wmh)) / (p_wmh + STATUS_HEIGHT);
+    }
+
+    if (maxcount < 2)
+	maxcount = 2;
+    if (count > maxcount)
+	count = maxcount;
+
+    /*
+     * add status line now, otherwise first window will be too big
+     */
+    if (count > 1)
+	last_status(TRUE);
+
+#ifdef FEAT_AUTOCMD
+    /*
+     * Don't execute autocommands while creating the windows.  Must do that
+     * when putting the buffers in the windows.
+     */
+    ++autocmd_block;
+#endif
+
+    /* todo is number of windows left to create */
+    for (todo = count - 1; todo > 0; --todo)
+#ifdef FEAT_VERTSPLIT
+	if (vertical)
+	{
+	    if (win_split(curwin->w_width - (curwin->w_width - todo)
+			/ (todo + 1) - 1, WSP_VERT | WSP_ABOVE) == FAIL)
+		break;
+	}
+	else
+#endif
+	{
+	    if (win_split(curwin->w_height - (curwin->w_height - todo
+			    * STATUS_HEIGHT) / (todo + 1)
+			- STATUS_HEIGHT, WSP_ABOVE) == FAIL)
+		break;
+	}
+
+#ifdef FEAT_AUTOCMD
+    --autocmd_block;
+#endif
+
+    /* return actual number of windows */
+    return (count - todo);
+}
+
+/*
+ * Exchange current and next window
+ */
+    static void
+win_exchange(Prenum)
+    long	Prenum;
+{
+    frame_T	*frp;
+    frame_T	*frp2;
+    win_T	*wp;
+    win_T	*wp2;
+    int		temp;
+
+    if (lastwin == firstwin)	    /* just one window */
+    {
+	beep_flush();
+	return;
+    }
+
+#ifdef FEAT_GUI
+    need_mouse_correct = TRUE;
+#endif
+
+    /*
+     * find window to exchange with
+     */
+    if (Prenum)
+    {
+	frp = curwin->w_frame->fr_parent->fr_child;
+	while (frp != NULL && --Prenum > 0)
+	    frp = frp->fr_next;
+    }
+    else if (curwin->w_frame->fr_next != NULL)	/* Swap with next */
+	frp = curwin->w_frame->fr_next;
+    else    /* Swap last window in row/col with previous */
+	frp = curwin->w_frame->fr_prev;
+
+    /* We can only exchange a window with another window, not with a frame
+     * containing windows. */
+    if (frp == NULL || frp->fr_win == NULL || frp->fr_win == curwin)
+	return;
+    wp = frp->fr_win;
+
+/*
+ * 1. remove curwin from the list. Remember after which window it was in wp2
+ * 2. insert curwin before wp in the list
+ * if wp != wp2
+ *    3. remove wp from the list
+ *    4. insert wp after wp2
+ * 5. exchange the status line height and vsep width.
+ */
+    wp2 = curwin->w_prev;
+    frp2 = curwin->w_frame->fr_prev;
+    if (wp->w_prev != curwin)
+    {
+	win_remove(curwin);
+	frame_remove(curwin->w_frame);
+	win_append(wp->w_prev, curwin);
+	frame_insert(frp, curwin->w_frame);
+    }
+    if (wp != wp2)
+    {
+	win_remove(wp);
+	frame_remove(wp->w_frame);
+	win_append(wp2, wp);
+	if (frp2 == NULL)
+	    frame_insert(wp->w_frame->fr_parent->fr_child, wp->w_frame);
+	else
+	    frame_append(frp2, wp->w_frame);
+    }
+    temp = curwin->w_status_height;
+    curwin->w_status_height = wp->w_status_height;
+    wp->w_status_height = temp;
+#ifdef FEAT_VERTSPLIT
+    temp = curwin->w_vsep_width;
+    curwin->w_vsep_width = wp->w_vsep_width;
+    wp->w_vsep_width = temp;
+
+    /* If the windows are not in the same frame, exchange the sizes to avoid
+     * messing up the window layout.  Otherwise fix the frame sizes. */
+    if (curwin->w_frame->fr_parent != wp->w_frame->fr_parent)
+    {
+	temp = curwin->w_height;
+	curwin->w_height = wp->w_height;
+	wp->w_height = temp;
+	temp = curwin->w_width;
+	curwin->w_width = wp->w_width;
+	wp->w_width = temp;
+    }
+    else
+    {
+	frame_fix_height(curwin);
+	frame_fix_height(wp);
+	frame_fix_width(curwin);
+	frame_fix_width(wp);
+    }
+#endif
+
+    (void)win_comp_pos();		/* recompute window positions */
+
+    win_enter(wp, TRUE);
+    redraw_later(CLEAR);
+}
+
+/*
+ * rotate windows: if upwards TRUE the second window becomes the first one
+ *		   if upwards FALSE the first window becomes the second one
+ */
+    static void
+win_rotate(upwards, count)
+    int		upwards;
+    int		count;
+{
+    win_T	*wp1;
+    win_T	*wp2;
+    frame_T	*frp;
+    int		n;
+
+    if (firstwin == lastwin)		/* nothing to do */
+    {
+	beep_flush();
+	return;
+    }
+
+#ifdef FEAT_GUI
+    need_mouse_correct = TRUE;
+#endif
+
+#ifdef FEAT_VERTSPLIT
+    /* Check if all frames in this row/col have one window. */
+    for (frp = curwin->w_frame->fr_parent->fr_child; frp != NULL;
+							   frp = frp->fr_next)
+	if (frp->fr_win == NULL)
+	{
+	    EMSG(_("E443: Cannot rotate when another window is split"));
+	    return;
+	}
+#endif
+
+    while (count--)
+    {
+	if (upwards)		/* first window becomes last window */
+	{
+	    /* remove first window/frame from the list */
+	    frp = curwin->w_frame->fr_parent->fr_child;
+	    wp1 = frp->fr_win;
+	    win_remove(wp1);
+	    frame_remove(frp);
+
+	    /* find last frame and append removed window/frame after it */
+	    for ( ; frp->fr_next != NULL; frp = frp->fr_next)
+		;
+	    win_append(frp->fr_win, wp1);
+	    frame_append(frp, wp1->w_frame);
+
+	    wp2 = frp->fr_win;		/* previously last window */
+	}
+	else			/* last window becomes first window */
+	{
+	    /* find last window/frame in the list and remove it */
+	    for (frp = curwin->w_frame; frp->fr_next != NULL;
+							   frp = frp->fr_next)
+		;
+	    wp1 = frp->fr_win;
+	    wp2 = wp1->w_prev;		    /* will become last window */
+	    win_remove(wp1);
+	    frame_remove(frp);
+
+	    /* append the removed window/frame before the first in the list */
+	    win_append(frp->fr_parent->fr_child->fr_win->w_prev, wp1);
+	    frame_insert(frp->fr_parent->fr_child, frp);
+	}
+
+	/* exchange status height and vsep width of old and new last window */
+	n = wp2->w_status_height;
+	wp2->w_status_height = wp1->w_status_height;
+	wp1->w_status_height = n;
+	frame_fix_height(wp1);
+	frame_fix_height(wp2);
+#ifdef FEAT_VERTSPLIT
+	n = wp2->w_vsep_width;
+	wp2->w_vsep_width = wp1->w_vsep_width;
+	wp1->w_vsep_width = n;
+	frame_fix_width(wp1);
+	frame_fix_width(wp2);
+#endif
+
+	    /* recompute w_winrow and w_wincol for all windows */
+	(void)win_comp_pos();
+    }
+
+    redraw_later(CLEAR);
+}
+
+/*
+ * Move the current window to the very top/bottom/left/right of the screen.
+ */
+    static void
+win_totop(size, flags)
+    int		size;
+    int		flags;
+{
+    int		dir;
+    int		height = curwin->w_height;
+
+    if (lastwin == firstwin)
+    {
+	beep_flush();
+	return;
+    }
+
+    /* Remove the window and frame from the tree of frames. */
+    (void)winframe_remove(curwin, &dir);
+    win_remove(curwin);
+    last_status(FALSE);	    /* may need to remove last status line */
+    (void)win_comp_pos();   /* recompute window positions */
+
+    /* Split a window on the desired side and put the window there. */
+    (void)win_split_ins(size, flags, curwin, dir);
+    if (!(flags & WSP_VERT))
+    {
+	win_setheight(height);
+	if (p_ea)
+	    win_equal(curwin, TRUE, 'v');
+    }
+
+#if defined(FEAT_GUI) && defined(FEAT_VERTSPLIT)
+    /* When 'guioptions' includes 'L' or 'R' may have to remove or add
+     * scrollbars.  Have to update them anyway. */
+    if (gui.in_use)
+    {
+	out_flush();
+	gui_init_which_components(NULL);
+	gui_update_scrollbars(TRUE);
+    }
+    need_mouse_correct = TRUE;
+#endif
+
+}
+
+/*
+ * Move window "win1" to below/right of "win2" and make "win1" the current
+ * window.  Only works within the same frame!
+ */
+    void
+win_move_after(win1, win2)
+    win_T	*win1, *win2;
+{
+    int		height;
+
+    /* check if the arguments are reasonable */
+    if (win1 == win2)
+	return;
+
+    /* check if there is something to do */
+    if (win2->w_next != win1)
+    {
+	/* may need move the status line/vertical separator of the last window
+	 * */
+	if (win1 == lastwin)
+	{
+	    height = win1->w_prev->w_status_height;
+	    win1->w_prev->w_status_height = win1->w_status_height;
+	    win1->w_status_height = height;
+#ifdef FEAT_VERTSPLIT
+	    win1->w_prev->w_vsep_width = 0;
+	    win1->w_vsep_width = 1;
+#endif
+	}
+	else if (win2 == lastwin)
+	{
+	    height = win1->w_status_height;
+	    win1->w_status_height = win2->w_status_height;
+	    win2->w_status_height = height;
+#ifdef FEAT_VERTSPLIT
+	    win2->w_vsep_width = 1;
+	    win1->w_vsep_width = 0;
+#endif
+	}
+	win_remove(win1);
+	frame_remove(win1->w_frame);
+	win_append(win2, win1);
+	frame_append(win2->w_frame, win1->w_frame);
+
+	(void)win_comp_pos();	/* recompute w_winrow for all windows */
+	redraw_later(NOT_VALID);
+    }
+    win_enter(win1, FALSE);
+}
+
+/*
+ * Make all windows the same height.
+ * 'next_curwin' will soon be the current window, make sure it has enough
+ * rows.
+ */
+    void
+win_equal(next_curwin, current, dir)
+    win_T	*next_curwin;	/* pointer to current window to be or NULL */
+    int		current;	/* do only frame with current window */
+    int		dir;		/* 'v' for vertically, 'h' for horizontally,
+				   'b' for both, 0 for using p_ead */
+{
+    if (dir == 0)
+#ifdef FEAT_VERTSPLIT
+	dir = *p_ead;
+#else
+	dir = 'b';
+#endif
+    win_equal_rec(next_curwin == NULL ? curwin : next_curwin, current,
+		      topframe, dir, 0, 0, (int)Columns, topframe->fr_height);
+}
+
+/*
+ * Set a frame to a new position and height, spreading the available room
+ * equally over contained frames.
+ * The window "next_curwin" (if not NULL) should at least get the size from
+ * 'winheight' and 'winwidth' if possible.
+ */
+    static void
+win_equal_rec(next_curwin, current, topfr, dir, col, row, width, height)
+    win_T	*next_curwin;	/* pointer to current window to be or NULL */
+    int		current;	/* do only frame with current window */
+    frame_T	*topfr;		/* frame to set size off */
+    int		dir;		/* 'v', 'h' or 'b', see win_equal() */
+    int		col;		/* horizontal position for frame */
+    int		row;		/* vertical position for frame */
+    int		width;		/* new width of frame */
+    int		height;		/* new height of frame */
+{
+    int		n, m;
+    int		extra_sep = 0;
+    int		wincount, totwincount = 0;
+    frame_T	*fr;
+    int		next_curwin_size = 0;
+    int		room = 0;
+    int		new_size;
+    int		has_next_curwin = 0;
+    int		hnc;
+
+    if (topfr->fr_layout == FR_LEAF)
+    {
+	/* Set the width/height of this frame.
+	 * Redraw when size or position changes */
+	if (topfr->fr_height != height || topfr->fr_win->w_winrow != row
+#ifdef FEAT_VERTSPLIT
+		|| topfr->fr_width != width || topfr->fr_win->w_wincol != col
+#endif
+	   )
+	{
+	    topfr->fr_win->w_winrow = row;
+	    frame_new_height(topfr, height, FALSE, FALSE);
+#ifdef FEAT_VERTSPLIT
+	    topfr->fr_win->w_wincol = col;
+	    frame_new_width(topfr, width, FALSE);
+#endif
+	    redraw_all_later(CLEAR);
+	}
+    }
+#ifdef FEAT_VERTSPLIT
+    else if (topfr->fr_layout == FR_ROW)
+    {
+	topfr->fr_width = width;
+	topfr->fr_height = height;
+
+	if (dir != 'v')			/* equalize frame widths */
+	{
+	    /* Compute the maximum number of windows horizontally in this
+	     * frame. */
+	    n = frame_minwidth(topfr, NOWIN);
+	    /* add one for the rightmost window, it doesn't have a separator */
+	    if (col + width == Columns)
+		extra_sep = 1;
+	    else
+		extra_sep = 0;
+	    totwincount = (n + extra_sep) / (p_wmw + 1);
+
+	    /* Compute room available for windows other than "next_curwin" */
+	    m = frame_minwidth(topfr, next_curwin);
+	    room = width - m;
+	    if (room < 0)
+	    {
+		next_curwin_size = p_wiw + room;
+		room = 0;
+	    }
+	    else if (n == m)		/* doesn't contain curwin */
+		next_curwin_size = 0;
+	    else
+	    {
+		next_curwin_size = (room + p_wiw + (totwincount - 1) * p_wmw
+					   + (totwincount - 1)) / totwincount;
+		if (next_curwin_size  > p_wiw)
+		    room -= next_curwin_size - p_wiw;
+		else
+		    next_curwin_size = p_wiw;
+	    }
+	    if (n != m)
+		--totwincount;		/* don't count curwin */
+	}
+
+	for (fr = topfr->fr_child; fr != NULL; fr = fr->fr_next)
+	{
+	    n = m = 0;
+	    wincount = 1;
+	    if (fr->fr_next == NULL)
+		/* last frame gets all that remains (avoid roundoff error) */
+		new_size = width;
+	    else if (dir == 'v')
+		new_size = fr->fr_width;
+	    else
+	    {
+		/* Compute the maximum number of windows horiz. in "fr". */
+		n = frame_minwidth(fr, NOWIN);
+		wincount = (n + (fr->fr_next == NULL ? extra_sep : 0))
+								/ (p_wmw + 1);
+		m = frame_minwidth(fr, next_curwin);
+		if (n != m)	    /* don't count next_curwin */
+		    --wincount;
+		new_size = (wincount * room + ((unsigned)totwincount >> 1))
+								/ totwincount;
+		if (n != m)	    /* add next_curwin size */
+		{
+		    next_curwin_size -= p_wiw - (m - n);
+		    new_size += next_curwin_size;
+		}
+	    }
+
+	    /* Skip frame that is full height when splitting or closing a
+	     * window, unless equalizing all frames. */
+	    if (!current || dir != 'v' || topfr->fr_parent != NULL
+		    || (new_size != fr->fr_width)
+		    || frame_has_win(fr, next_curwin))
+		win_equal_rec(next_curwin, current, fr, dir, col, row,
+							new_size + n, height);
+	    col += new_size + n;
+	    width -= new_size + n;
+	    if (n != m)	    /* contains curwin */
+		room -= new_size - next_curwin_size;
+	    else
+		room -= new_size;
+	    totwincount -= wincount;
+	}
+    }
+#endif
+    else /* topfr->fr_layout == FR_COL */
+    {
+#ifdef FEAT_VERTSPLIT
+	topfr->fr_width = width;
+#endif
+	topfr->fr_height = height;
+
+	if (dir != 'h')			/* equalize frame heights */
+	{
+	    /* Compute maximum number of windows vertically in this frame. */
+	    n = frame_minheight(topfr, NOWIN);
+	    /* add one for the bottom window if it doesn't have a statusline */
+	    if (row + height == cmdline_row && p_ls == 0)
+		extra_sep = 1;
+	    else
+		extra_sep = 0;
+	    totwincount = (n + extra_sep) / (p_wmh + 1);
+	    has_next_curwin = frame_has_win(topfr, next_curwin);
+
+	    /*
+	     * Compute height for "next_curwin" window and room available for
+	     * other windows.
+	     * "m" is the minimal height when counting p_wh for "next_curwin".
+	     */
+	    m = frame_minheight(topfr, next_curwin);
+	    room = height - m;
+	    if (room < 0)
+	    {
+		/* The room is less then 'winheight', use all space for the
+		 * current window. */
+		next_curwin_size = p_wh + room;
+		room = 0;
+	    }
+	    else
+	    {
+		next_curwin_size = -1;
+		for (fr = topfr->fr_child; fr != NULL; fr = fr->fr_next)
+		{
+		    /* If 'winfixheight' set keep the window height if
+		     * possible.
+		     * Watch out for this window being the next_curwin. */
+		    if (frame_fixed_height(fr))
+		    {
+			n = frame_minheight(fr, NOWIN);
+			new_size = fr->fr_height;
+			if (frame_has_win(fr, next_curwin))
+			{
+			    room += p_wh - p_wmh;
+			    next_curwin_size = 0;
+			    if (new_size < p_wh)
+				new_size = p_wh;
+			}
+			else
+			    /* These windows don't use up room. */
+			    totwincount -= (n + (fr->fr_next == NULL
+					      ? extra_sep : 0)) / (p_wmh + 1);
+			room -= new_size - n;
+			if (room < 0)
+			{
+			    new_size += room;
+			    room = 0;
+			}
+			fr->fr_newheight = new_size;
+		    }
+		}
+		if (next_curwin_size == -1)
+		{
+		    if (!has_next_curwin)
+			next_curwin_size = 0;
+		    else if (totwincount > 1
+			    && (room + (totwincount - 2))
+						   / (totwincount - 1) > p_wh)
+		    {
+			next_curwin_size = (room + p_wh + totwincount * p_wmh
+					   + (totwincount - 1)) / totwincount;
+			room -= next_curwin_size - p_wh;
+		    }
+		    else
+			next_curwin_size = p_wh;
+		}
+	    }
+
+	    if (has_next_curwin)
+		--totwincount;		/* don't count curwin */
+	}
+
+	for (fr = topfr->fr_child; fr != NULL; fr = fr->fr_next)
+	{
+	    n = m = 0;
+	    wincount = 1;
+	    if (fr->fr_next == NULL)
+		/* last frame gets all that remains (avoid roundoff error) */
+		new_size = height;
+	    else if (dir == 'h')
+		new_size = fr->fr_height;
+	    else if (frame_fixed_height(fr))
+	    {
+		new_size = fr->fr_newheight;
+		wincount = 0;	    /* doesn't count as a sizeable window */
+	    }
+	    else
+	    {
+		/* Compute the maximum number of windows vert. in "fr". */
+		n = frame_minheight(fr, NOWIN);
+		wincount = (n + (fr->fr_next == NULL ? extra_sep : 0))
+								/ (p_wmh + 1);
+		m = frame_minheight(fr, next_curwin);
+		if (has_next_curwin)
+		    hnc = frame_has_win(fr, next_curwin);
+		else
+		    hnc = FALSE;
+		if (hnc)	    /* don't count next_curwin */
+		    --wincount;
+		if (totwincount == 0)
+		    new_size = room;
+		else
+		    new_size = (wincount * room + ((unsigned)totwincount >> 1))
+								/ totwincount;
+		if (hnc)	    /* add next_curwin size */
+		{
+		    next_curwin_size -= p_wh - (m - n);
+		    new_size += next_curwin_size;
+		    room -= new_size - next_curwin_size;
+		}
+		else
+		    room -= new_size;
+		new_size += n;
+	    }
+	    /* Skip frame that is full width when splitting or closing a
+	     * window, unless equalizing all frames. */
+	    if (!current || dir != 'h' || topfr->fr_parent != NULL
+		    || (new_size != fr->fr_height)
+		    || frame_has_win(fr, next_curwin))
+		win_equal_rec(next_curwin, current, fr, dir, col, row,
+							     width, new_size);
+	    row += new_size;
+	    height -= new_size;
+	    totwincount -= wincount;
+	}
+    }
+}
+
+/*
+ * close all windows for buffer 'buf'
+ */
+    void
+close_windows(buf)
+    buf_T	*buf;
+{
+    win_T	*win;
+
+    ++RedrawingDisabled;
+    for (win = firstwin; win != NULL && lastwin != firstwin; )
+    {
+	if (win->w_buffer == buf)
+	{
+	    win_close(win, FALSE);
+	    win = firstwin;	    /* go back to the start */
+	}
+	else
+	    win = win->w_next;
+    }
+    --RedrawingDisabled;
+}
+
+/*
+ * close window "win"
+ * If "free_buf" is TRUE related buffer may be unloaded.
+ *
+ * called by :quit, :close, :xit, :wq and findtag()
+ */
+    void
+win_close(win, free_buf)
+    win_T	*win;
+    int		free_buf;
+{
+    win_T	*wp;
+#ifdef FEAT_AUTOCMD
+    int		other_buffer = FALSE;
+#endif
+    int		close_curwin = FALSE;
+    frame_T	*frp;
+    int		dir;
+    int		help_window = FALSE;
+
+    if (lastwin == firstwin)
+    {
+	EMSG(_("E444: Cannot close last window"));
+	return;
+    }
+
+    /* When closing the help window, try restoring a snapshot after closing
+     * the window.  Otherwise clear the snapshot, it's now invalid. */
+    if (win->w_buffer->b_help)
+	help_window = TRUE;
+    else
+	clear_snapshot();
+
+#ifdef FEAT_AUTOCMD
+    if (win == curwin)
+    {
+	/*
+	 * Guess which window is going to be the new current window.
+	 * This may change because of the autocommands (sigh).
+	 */
+	wp = frame2win(win_altframe(win));
+
+	/*
+	 * Be careful: If autocommands delete the window, return now.
+	 */
+	if (wp->w_buffer != curbuf)
+	{
+	    other_buffer = TRUE;
+	    apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf);
+	    if (!win_valid(win) || firstwin == lastwin)
+		return;
+	}
+	apply_autocmds(EVENT_WINLEAVE, NULL, NULL, FALSE, curbuf);
+	if (!win_valid(win) || firstwin == lastwin)
+	    return;
+# ifdef FEAT_EVAL
+	/* autocmds may abort script processing */
+	if (aborting())
+	    return;
+# endif
+    }
+#endif
+
+    /*
+     * Close the link to the buffer.
+     */
+    close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0);
+    /* Autocommands may have closed the window already, or closed the only
+     * other window. */
+    if (!win_valid(win) || firstwin == lastwin)
+	return;
+
+    /* reduce the reference count to the argument list. */
+    alist_unlink(win->w_alist);
+
+    /* remove the window and its frame from the tree of frames. */
+    frp = win->w_frame;
+    wp = winframe_remove(win, &dir);
+    vim_free(frp);
+    win_free(win);
+
+    /* Make sure curwin isn't invalid.  It can cause severe trouble when
+     * printing an error message.  For win_equal() curbuf needs to be valid
+     * too. */
+    if (win == curwin)
+    {
+	curwin = wp;
+#ifdef FEAT_QUICKFIX
+	if (wp->w_p_pvw || bt_quickfix(wp->w_buffer))
+	{
+	    /*
+	     * The cursor goes to the preview or the quickfix window, try
+	     * finding another window to go to.
+	     */
+	    for (;;)
+	    {
+		if (wp->w_next == NULL)
+		    wp = firstwin;
+		else
+		    wp = wp->w_next;
+		if (wp == curwin)
+		    break;
+		if (!wp->w_p_pvw && !bt_quickfix(wp->w_buffer))
+		{
+		    curwin = wp;
+		    break;
+		}
+	    }
+	}
+#endif
+	curbuf = curwin->w_buffer;
+	close_curwin = TRUE;
+    }
+    if (p_ea)
+	win_equal(curwin, TRUE,
+#ifdef FEAT_VERTSPLIT
+		dir
+#else
+		0
+#endif
+		);
+    else
+	win_comp_pos();
+    if (close_curwin)
+    {
+	win_enter_ext(wp, FALSE, TRUE);
+#ifdef FEAT_AUTOCMD
+	if (other_buffer)
+	    /* careful: after this wp and win may be invalid! */
+	    apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
+#endif
+    }
+
+    /*
+     * if last window has a status line now and we don't want one,
+     * remove the status line
+     */
+    last_status(FALSE);
+
+    /* After closing the help window, try restoring the window layout from
+     * before it was opened. */
+    if (help_window)
+	restore_snapshot(close_curwin);
+
+#if defined(FEAT_GUI) && defined(FEAT_VERTSPLIT)
+    /* When 'guioptions' includes 'L' or 'R' may have to remove scrollbars. */
+    if (gui.in_use && !win_hasvertsplit())
+	gui_init_which_components(NULL);
+#endif
+
+    redraw_all_later(NOT_VALID);
+}
+
+/*
+ * Remove a window and its frame from the tree of frames.
+ * Returns a pointer to the window that got the freed up space.
+ */
+/*ARGSUSED*/
+    static win_T *
+winframe_remove(win, dirp)
+    win_T	*win;
+    int		*dirp;		/* set to 'v' or 'h' for direction if 'ea' */
+{
+    frame_T	*frp, *frp2, *frp3;
+    frame_T	*frp_close = win->w_frame;
+    win_T	*wp;
+    int		old_height = 0;
+
+    /*
+     * Remove the window from its frame.
+     */
+    frp2 = win_altframe(win);
+    wp = frame2win(frp2);
+
+    /* Remove this frame from the list of frames. */
+    frame_remove(frp_close);
+
+#ifdef FEAT_VERTSPLIT
+    if (frp_close->fr_parent->fr_layout == FR_COL)
+    {
+#endif
+	/* When 'winfixheight' is set, remember its old size and restore
+	 * it later (it's a simplistic solution...).  Don't do this if the
+	 * window will occupy the full height of the screen. */
+	if (frp2->fr_win != NULL
+		&& (frp2->fr_next != NULL || frp2->fr_prev != NULL)
+		&& frp2->fr_win->w_p_wfh)
+	    old_height = frp2->fr_win->w_height;
+	frame_new_height(frp2, frp2->fr_height + frp_close->fr_height,
+			    frp2 == frp_close->fr_next ? TRUE : FALSE, FALSE);
+	if (old_height != 0)
+	    win_setheight_win(old_height, frp2->fr_win);
+#ifdef FEAT_VERTSPLIT
+	*dirp = 'v';
+    }
+    else
+    {
+	frame_new_width(frp2, frp2->fr_width + frp_close->fr_width,
+				   frp2 == frp_close->fr_next ? TRUE : FALSE);
+	*dirp = 'h';
+    }
+#endif
+
+    /* If rows/columns go to a window below/right its positions need to be
+     * updated.  Can only be done after the sizes have been updated. */
+    if (frp2 == frp_close->fr_next)
+    {
+	int row = win->w_winrow;
+	int col = W_WINCOL(win);
+
+	frame_comp_pos(frp2, &row, &col);
+    }
+
+    if (frp2->fr_next == NULL && frp2->fr_prev == NULL)
+    {
+	/* There is no other frame in this list, move its info to the parent
+	 * and remove it. */
+	frp2->fr_parent->fr_layout = frp2->fr_layout;
+	frp2->fr_parent->fr_child = frp2->fr_child;
+	for (frp = frp2->fr_child; frp != NULL; frp = frp->fr_next)
+	    frp->fr_parent = frp2->fr_parent;
+	frp2->fr_parent->fr_win = frp2->fr_win;
+	if (frp2->fr_win != NULL)
+	    frp2->fr_win->w_frame = frp2->fr_parent;
+	frp = frp2->fr_parent;
+	vim_free(frp2);
+
+	frp2 = frp->fr_parent;
+	if (frp2 != NULL && frp2->fr_layout == frp->fr_layout)
+	{
+	    /* The frame above the parent has the same layout, have to merge
+	     * the frames into this list. */
+	    if (frp2->fr_child == frp)
+		frp2->fr_child = frp->fr_child;
+	    frp->fr_child->fr_prev = frp->fr_prev;
+	    if (frp->fr_prev != NULL)
+		frp->fr_prev->fr_next = frp->fr_child;
+	    for (frp3 = frp->fr_child; ; frp3 = frp3->fr_next)
+	    {
+		frp3->fr_parent = frp2;
+		if (frp3->fr_next == NULL)
+		{
+		    frp3->fr_next = frp->fr_next;
+		    if (frp->fr_next != NULL)
+			frp->fr_next->fr_prev = frp3;
+		    break;
+		}
+	    }
+	    vim_free(frp);
+	}
+    }
+
+    return wp;
+}
+
+/*
+ * Find out which frame is going to get the freed up space when "win" is
+ * closed.
+ * if 'splitbelow'/'splitleft' the space goes to the window above/left.
+ * if 'nosplitbelow'/'nosplitleft' the space goes to the window below/right.
+ * This makes opening a window and closing it immediately keep the same window
+ * layout.
+ */
+    static frame_T *
+win_altframe(win)
+    win_T	*win;
+{
+    frame_T	*frp;
+    int		b;
+
+    frp = win->w_frame;
+#ifdef FEAT_VERTSPLIT
+    if (frp->fr_parent->fr_layout == FR_ROW)
+	b = p_spr;
+    else
+#endif
+	b = p_sb;
+    if ((!b && frp->fr_next != NULL) || frp->fr_prev == NULL)
+	return frp->fr_next;
+    return frp->fr_prev;
+}
+
+/*
+ * Find the left-upper window in frame "frp".
+ */
+    static win_T *
+frame2win(frp)
+    frame_T	*frp;
+{
+    while (frp->fr_win == NULL)
+	frp = frp->fr_child;
+    return frp->fr_win;
+}
+
+/*
+ * Return TRUE if frame "frp" contains window "wp".
+ */
+    static int
+frame_has_win(frp, wp)
+    frame_T	*frp;
+    win_T	*wp;
+{
+    frame_T	*p;
+
+    if (frp->fr_layout == FR_LEAF)
+	return frp->fr_win == wp;
+
+    for (p = frp->fr_child; p != NULL; p = p->fr_next)
+	if (frame_has_win(p, wp))
+	    return TRUE;
+    return FALSE;
+}
+
+/*
+ * Set a new height for a frame.  Recursively sets the height for contained
+ * frames and windows.  Caller must take care of positions.
+ */
+    static void
+frame_new_height(topfrp, height, topfirst, wfh)
+    frame_T	*topfrp;
+    int		height;
+    int		topfirst;	/* resize topmost contained frame first */
+    int		wfh;		/* obey 'winfixheight' when there is a choice;
+				   may cause the height not to be set */
+{
+    frame_T	*frp;
+    int		extra_lines;
+    int		h;
+
+    if (topfrp->fr_win != NULL)
+    {
+	/* Simple case: just one window. */
+	win_new_height(topfrp->fr_win,
+				    height - topfrp->fr_win->w_status_height);
+    }
+#ifdef FEAT_VERTSPLIT
+    else if (topfrp->fr_layout == FR_ROW)
+    {
+	do
+	{
+	    /* All frames in this row get the same new height. */
+	    for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	    {
+		frame_new_height(frp, height, topfirst, wfh);
+		if (frp->fr_height > height)
+		{
+		    /* Could not fit the windows, make the whole row higher. */
+		    height = frp->fr_height;
+		    break;
+		}
+	    }
+	}
+	while (frp != NULL);
+    }
+#endif
+    else
+    {
+	/* Complicated case: Resize a column of frames.  Resize the bottom
+	 * frame first, frames above that when needed. */
+
+	frp = topfrp->fr_child;
+	if (wfh)
+	    /* Advance past frames with one window with 'wfh' set. */
+	    while (frame_fixed_height(frp))
+	    {
+		frp = frp->fr_next;
+		if (frp == NULL)
+		    return;	    /* no frame without 'wfh', give up */
+	    }
+	if (!topfirst)
+	{
+	    /* Find the bottom frame of this column */
+	    while (frp->fr_next != NULL)
+		frp = frp->fr_next;
+	    if (wfh)
+		/* Advance back for frames with one window with 'wfh' set. */
+		while (frame_fixed_height(frp))
+		    frp = frp->fr_prev;
+	}
+
+	extra_lines = height - topfrp->fr_height;
+	if (extra_lines < 0)
+	{
+	    /* reduce height of contained frames, bottom or top frame first */
+	    while (frp != NULL)
+	    {
+		h = frame_minheight(frp, NULL);
+		if (frp->fr_height + extra_lines < h)
+		{
+		    extra_lines += frp->fr_height - h;
+		    frame_new_height(frp, h, topfirst, wfh);
+		}
+		else
+		{
+		    frame_new_height(frp, frp->fr_height + extra_lines,
+							       topfirst, wfh);
+		    break;
+		}
+		if (topfirst)
+		{
+		    do
+			frp = frp->fr_next;
+		    while (wfh && frp != NULL && frame_fixed_height(frp));
+		}
+		else
+		{
+		    do
+			frp = frp->fr_prev;
+		    while (wfh && frp != NULL && frame_fixed_height(frp));
+		}
+		/* Increase "height" if we could not reduce enough frames. */
+		if (frp == NULL)
+		    height -= extra_lines;
+	    }
+	}
+	else if (extra_lines > 0)
+	{
+	    /* increase height of bottom or top frame */
+	    frame_new_height(frp, frp->fr_height + extra_lines, topfirst, wfh);
+	}
+    }
+    topfrp->fr_height = height;
+}
+
+/*
+ * Return TRUE if height of frame "frp" should not be changed because of
+ * the 'winfixheight' option.
+ */
+    static int
+frame_fixed_height(frp)
+    frame_T	*frp;
+{
+    /* frame with one window: fixed height if 'winfixheight' set. */
+    if (frp->fr_win != NULL)
+	return frp->fr_win->w_p_wfh;
+
+    if (frp->fr_layout == FR_ROW)
+    {
+	/* The frame is fixed height if one of the frames in the row is fixed
+	 * height. */
+	for (frp = frp->fr_child; frp != NULL; frp = frp->fr_next)
+	    if (frame_fixed_height(frp))
+		return TRUE;
+	return FALSE;
+    }
+
+    /* frp->fr_layout == FR_COL: The frame is fixed height if all of the
+     * frames in the row are fixed height. */
+    for (frp = frp->fr_child; frp != NULL; frp = frp->fr_next)
+	if (!frame_fixed_height(frp))
+	    return FALSE;
+    return TRUE;
+}
+
+#ifdef FEAT_VERTSPLIT
+/*
+ * Add a status line to windows at the bottom of "frp".
+ * Note: Does not check if there is room!
+ */
+    static void
+frame_add_statusline(frp)
+    frame_T	*frp;
+{
+    win_T	*wp;
+
+    if (frp->fr_layout == FR_LEAF)
+    {
+	wp = frp->fr_win;
+	if (wp->w_status_height == 0)
+	{
+	    if (wp->w_height > 0)	/* don't make it negative */
+		--wp->w_height;
+	    wp->w_status_height = STATUS_HEIGHT;
+	}
+    }
+    else if (frp->fr_layout == FR_ROW)
+    {
+	/* Handle all the frames in the row. */
+	for (frp = frp->fr_child; frp != NULL; frp = frp->fr_next)
+	    frame_add_statusline(frp);
+    }
+    else /* frp->fr_layout == FR_COL */
+    {
+	/* Only need to handle the last frame in the column. */
+	for (frp = frp->fr_child; frp->fr_next != NULL; frp = frp->fr_next)
+	    ;
+	frame_add_statusline(frp);
+    }
+}
+
+/*
+ * Set width of a frame.  Handles recursively going through contained frames.
+ * May remove separator line for windows at the right side (for win_close()).
+ */
+    static void
+frame_new_width(topfrp, width, leftfirst)
+    frame_T	*topfrp;
+    int		width;
+    int		leftfirst;	/* resize leftmost contained frame first */
+{
+    frame_T	*frp;
+    int		extra_cols;
+    int		w;
+    win_T	*wp;
+
+    if (topfrp->fr_layout == FR_LEAF)
+    {
+	/* Simple case: just one window. */
+	wp = topfrp->fr_win;
+	/* Find out if there are any windows right of this one. */
+	for (frp = topfrp; frp->fr_parent != NULL; frp = frp->fr_parent)
+	    if (frp->fr_parent->fr_layout == FR_ROW && frp->fr_next != NULL)
+		break;
+	if (frp->fr_parent == NULL)
+	    wp->w_vsep_width = 0;
+	win_new_width(wp, width - wp->w_vsep_width);
+    }
+    else if (topfrp->fr_layout == FR_COL)
+    {
+	/* All frames in this column get the same new width. */
+	for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	    frame_new_width(frp, width, leftfirst);
+    }
+    else    /* fr_layout == FR_ROW */
+    {
+	/* Complicated case: Resize a row of frames.  Resize the rightmost
+	 * frame first, frames left of it when needed. */
+
+	/* Find the rightmost frame of this row */
+	frp = topfrp->fr_child;
+	if (!leftfirst)
+	    while (frp->fr_next != NULL)
+		frp = frp->fr_next;
+
+	extra_cols = width - topfrp->fr_width;
+	if (extra_cols < 0)
+	{
+	    /* reduce frame width, rightmost frame first */
+	    while (frp != NULL)
+	    {
+		w = frame_minwidth(frp, NULL);
+		if (frp->fr_width + extra_cols < w)
+		{
+		    extra_cols += frp->fr_width - w;
+		    frame_new_width(frp, w, leftfirst);
+		}
+		else
+		{
+		    frame_new_width(frp, frp->fr_width + extra_cols, leftfirst);
+		    break;
+		}
+		if (leftfirst)
+		    frp = frp->fr_next;
+		else
+		    frp = frp->fr_prev;
+	    }
+	}
+	else if (extra_cols > 0)
+	{
+	    /* increase width of rightmost frame */
+	    frame_new_width(frp, frp->fr_width + extra_cols, leftfirst);
+	}
+    }
+    topfrp->fr_width = width;
+}
+
+/*
+ * Add the vertical separator to windows at the right side of "frp".
+ * Note: Does not check if there is room!
+ */
+    static void
+frame_add_vsep(frp)
+    frame_T	*frp;
+{
+    win_T	*wp;
+
+    if (frp->fr_layout == FR_LEAF)
+    {
+	wp = frp->fr_win;
+	if (wp->w_vsep_width == 0)
+	{
+	    if (wp->w_width > 0)	/* don't make it negative */
+		--wp->w_width;
+	    wp->w_vsep_width = 1;
+	}
+    }
+    else if (frp->fr_layout == FR_COL)
+    {
+	/* Handle all the frames in the column. */
+	for (frp = frp->fr_child; frp != NULL; frp = frp->fr_next)
+	    frame_add_vsep(frp);
+    }
+    else /* frp->fr_layout == FR_ROW */
+    {
+	/* Only need to handle the last frame in the row. */
+	frp = frp->fr_child;
+	while (frp->fr_next != NULL)
+	    frp = frp->fr_next;
+	frame_add_vsep(frp);
+    }
+}
+
+/*
+ * Set frame width from the window it contains.
+ */
+    static void
+frame_fix_width(wp)
+    win_T	*wp;
+{
+    wp->w_frame->fr_width = wp->w_width + wp->w_vsep_width;
+}
+#endif
+
+/*
+ * Set frame height from the window it contains.
+ */
+    static void
+frame_fix_height(wp)
+    win_T	*wp;
+{
+    wp->w_frame->fr_height = wp->w_height + wp->w_status_height;
+}
+
+/*
+ * Compute the minimal height for frame "topfrp".
+ * Uses the 'winminheight' option.
+ * When "next_curwin" isn't NULL, use p_wh for this window.
+ * When "next_curwin" is NOWIN, don't use at least one line for the current
+ * window.
+ */
+    static int
+frame_minheight(topfrp, next_curwin)
+    frame_T	*topfrp;
+    win_T	*next_curwin;
+{
+    frame_T	*frp;
+    int		m;
+#ifdef FEAT_VERTSPLIT
+    int		n;
+#endif
+
+    if (topfrp->fr_win != NULL)
+    {
+	if (topfrp->fr_win == next_curwin)
+	    m = p_wh + topfrp->fr_win->w_status_height;
+	else
+	{
+	    /* window: minimal height of the window plus status line */
+	    m = p_wmh + topfrp->fr_win->w_status_height;
+	    /* Current window is minimal one line high */
+	    if (p_wmh == 0 && topfrp->fr_win == curwin && next_curwin == NULL)
+		++m;
+	}
+    }
+#ifdef FEAT_VERTSPLIT
+    else if (topfrp->fr_layout == FR_ROW)
+    {
+	/* get the minimal height from each frame in this row */
+	m = 0;
+	for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	{
+	    n = frame_minheight(frp, next_curwin);
+	    if (n > m)
+		m = n;
+	}
+    }
+#endif
+    else
+    {
+	/* Add up the minimal heights for all frames in this column. */
+	m = 0;
+	for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	    m += frame_minheight(frp, next_curwin);
+    }
+
+    return m;
+}
+
+#ifdef FEAT_VERTSPLIT
+/*
+ * Compute the minimal width for frame "topfrp".
+ * When "next_curwin" isn't NULL, use p_wiw for this window.
+ * When "next_curwin" is NOWIN, don't use at least one column for the current
+ * window.
+ */
+    static int
+frame_minwidth(topfrp, next_curwin)
+    frame_T	*topfrp;
+    win_T	*next_curwin;	/* use p_wh and p_wiw for next_curwin */
+{
+    frame_T	*frp;
+    int		m, n;
+
+    if (topfrp->fr_win != NULL)
+    {
+	if (topfrp->fr_win == next_curwin)
+	    m = p_wiw + topfrp->fr_win->w_vsep_width;
+	else
+	{
+	    /* window: minimal width of the window plus separator column */
+	    m = p_wmw + topfrp->fr_win->w_vsep_width;
+	    /* Current window is minimal one column wide */
+	    if (p_wmw == 0 && topfrp->fr_win == curwin && next_curwin == NULL)
+		++m;
+	}
+    }
+    else if (topfrp->fr_layout == FR_COL)
+    {
+	/* get the minimal width from each frame in this column */
+	m = 0;
+	for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	{
+	    n = frame_minwidth(frp, next_curwin);
+	    if (n > m)
+		m = n;
+	}
+    }
+    else
+    {
+	/* Add up the minimal widths for all frames in this row. */
+	m = 0;
+	for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	    m += frame_minwidth(frp, next_curwin);
+    }
+
+    return m;
+}
+#endif
+
+
+/*
+ * Try to close all windows except current one.
+ * Buffers in the other windows become hidden if 'hidden' is set, or '!' is
+ * used and the buffer was modified.
+ *
+ * Used by ":bdel" and ":only".
+ */
+    void
+close_others(message, forceit)
+    int		message;
+    int		forceit;	    /* always hide all other windows */
+{
+    win_T	*wp;
+    win_T	*nextwp;
+    int		r;
+
+    if (lastwin == firstwin)
+    {
+	if (message
+#ifdef FEAT_AUTOCMD
+		    && !autocmd_busy
+#endif
+				    )
+	    MSG(_("Already only one window"));
+	return;
+    }
+
+    /* Be very careful here: autocommands may change the window layout. */
+    for (wp = firstwin; win_valid(wp); wp = nextwp)
+    {
+	nextwp = wp->w_next;
+	if (wp != curwin)		/* don't close current window */
+	{
+
+	    /* Check if it's allowed to abandon this window */
+	    r = can_abandon(wp->w_buffer, forceit);
+#ifdef FEAT_AUTOCMD
+	    if (!win_valid(wp))		/* autocommands messed wp up */
+	    {
+		nextwp = firstwin;
+		continue;
+	    }
+#endif
+	    if (!r)
+	    {
+#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
+		if (message && (p_confirm || cmdmod.confirm) && p_write)
+		{
+		    dialog_changed(wp->w_buffer, FALSE);
+# ifdef FEAT_AUTOCMD
+		    if (!win_valid(wp))		/* autocommands messed wp up */
+		    {
+			nextwp = firstwin;
+			continue;
+		    }
+# endif
+		}
+		if (bufIsChanged(wp->w_buffer))
+#endif
+		    continue;
+	    }
+	    win_close(wp, !P_HID(wp->w_buffer) && !bufIsChanged(wp->w_buffer));
+	}
+    }
+
+    /*
+     * If current window has a status line and we don't want one,
+     * remove the status line.
+     */
+    if (lastwin != firstwin)
+	EMSG(_("E445: Other window contains changes"));
+}
+
+#endif /* FEAT_WINDOWS */
+
+/*
+ * init the cursor in the window
+ *
+ * called when a new file is being edited
+ */
+    void
+win_init(wp)
+    win_T	*wp;
+{
+    redraw_win_later(wp, NOT_VALID);
+    wp->w_lines_valid = 0;
+    wp->w_cursor.lnum = 1;
+    wp->w_curswant = wp->w_cursor.col = 0;
+#ifdef FEAT_VIRTUALEDIT
+    wp->w_cursor.coladd = 0;
+#endif
+    wp->w_pcmark.lnum = 1;	/* pcmark not cleared but set to line 1 */
+    wp->w_pcmark.col = 0;
+    wp->w_prev_pcmark.lnum = 0;
+    wp->w_prev_pcmark.col = 0;
+    wp->w_topline = 1;
+#ifdef FEAT_DIFF
+    wp->w_topfill = 0;
+#endif
+    wp->w_botline = 2;
+#ifdef FEAT_FKMAP
+    if (curwin->w_p_rl)
+	wp->w_farsi = W_CONV + W_R_L;
+    else
+	wp->w_farsi = W_CONV;
+#endif
+}
+
+/*
+ * Allocate the first window and put an empty buffer in it.
+ * Called from main().
+ * When this fails we can't do anything: exit.
+ */
+    void
+win_alloc_first()
+{
+    curwin = win_alloc(NULL);
+    curbuf = buflist_new(NULL, NULL, 1L, BLN_LISTED);
+    if (curwin == NULL || curbuf == NULL)
+	mch_exit(0);
+    curwin->w_buffer = curbuf;
+    curbuf->b_nwindows = 1;	/* there is one window */
+#ifdef FEAT_WINDOWS
+    curwin->w_alist = &global_alist;
+#endif
+    win_init(curwin);		/* init current window */
+
+    topframe = (frame_T *)alloc_clear((unsigned)sizeof(frame_T));
+    if (topframe == NULL)
+	mch_exit(0);
+    topframe->fr_layout = FR_LEAF;
+#ifdef FEAT_VERTSPLIT
+    topframe->fr_width = Columns;
+#endif
+    topframe->fr_height = Rows - p_ch;
+    topframe->fr_win = curwin;
+    curwin->w_frame = topframe;
+}
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+
+/*
+ * Go to another window.
+ * When jumping to another buffer, stop Visual mode.  Do this before
+ * changing windows so we can yank the selection into the '*' register.
+ * When jumping to another window on the same buffer, adjust its cursor
+ * position to keep the same Visual area.
+ */
+    void
+win_goto(wp)
+    win_T	*wp;
+{
+#ifdef FEAT_CMDWIN
+    if (cmdwin_type != 0)
+    {
+	beep_flush();
+	return;
+    }
+#endif
+#ifdef FEAT_VISUAL
+    if (wp->w_buffer != curbuf)
+	reset_VIsual_and_resel();
+    else if (VIsual_active)
+	wp->w_cursor = curwin->w_cursor;
+#endif
+
+#ifdef FEAT_GUI
+    need_mouse_correct = TRUE;
+#endif
+    win_enter(wp, TRUE);
+}
+
+#if defined(FEAT_PERL) || defined(PROTO)
+/*
+ * Find window number "winnr" (counting top to bottom).
+ */
+    win_T *
+win_find_nr(winnr)
+    int		winnr;
+{
+    win_T	*wp;
+
+# ifdef FEAT_WINDOWS
+    for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	if (--winnr == 0)
+	    break;
+    return wp;
+# else
+    return curwin;
+# endif
+}
+#endif
+
+#ifdef FEAT_VERTSPLIT
+/*
+ * Move to window above or below "count" times.
+ */
+    static void
+win_goto_ver(up, count)
+    int		up;		/* TRUE to go to win above */
+    long	count;
+{
+    frame_T	*fr;
+    frame_T	*nfr;
+    frame_T	*foundfr;
+
+    foundfr = curwin->w_frame;
+    while (count--)
+    {
+	/*
+	 * First go upwards in the tree of frames until we find a upwards or
+	 * downwards neighbor.
+	 */
+	fr = foundfr;
+	for (;;)
+	{
+	    if (fr == topframe)
+		goto end;
+	    if (up)
+		nfr = fr->fr_prev;
+	    else
+		nfr = fr->fr_next;
+	    if (fr->fr_parent->fr_layout == FR_COL && nfr != NULL)
+		break;
+	    fr = fr->fr_parent;
+	}
+
+	/*
+	 * Now go downwards to find the bottom or top frame in it.
+	 */
+	for (;;)
+	{
+	    if (nfr->fr_layout == FR_LEAF)
+	    {
+		foundfr = nfr;
+		break;
+	    }
+	    fr = nfr->fr_child;
+	    if (nfr->fr_layout == FR_ROW)
+	    {
+		/* Find the frame at the cursor row. */
+		while (fr->fr_next != NULL
+			&& frame2win(fr)->w_wincol + fr->fr_width
+					 <= curwin->w_wincol + curwin->w_wcol)
+		    fr = fr->fr_next;
+	    }
+	    if (nfr->fr_layout == FR_COL && up)
+		while (fr->fr_next != NULL)
+		    fr = fr->fr_next;
+	    nfr = fr;
+	}
+    }
+end:
+    if (foundfr != NULL)
+	win_goto(foundfr->fr_win);
+}
+
+/*
+ * Move to left or right window.
+ */
+    static void
+win_goto_hor(left, count)
+    int		left;		/* TRUE to go to left win */
+    long	count;
+{
+    frame_T	*fr;
+    frame_T	*nfr;
+    frame_T	*foundfr;
+
+    foundfr = curwin->w_frame;
+    while (count--)
+    {
+	/*
+	 * First go upwards in the tree of frames until we find a left or
+	 * right neighbor.
+	 */
+	fr = foundfr;
+	for (;;)
+	{
+	    if (fr == topframe)
+		goto end;
+	    if (left)
+		nfr = fr->fr_prev;
+	    else
+		nfr = fr->fr_next;
+	    if (fr->fr_parent->fr_layout == FR_ROW && nfr != NULL)
+		break;
+	    fr = fr->fr_parent;
+	}
+
+	/*
+	 * Now go downwards to find the leftmost or rightmost frame in it.
+	 */
+	for (;;)
+	{
+	    if (nfr->fr_layout == FR_LEAF)
+	    {
+		foundfr = nfr;
+		break;
+	    }
+	    fr = nfr->fr_child;
+	    if (nfr->fr_layout == FR_COL)
+	    {
+		/* Find the frame at the cursor row. */
+		while (fr->fr_next != NULL
+			&& frame2win(fr)->w_winrow + fr->fr_height
+					 <= curwin->w_winrow + curwin->w_wrow)
+		    fr = fr->fr_next;
+	    }
+	    if (nfr->fr_layout == FR_ROW && left)
+		while (fr->fr_next != NULL)
+		    fr = fr->fr_next;
+	    nfr = fr;
+	}
+    }
+end:
+    if (foundfr != NULL)
+	win_goto(foundfr->fr_win);
+}
+#endif
+
+/*
+ * Make window "wp" the current window.
+ */
+    void
+win_enter(wp, undo_sync)
+    win_T	*wp;
+    int		undo_sync;
+{
+    win_enter_ext(wp, undo_sync, FALSE);
+}
+
+/*
+ * Make window wp the current window.
+ * Can be called with "curwin_invalid" TRUE, which means that curwin has just
+ * been closed and isn't valid.
+ */
+    static void
+win_enter_ext(wp, undo_sync, curwin_invalid)
+    win_T	*wp;
+    int		undo_sync;
+    int		curwin_invalid;
+{
+#ifdef FEAT_AUTOCMD
+    int		other_buffer = FALSE;
+#endif
+
+    if (wp == curwin && !curwin_invalid)	/* nothing to do */
+	return;
+
+#ifdef FEAT_AUTOCMD
+    if (!curwin_invalid)
+    {
+	/*
+	 * Be careful: If autocommands delete the window, return now.
+	 */
+	if (wp->w_buffer != curbuf)
+	{
+	    apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf);
+	    other_buffer = TRUE;
+	    if (!win_valid(wp))
+		return;
+	}
+	apply_autocmds(EVENT_WINLEAVE, NULL, NULL, FALSE, curbuf);
+	if (!win_valid(wp))
+	    return;
+# ifdef FEAT_EVAL
+	/* autocmds may abort script processing */
+	if (aborting())
+	    return;
+# endif
+    }
+#endif
+
+    /* sync undo before leaving the current buffer */
+    if (undo_sync && curbuf != wp->w_buffer)
+	u_sync();
+    /* may have to copy the buffer options when 'cpo' contains 'S' */
+    if (wp->w_buffer != curbuf)
+	buf_copy_options(wp->w_buffer, BCO_ENTER | BCO_NOHELP);
+    if (!curwin_invalid)
+    {
+	prevwin = curwin;	/* remember for CTRL-W p */
+	curwin->w_redr_status = TRUE;
+    }
+    curwin = wp;
+    curbuf = wp->w_buffer;
+    check_cursor();
+#ifdef FEAT_VIRTUALEDIT
+    if (!virtual_active())
+	curwin->w_cursor.coladd = 0;
+#endif
+    changed_line_abv_curs();	/* assume cursor position needs updating */
+
+    if (curwin->w_localdir != NULL)
+    {
+	/* Window has a local directory: Save current directory as global
+	 * directory (unless that was done already) and change to the local
+	 * directory. */
+	if (globaldir == NULL)
+	{
+	    char_u	cwd[MAXPATHL];
+
+	    if (mch_dirname(cwd, MAXPATHL) == OK)
+		globaldir = vim_strsave(cwd);
+	}
+	mch_chdir((char *)curwin->w_localdir);
+	shorten_fnames(TRUE);
+    }
+    else if (globaldir != NULL)
+    {
+	/* Window doesn't have a local directory and we are not in the global
+	 * directory: Change to the global directory. */
+	mch_chdir((char *)globaldir);
+	vim_free(globaldir);
+	globaldir = NULL;
+	shorten_fnames(TRUE);
+    }
+
+#ifdef FEAT_AUTOCMD
+    apply_autocmds(EVENT_WINENTER, NULL, NULL, FALSE, curbuf);
+    if (other_buffer)
+	apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
+#endif
+
+#ifdef FEAT_TITLE
+    maketitle();
+#endif
+    curwin->w_redr_status = TRUE;
+    if (restart_edit)
+	redraw_later(VALID);	/* causes status line redraw */
+
+    /* set window height to desired minimal value */
+    if (curwin->w_height < p_wh && !curwin->w_p_wfh)
+	win_setheight((int)p_wh);
+    else if (curwin->w_height == 0)
+	win_setheight(1);
+
+#ifdef FEAT_VERTSPLIT
+    /* set window width to desired minimal value */
+    if (curwin->w_width < p_wiw)
+	win_setwidth((int)p_wiw);
+#endif
+
+#ifdef FEAT_MOUSE
+    setmouse();			/* in case jumped to/from help buffer */
+#endif
+
+#if defined(FEAT_NETBEANS_INTG) || defined(FEAT_SUN_WORKSHOP)
+    /* Change directories when the acd option is set on and after
+     * switching windows. */
+    if (p_acd && curbuf->b_ffname != NULL
+				     && vim_chdirfile(curbuf->b_ffname) == OK)
+	shorten_fnames(TRUE);
+#endif
+}
+
+#endif /* FEAT_WINDOWS */
+
+#if defined(FEAT_WINDOWS) || defined(FEAT_SIGNS) || defined(PROTO)
+/*
+ * Jump to the first open window that contains buffer buf if one exists
+ * TODO: Alternatively jump to last open window? Dependent from 'splitbelow'?
+ * Returns pointer to window if it exists, otherwise NULL.
+ */
+    win_T *
+buf_jump_open_win(buf)
+    buf_T	*buf;
+{
+# ifdef FEAT_WINDOWS
+    win_T	*wp;
+
+    for (wp = firstwin; wp; wp = wp->w_next)
+	if (wp->w_buffer == buf)
+	    break;
+    if (wp != NULL)
+	win_enter(wp, FALSE);
+    return wp;
+# else
+    if (curwin->w_buffer == buf)
+	return curwin;
+    return NULL;
+# endif
+}
+#endif
+
+/*
+ * allocate a window structure and link it in the window list
+ */
+/*ARGSUSED*/
+    static win_T *
+win_alloc(after)
+    win_T	*after;
+{
+    win_T	*newwin;
+
+    /*
+     * allocate window structure and linesizes arrays
+     */
+    newwin = (win_T *)alloc_clear((unsigned)sizeof(win_T));
+    if (newwin != NULL && win_alloc_lines(newwin) == FAIL)
+    {
+	vim_free(newwin);
+	newwin = NULL;
+    }
+
+    if (newwin != NULL)
+    {
+	/*
+	 * link the window in the window list
+	 */
+#ifdef FEAT_WINDOWS
+	win_append(after, newwin);
+#endif
+#ifdef FEAT_VERTSPLIT
+	newwin->w_wincol = 0;
+	newwin->w_width = Columns;
+#endif
+
+	/* position the display and the cursor at the top of the file. */
+	newwin->w_topline = 1;
+#ifdef FEAT_DIFF
+	newwin->w_topfill = 0;
+#endif
+	newwin->w_botline = 2;
+	newwin->w_cursor.lnum = 1;
+#ifdef FEAT_SCROLLBIND
+	newwin->w_scbind_pos = 1;
+#endif
+
+	/* We won't calculate w_fraction until resizing the window */
+	newwin->w_fraction = 0;
+	newwin->w_prev_fraction_row = -1;
+
+#ifdef FEAT_GUI
+	if (gui.in_use)
+	{
+	    out_flush();
+	    gui_create_scrollbar(&newwin->w_scrollbars[SBAR_LEFT],
+		    SBAR_LEFT, newwin);
+	    gui_create_scrollbar(&newwin->w_scrollbars[SBAR_RIGHT],
+		    SBAR_RIGHT, newwin);
+	}
+#endif
+#ifdef FEAT_EVAL
+	var_init(&newwin->w_vars);	    /* init internal variables */
+#endif
+#ifdef FEAT_FOLDING
+	foldInitWin(newwin);
+#endif
+    }
+    return newwin;
+}
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+
+/*
+ * remove window 'wp' from the window list and free the structure
+ */
+    static void
+win_free(wp)
+    win_T	*wp;
+{
+    int		i;
+
+#ifdef FEAT_PERL
+    perl_win_free(wp);
+#endif
+
+#ifdef FEAT_PYTHON
+    python_window_free(wp);
+#endif
+
+#ifdef FEAT_TCL
+    tcl_window_free(wp);
+#endif
+
+#ifdef FEAT_RUBY
+    ruby_window_free(wp);
+#endif
+
+    clear_winopt(&wp->w_onebuf_opt);
+    clear_winopt(&wp->w_allbuf_opt);
+
+#ifdef FEAT_EVAL
+    var_clear(&wp->w_vars);	    /* free all internal variables */
+#endif
+
+    if (prevwin == wp)
+	prevwin = NULL;
+    win_free_lsize(wp);
+
+    for (i = 0; i < wp->w_tagstacklen; ++i)
+	vim_free(wp->w_tagstack[i].tagname);
+
+    vim_free(wp->w_localdir);
+#ifdef FEAT_SEARCH_EXTRA
+    vim_free(wp->w_match.regprog);
+#endif
+#ifdef FEAT_JUMPLIST
+    free_jumplist(wp);
+#endif
+
+#ifdef FEAT_GUI
+    if (gui.in_use)
+    {
+	out_flush();
+	gui_mch_destroy_scrollbar(&wp->w_scrollbars[SBAR_LEFT]);
+	gui_mch_destroy_scrollbar(&wp->w_scrollbars[SBAR_RIGHT]);
+    }
+#endif /* FEAT_GUI */
+
+    win_remove(wp);
+    vim_free(wp);
+}
+
+/*
+ * Append window "wp" in the window list after window "after".
+ */
+    static void
+win_append(after, wp)
+    win_T	*after, *wp;
+{
+    win_T	*before;
+
+    if (after == NULL)	    /* after NULL is in front of the first */
+	before = firstwin;
+    else
+	before = after->w_next;
+
+    wp->w_next = before;
+    wp->w_prev = after;
+    if (after == NULL)
+	firstwin = wp;
+    else
+	after->w_next = wp;
+    if (before == NULL)
+	lastwin = wp;
+    else
+	before->w_prev = wp;
+}
+
+/*
+ * Remove a window from the window list.
+ */
+    static void
+win_remove(wp)
+    win_T	*wp;
+{
+    if (wp->w_prev != NULL)
+	wp->w_prev->w_next = wp->w_next;
+    else
+	firstwin = wp->w_next;
+    if (wp->w_next != NULL)
+	wp->w_next->w_prev = wp->w_prev;
+    else
+	lastwin = wp->w_prev;
+}
+
+/*
+ * Append frame "frp" in a frame list after frame "after".
+ */
+    static void
+frame_append(after, frp)
+    frame_T	*after, *frp;
+{
+    frp->fr_next = after->fr_next;
+    after->fr_next = frp;
+    if (frp->fr_next != NULL)
+	frp->fr_next->fr_prev = frp;
+    frp->fr_prev = after;
+}
+
+/*
+ * Insert frame "frp" in a frame list before frame "before".
+ */
+    static void
+frame_insert(before, frp)
+    frame_T	*before, *frp;
+{
+    frp->fr_next = before;
+    frp->fr_prev = before->fr_prev;
+    before->fr_prev = frp;
+    if (frp->fr_prev != NULL)
+	frp->fr_prev->fr_next = frp;
+    else
+	frp->fr_parent->fr_child = frp;
+}
+
+/*
+ * Remove a frame from a frame list.
+ */
+    static void
+frame_remove(frp)
+    frame_T	*frp;
+{
+    if (frp->fr_prev != NULL)
+	frp->fr_prev->fr_next = frp->fr_next;
+    else
+	frp->fr_parent->fr_child = frp->fr_next;
+    if (frp->fr_next != NULL)
+	frp->fr_next->fr_prev = frp->fr_prev;
+}
+
+#endif /* FEAT_WINDOWS */
+
+/*
+ * Allocate w_lines[] for window "wp".
+ * Return FAIL for failure, OK for success.
+ */
+    int
+win_alloc_lines(wp)
+    win_T	*wp;
+{
+    wp->w_lines_valid = 0;
+    wp->w_lines = (wline_T *)alloc((unsigned)(Rows * sizeof(wline_T)));
+    if (wp->w_lines == NULL)
+	return FAIL;
+    return OK;
+}
+
+/*
+ * free lsize arrays for a window
+ */
+    void
+win_free_lsize(wp)
+    win_T	*wp;
+{
+    vim_free(wp->w_lines);
+    wp->w_lines = NULL;
+}
+
+/*
+ * Called from win_new_shellsize() after Rows changed.
+ */
+    void
+shell_new_rows()
+{
+    int		h = (int)(Rows - p_ch);
+
+    if (firstwin == NULL)	/* not initialized yet */
+	return;
+#ifdef FEAT_WINDOWS
+    if (h < frame_minheight(topframe, NULL))
+	h = frame_minheight(topframe, NULL);
+    /* First try setting the heights of windows without 'winfixheight'.  If
+     * that doesn't result in the right height, forget about that option. */
+    frame_new_height(topframe, h, FALSE, TRUE);
+    if (topframe->fr_height != h)
+	frame_new_height(topframe, h, FALSE, FALSE);
+
+    (void)win_comp_pos();		/* recompute w_winrow and w_wincol */
+#else
+    if (h < 1)
+	h = 1;
+    win_new_height(firstwin, h);
+#endif
+    compute_cmdrow();
+#if 0
+    /* Disabled: don't want making the screen smaller make a window larger. */
+    if (p_ea)
+	win_equal(curwin, FALSE, 'v');
+#endif
+}
+
+#if defined(FEAT_VERTSPLIT) || defined(PROTO)
+/*
+ * Called from win_new_shellsize() after Columns changed.
+ */
+    void
+shell_new_columns()
+{
+    if (firstwin == NULL)	/* not initialized yet */
+	return;
+    frame_new_width(topframe, (int)Columns, FALSE);
+    (void)win_comp_pos();		/* recompute w_winrow and w_wincol */
+#if 0
+    /* Disabled: don't want making the screen smaller make a window larger. */
+    if (p_ea)
+	win_equal(curwin, FALSE, 'h');
+#endif
+}
+#endif
+
+#if defined(FEAT_CMDWIN) || defined(PROTO)
+/*
+ * Save the size of all windows in "gap".
+ */
+    void
+win_size_save(gap)
+    garray_T	*gap;
+
+{
+    win_T	*wp;
+
+    ga_init2(gap, (int)sizeof(int), 1);
+    if (ga_grow(gap, win_count() * 2) == OK)
+	for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	{
+	    ((int *)gap->ga_data)[gap->ga_len++] =
+					       wp->w_width + wp->w_vsep_width;
+	    ((int *)gap->ga_data)[gap->ga_len++] = wp->w_height;
+	}
+}
+
+/*
+ * Restore window sizes, but only if the number of windows is still the same.
+ * Does not free the growarray.
+ */
+    void
+win_size_restore(gap)
+    garray_T	*gap;
+{
+    win_T	*wp;
+    int		i;
+
+    if (win_count() * 2 == gap->ga_len)
+    {
+	i = 0;
+	for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	{
+	    frame_setwidth(wp->w_frame, ((int *)gap->ga_data)[i++]);
+	    win_setheight_win(((int *)gap->ga_data)[i++], wp);
+	}
+	/* recompute the window positions */
+	(void)win_comp_pos();
+    }
+}
+#endif /* FEAT_CMDWIN */
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+/*
+ * Update the position for all windows, using the width and height of the
+ * frames.
+ * Returns the row just after the last window.
+ */
+    static int
+win_comp_pos()
+{
+    int		row = 0;
+    int		col = 0;
+
+    frame_comp_pos(topframe, &row, &col);
+    return row;
+}
+
+/*
+ * Update the position of the windows in frame "topfrp", using the width and
+ * height of the frames.
+ * "*row" and "*col" are the top-left position of the frame.  They are updated
+ * to the bottom-right position plus one.
+ */
+    static void
+frame_comp_pos(topfrp, row, col)
+    frame_T	*topfrp;
+    int		*row;
+    int		*col;
+{
+    win_T	*wp;
+    frame_T	*frp;
+#ifdef FEAT_VERTSPLIT
+    int		startcol;
+    int		startrow;
+#endif
+
+    wp = topfrp->fr_win;
+    if (wp != NULL)
+    {
+	if (wp->w_winrow != *row
+#ifdef FEAT_VERTSPLIT
+		|| wp->w_wincol != *col
+#endif
+		)
+	{
+	    /* position changed, redraw */
+	    wp->w_winrow = *row;
+#ifdef FEAT_VERTSPLIT
+	    wp->w_wincol = *col;
+#endif
+	    redraw_win_later(wp, NOT_VALID);
+	    wp->w_redr_status = TRUE;
+	}
+	*row += wp->w_height + wp->w_status_height;
+#ifdef FEAT_VERTSPLIT
+	*col += wp->w_width + wp->w_vsep_width;
+#endif
+    }
+    else
+    {
+#ifdef FEAT_VERTSPLIT
+	startrow = *row;
+	startcol = *col;
+#endif
+	for (frp = topfrp->fr_child; frp != NULL; frp = frp->fr_next)
+	{
+#ifdef FEAT_VERTSPLIT
+	    if (topfrp->fr_layout == FR_ROW)
+		*row = startrow;	/* all frames are at the same row */
+	    else
+		*col = startcol;	/* all frames are at the same col */
+#endif
+	    frame_comp_pos(frp, row, col);
+	}
+    }
+}
+
+#endif /* FEAT_WINDOWS */
+
+/*
+ * Set current window height and take care of repositioning other windows to
+ * fit around it.
+ */
+    void
+win_setheight(height)
+    int		height;
+{
+    win_setheight_win(height, curwin);
+}
+
+/*
+ * Set the window height of window "win" and take care of repositioning other
+ * windows to fit around it.
+ */
+    void
+win_setheight_win(height, win)
+    int		height;
+    win_T	*win;
+{
+    int		row;
+
+    if (win == curwin)
+    {
+	/* Always keep current window at least one line high, even when
+	 * 'winminheight' is zero. */
+#ifdef FEAT_WINDOWS
+	if (height < p_wmh)
+	    height = p_wmh;
+#endif
+	if (height == 0)
+	    height = 1;
+    }
+
+#ifdef FEAT_WINDOWS
+    frame_setheight(win->w_frame, height + win->w_status_height);
+
+    /* recompute the window positions */
+    row = win_comp_pos();
+#else
+    if (height > topframe->fr_height)
+	height = topframe->fr_height;
+    win->w_height = height;
+    row = height;
+#endif
+
+    /*
+     * If there is extra space created between the last window and the command
+     * line, clear it.
+     */
+    if (full_screen && msg_scrolled == 0 && row < cmdline_row)
+	screen_fill(row, cmdline_row, 0, (int)Columns, ' ', ' ', 0);
+    cmdline_row = row;
+    msg_row = row;
+    msg_col = 0;
+
+    redraw_all_later(NOT_VALID);
+}
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+
+/*
+ * Set the height of a frame to "height" and take care that all frames and
+ * windows inside it are resized.  Also resize frames on the left and right if
+ * the are in the same FR_ROW frame.
+ *
+ * Strategy:
+ * If the frame is part of a FR_COL frame, try fitting the frame in that
+ * frame.  If that doesn't work (the FR_COL frame is too small), recursively
+ * go to containing frames to resize them and make room.
+ * If the frame is part of a FR_ROW frame, all frames must be resized as well.
+ * Check for the minimal height of the FR_ROW frame.
+ * At the top level we can also use change the command line height.
+ */
+    static void
+frame_setheight(curfrp, height)
+    frame_T	*curfrp;
+    int		height;
+{
+    int		room;		/* total number of lines available */
+    int		take;		/* number of lines taken from other windows */
+    int		room_cmdline;	/* lines available from cmdline */
+    int		run;
+    frame_T	*frp;
+    int		h;
+    int		room_reserved;
+
+    /* If the height already is the desired value, nothing to do. */
+    if (curfrp->fr_height == height)
+	return;
+
+    if (curfrp->fr_parent == NULL)
+    {
+	/* topframe: can only change the command line */
+	if (height > Rows - p_ch)
+	    height = Rows - p_ch;
+	if (height > 0)
+	    frame_new_height(curfrp, height, FALSE, FALSE);
+    }
+    else if (curfrp->fr_parent->fr_layout == FR_ROW)
+    {
+	/* Row of frames: Also need to resize frames left and right of this
+	 * one.  First check for the minimal height of these. */
+	h = frame_minheight(curfrp->fr_parent, NULL);
+	if (height < h)
+	    height = h;
+	frame_setheight(curfrp->fr_parent, height);
+    }
+    else
+    {
+	/*
+	 * Column of frames: try to change only frames in this column.
+	 */
+#ifdef FEAT_VERTSPLIT
+	/*
+	 * Do this twice:
+	 * 1: compute room available, if it's not enough try resizing the
+	 *    containing frame.
+	 * 2: compute the room available and adjust the height to it.
+	 * Try not to reduce the height of a window with 'winfixheight' set.
+	 */
+	for (run = 1; run <= 2; ++run)
+#else
+	for (;;)
+#endif
+	{
+	    room = 0;
+	    room_reserved = 0;
+	    for (frp = curfrp->fr_parent->fr_child; frp != NULL;
+							   frp = frp->fr_next)
+	    {
+		if (frp != curfrp
+			&& frp->fr_win != NULL
+			&& frp->fr_win->w_p_wfh)
+		    room_reserved += frp->fr_height;
+		room += frp->fr_height;
+		if (frp != curfrp)
+		    room -= frame_minheight(frp, NULL);
+	    }
+#ifdef FEAT_VERTSPLIT
+	    if (curfrp->fr_width != Columns)
+		room_cmdline = 0;
+	    else
+#endif
+	    {
+		room_cmdline = Rows - p_ch - (lastwin->w_winrow
+			       + lastwin->w_height + lastwin->w_status_height);
+		if (room_cmdline < 0)
+		    room_cmdline = 0;
+	    }
+
+	    if (height <= room + room_cmdline)
+		break;
+#ifdef FEAT_VERTSPLIT
+	    if (run == 2 || curfrp->fr_width == Columns)
+#endif
+	    {
+		if (height > room + room_cmdline)
+		    height = room + room_cmdline;
+		break;
+	    }
+#ifdef FEAT_VERTSPLIT
+	    frame_setheight(curfrp->fr_parent, height
+		+ frame_minheight(curfrp->fr_parent, NOWIN) - (int)p_wmh - 1);
+#endif
+	    /*NOTREACHED*/
+	}
+
+	/*
+	 * Compute the number of lines we will take from others frames (can be
+	 * negative!).
+	 */
+	take = height - curfrp->fr_height;
+
+	/* If there is not enough room, also reduce the height of a window
+	 * with 'winfixheight' set. */
+	if (height > room + room_cmdline - room_reserved)
+	    room_reserved = room + room_cmdline - height;
+	/* If there is only a 'winfixheight' window and making the
+	 * window smaller, need to make the other window taller. */
+	if (take < 0 && room - curfrp->fr_height < room_reserved)
+	    room_reserved = 0;
+
+	if (take > 0 && room_cmdline > 0)
+	{
+	    /* use lines from cmdline first */
+	    if (take < room_cmdline)
+		room_cmdline = take;
+	    take -= room_cmdline;
+	    topframe->fr_height += room_cmdline;
+	}
+
+	/*
+	 * set the current frame to the new height
+	 */
+	frame_new_height(curfrp, height, FALSE, FALSE);
+
+	/*
+	 * First take lines from the frames after the current frame.  If
+	 * that is not enough, takes lines from frames above the current
+	 * frame.
+	 */
+	for (run = 0; run < 2; ++run)
+	{
+	    if (run == 0)
+		frp = curfrp->fr_next;	/* 1st run: start with next window */
+	    else
+		frp = curfrp->fr_prev;	/* 2nd run: start with prev window */
+	    while (frp != NULL && take != 0)
+	    {
+		h = frame_minheight(frp, NULL);
+		if (room_reserved > 0
+			&& frp->fr_win != NULL
+			&& frp->fr_win->w_p_wfh)
+		{
+		    if (room_reserved >= frp->fr_height)
+			room_reserved -= frp->fr_height;
+		    else
+		    {
+			if (frp->fr_height - room_reserved > take)
+			    room_reserved = frp->fr_height - take;
+			take -= frp->fr_height - room_reserved;
+			frame_new_height(frp, room_reserved, FALSE, FALSE);
+			room_reserved = 0;
+		    }
+		}
+		else
+		{
+		    if (frp->fr_height - take < h)
+		    {
+			take -= frp->fr_height - h;
+			frame_new_height(frp, h, FALSE, FALSE);
+		    }
+		    else
+		    {
+			frame_new_height(frp, frp->fr_height - take,
+								FALSE, FALSE);
+			take = 0;
+		    }
+		}
+		if (run == 0)
+		    frp = frp->fr_next;
+		else
+		    frp = frp->fr_prev;
+	    }
+	}
+    }
+}
+
+#if defined(FEAT_VERTSPLIT) || defined(PROTO)
+/*
+ * Set current window width and take care of repositioning other windows to
+ * fit around it.
+ */
+    void
+win_setwidth(width)
+    int		width;
+{
+    win_setwidth_win(width, curwin);
+}
+
+    void
+win_setwidth_win(width, wp)
+    int		width;
+    win_T	*wp;
+{
+    /* Always keep current window at least one column wide, even when
+     * 'winminwidth' is zero. */
+    if (wp == curwin)
+    {
+	if (width < p_wmw)
+	    width = p_wmw;
+	if (width == 0)
+	    width = 1;
+    }
+
+    frame_setwidth(wp->w_frame, width + wp->w_vsep_width);
+
+    /* recompute the window positions */
+    (void)win_comp_pos();
+
+    redraw_all_later(NOT_VALID);
+}
+
+/*
+ * Set the width of a frame to "width" and take care that all frames and
+ * windows inside it are resized.  Also resize frames above and below if the
+ * are in the same FR_ROW frame.
+ *
+ * Strategy is similar to frame_setheight().
+ */
+    static void
+frame_setwidth(curfrp, width)
+    frame_T	*curfrp;
+    int		width;
+{
+    int		room;		/* total number of lines available */
+    int		take;		/* number of lines taken from other windows */
+    int		run;
+    frame_T	*frp;
+    int		w;
+
+    /* If the width already is the desired value, nothing to do. */
+    if (curfrp->fr_width == width)
+	return;
+
+    if (curfrp->fr_parent == NULL)
+	/* topframe: can't change width */
+	return;
+
+    if (curfrp->fr_parent->fr_layout == FR_COL)
+    {
+	/* Column of frames: Also need to resize frames above and below of
+	 * this one.  First check for the minimal width of these. */
+	w = frame_minwidth(curfrp->fr_parent, NULL);
+	if (width < w)
+	    width = w;
+	frame_setwidth(curfrp->fr_parent, width);
+    }
+    else
+    {
+	/*
+	 * Row of frames: try to change only frames in this row.
+	 *
+	 * Do this twice:
+	 * 1: compute room available, if it's not enough try resizing the
+	 *    containing frame.
+	 * 2: compute the room available and adjust the width to it.
+	 */
+	for (run = 1; run <= 2; ++run)
+	{
+	    room = 0;
+	    for (frp = curfrp->fr_parent->fr_child; frp != NULL;
+							   frp = frp->fr_next)
+	    {
+		room += frp->fr_width;
+		if (frp != curfrp)
+		    room -= frame_minwidth(frp, NULL);
+	    }
+
+	    if (width <= room)
+		break;
+	    if (run == 2 || curfrp->fr_height >= Rows - p_ch)
+	    {
+		if (width > room)
+		    width = room;
+		break;
+	    }
+	    frame_setwidth(curfrp->fr_parent, width
+		 + frame_minwidth(curfrp->fr_parent, NOWIN) - (int)p_wmw - 1);
+	}
+
+
+	/*
+	 * Compute the number of lines we will take from others frames (can be
+	 * negative!).
+	 */
+	take = width - curfrp->fr_width;
+
+	/*
+	 * set the current frame to the new width
+	 */
+	frame_new_width(curfrp, width, FALSE);
+
+	/*
+	 * First take lines from the frames right of the current frame.  If
+	 * that is not enough, takes lines from frames left of the current
+	 * frame.
+	 */
+	for (run = 0; run < 2; ++run)
+	{
+	    if (run == 0)
+		frp = curfrp->fr_next;	/* 1st run: start with next window */
+	    else
+		frp = curfrp->fr_prev;	/* 2nd run: start with prev window */
+	    while (frp != NULL && take != 0)
+	    {
+		w = frame_minwidth(frp, NULL);
+		if (frp->fr_width - take < w)
+		{
+		    take -= frp->fr_width - w;
+		    frame_new_width(frp, w, FALSE);
+		}
+		else
+		{
+		    frame_new_width(frp, frp->fr_width - take, FALSE);
+		    take = 0;
+		}
+		if (run == 0)
+		    frp = frp->fr_next;
+		else
+		    frp = frp->fr_prev;
+	    }
+	}
+    }
+}
+#endif /* FEAT_VERTSPLIT */
+
+/*
+ * Check 'winminheight' for a valid value.
+ */
+    void
+win_setminheight()
+{
+    int		room;
+    int		first = TRUE;
+    win_T	*wp;
+
+    /* loop until there is a 'winminheight' that is possible */
+    while (p_wmh > 0)
+    {
+	/* TODO: handle vertical splits */
+	room = -p_wh;
+	for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	    room += wp->w_height - p_wmh;
+	if (room >= 0)
+	    break;
+	--p_wmh;
+	if (first)
+	{
+	    EMSG(_(e_noroom));
+	    first = FALSE;
+	}
+    }
+}
+
+#ifdef FEAT_MOUSE
+
+/*
+ * Status line of dragwin is dragged "offset" lines down (negative is up).
+ */
+    void
+win_drag_status_line(dragwin, offset)
+    win_T	*dragwin;
+    int		offset;
+{
+    frame_T	*curfr;
+    frame_T	*fr;
+    int		room;
+    int		row;
+    int		up;	/* if TRUE, drag status line up, otherwise down */
+    int		n;
+
+    fr = dragwin->w_frame;
+    curfr = fr;
+    if (fr != topframe)		/* more than one window */
+    {
+	fr = fr->fr_parent;
+	/* When the parent frame is not a column of frames, its parent should
+	 * be. */
+	if (fr->fr_layout != FR_COL)
+	{
+	    curfr = fr;
+	    if (fr != topframe)	/* only a row of windows, may drag statusline */
+		fr = fr->fr_parent;
+	}
+    }
+
+    /* If this is the last frame in a column, may want to resize the parent
+     * frame instead (go two up to skip a row of frames). */
+    while (curfr != topframe && curfr->fr_next == NULL)
+    {
+	if (fr != topframe)
+	    fr = fr->fr_parent;
+	curfr = fr;
+	if (fr != topframe)
+	    fr = fr->fr_parent;
+    }
+
+    if (offset < 0) /* drag up */
+    {
+	up = TRUE;
+	offset = -offset;
+	/* sum up the room of the current frame and above it */
+	if (fr == curfr)
+	{
+	    /* only one window */
+	    room = fr->fr_height - frame_minheight(fr, NULL);
+	}
+	else
+	{
+	    room = 0;
+	    for (fr = fr->fr_child; ; fr = fr->fr_next)
+	    {
+		room += fr->fr_height - frame_minheight(fr, NULL);
+		if (fr == curfr)
+		    break;
+	    }
+	}
+	fr = curfr->fr_next;		/* put fr at frame that grows */
+    }
+    else    /* drag down */
+    {
+	up = FALSE;
+	/*
+	 * Only dragging the last status line can reduce p_ch.
+	 */
+	room = Rows - cmdline_row;
+	if (curfr->fr_next == NULL)
+	    room -= 1;
+	else
+	    room -= p_ch;
+	if (room < 0)
+	    room = 0;
+	/* sum up the room of frames below of the current one */
+	for (fr = curfr->fr_next; fr != NULL; fr = fr->fr_next)
+	    room += fr->fr_height - frame_minheight(fr, NULL);
+	fr = curfr;			/* put fr at window that grows */
+    }
+
+    if (room < offset)		/* Not enough room */
+	offset = room;		/* Move as far as we can */
+    if (offset <= 0)
+	return;
+
+    /*
+     * Grow frame fr by "offset" lines.
+     * Doesn't happen when dragging the last status line up.
+     */
+    if (fr != NULL)
+	frame_new_height(fr, fr->fr_height + offset, up, FALSE);
+
+    if (up)
+	fr = curfr;		/* current frame gets smaller */
+    else
+	fr = curfr->fr_next;	/* next frame gets smaller */
+
+    /*
+     * Now make the other frames smaller.
+     */
+    while (fr != NULL && offset > 0)
+    {
+	n = frame_minheight(fr, NULL);
+	if (fr->fr_height - offset <= n)
+	{
+	    offset -= fr->fr_height - n;
+	    frame_new_height(fr, n, !up, FALSE);
+	}
+	else
+	{
+	    frame_new_height(fr, fr->fr_height - offset, !up, FALSE);
+	    break;
+	}
+	if (up)
+	    fr = fr->fr_prev;
+	else
+	    fr = fr->fr_next;
+    }
+    row = win_comp_pos();
+    screen_fill(row, cmdline_row, 0, (int)Columns, ' ', ' ', 0);
+    cmdline_row = row;
+    p_ch = Rows - cmdline_row;
+    if (p_ch < 1)
+	p_ch = 1;
+    redraw_all_later(NOT_VALID);
+    showmode();
+}
+
+#ifdef FEAT_VERTSPLIT
+/*
+ * Separator line of dragwin is dragged "offset" lines right (negative is left).
+ */
+    void
+win_drag_vsep_line(dragwin, offset)
+    win_T	*dragwin;
+    int		offset;
+{
+    frame_T	*curfr;
+    frame_T	*fr;
+    int		room;
+    int		left;	/* if TRUE, drag separator line left, otherwise right */
+    int		n;
+
+    fr = dragwin->w_frame;
+    if (fr == topframe)		/* only one window (cannot happe?) */
+	return;
+    curfr = fr;
+    fr = fr->fr_parent;
+    /* When the parent frame is not a row of frames, its parent should be. */
+    if (fr->fr_layout != FR_ROW)
+    {
+	if (fr == topframe)	/* only a column of windows (cannot happen?) */
+	    return;
+	curfr = fr;
+	fr = fr->fr_parent;
+    }
+
+    /* If this is the last frame in a row, may want to resize a parent
+     * frame instead. */
+    while (curfr->fr_next == NULL)
+    {
+	if (fr == topframe)
+	    break;
+	curfr = fr;
+	fr = fr->fr_parent;
+	if (fr != topframe)
+	{
+	    curfr = fr;
+	    fr = fr->fr_parent;
+	}
+    }
+
+    if (offset < 0) /* drag left */
+    {
+	left = TRUE;
+	offset = -offset;
+	/* sum up the room of the current frame and left of it */
+	room = 0;
+	for (fr = fr->fr_child; ; fr = fr->fr_next)
+	{
+	    room += fr->fr_width - frame_minwidth(fr, NULL);
+	    if (fr == curfr)
+		break;
+	}
+	fr = curfr->fr_next;		/* put fr at frame that grows */
+    }
+    else    /* drag right */
+    {
+	left = FALSE;
+	/* sum up the room of frames right of the current one */
+	room = 0;
+	for (fr = curfr->fr_next; fr != NULL; fr = fr->fr_next)
+	    room += fr->fr_width - frame_minwidth(fr, NULL);
+	fr = curfr;			/* put fr at window that grows */
+    }
+
+    if (room < offset)		/* Not enough room */
+	offset = room;		/* Move as far as we can */
+    if (offset <= 0)		/* No room at all, quit. */
+	return;
+
+    /* grow frame fr by offset lines */
+    frame_new_width(fr, fr->fr_width + offset, left);
+
+    /* shrink other frames: current and at the left or at the right */
+    if (left)
+	fr = curfr;		/* current frame gets smaller */
+    else
+	fr = curfr->fr_next;	/* next frame gets smaller */
+
+    while (fr != NULL && offset > 0)
+    {
+	n = frame_minwidth(fr, NULL);
+	if (fr->fr_width - offset <= n)
+	{
+	    offset -= fr->fr_width - n;
+	    frame_new_width(fr, n, !left);
+	}
+	else
+	{
+	    frame_new_width(fr, fr->fr_width - offset, !left);
+	    break;
+	}
+	if (left)
+	    fr = fr->fr_prev;
+	else
+	    fr = fr->fr_next;
+    }
+    (void)win_comp_pos();
+    redraw_all_later(NOT_VALID);
+}
+#endif /* FEAT_VERTSPLIT */
+#endif /* FEAT_MOUSE */
+
+#endif /* FEAT_WINDOWS */
+
+/*
+ * Set the height of a window.
+ * This takes care of the things inside the window, not what happens to the
+ * window position, the frame or to other windows.
+ */
+    static void
+win_new_height(wp, height)
+    win_T	*wp;
+    int		height;
+{
+    linenr_T	lnum;
+    int		sline, line_size;
+#define FRACTION_MULT	16384L
+
+    /* Don't want a negative height.  Happens when splitting a tiny window.
+     * Will equalize heights soon to fix it. */
+    if (height < 0)
+	height = 0;
+
+    if (wp->w_wrow != wp->w_prev_fraction_row && wp->w_height > 0)
+	wp->w_fraction = ((long)wp->w_wrow * FRACTION_MULT
+				    + FRACTION_MULT / 2) / (long)wp->w_height;
+
+    wp->w_height = height;
+    wp->w_skipcol = 0;
+
+    /* Don't change w_topline when height is zero.  Don't set w_topline when
+     * 'scrollbind' is set and this isn't the current window. */
+    if (height > 0
+#ifdef FEAT_SCROLLBIND
+	    && (!wp->w_p_scb || wp == curwin)
+#endif
+       )
+    {
+	lnum = wp->w_cursor.lnum;
+	if (lnum < 1)		/* can happen when starting up */
+	    lnum = 1;
+	wp->w_wrow = ((long)wp->w_fraction * (long)height - 1L) / FRACTION_MULT;
+	line_size = plines_win_col(wp, lnum, (long)(wp->w_cursor.col)) - 1;
+	sline = wp->w_wrow - line_size;
+	if (sline < 0)
+	{
+	    /*
+	     * Cursor line would go off top of screen if w_wrow was this high.
+	     */
+	    wp->w_wrow = line_size;
+	}
+	else
+	{
+	    while (sline > 0 && lnum > 1)
+	    {
+#ifdef FEAT_FOLDING
+		hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL);
+		if (lnum == 1)
+		{
+		    /* first line in buffer is folded */
+		    line_size = 1;
+		    --sline;
+		    break;
+		}
+#endif
+		--lnum;
+#ifdef FEAT_DIFF
+		if (lnum == wp->w_topline)
+		    line_size = plines_win_nofill(wp, lnum, TRUE)
+							      + wp->w_topfill;
+		else
+#endif
+		    line_size = plines_win(wp, lnum, TRUE);
+		sline -= line_size;
+	    }
+	    if (sline < 0)
+	    {
+		/*
+		 * Line we want at top would go off top of screen.  Use next
+		 * line instead.
+		 */
+#ifdef FEAT_FOLDING
+		hasFoldingWin(wp, lnum, NULL, &lnum, TRUE, NULL);
+#endif
+		lnum++;
+		wp->w_wrow -= line_size + sline;
+	    }
+	    else if (sline > 0)
+	    {
+		/* First line of file reached, use that as topline. */
+		lnum = 1;
+		wp->w_wrow -= sline;
+	    }
+	}
+	set_topline(wp, lnum);
+    }
+
+    if (wp == curwin)
+    {
+	if (p_so)
+	    update_topline();
+	curs_columns(FALSE);	/* validate w_wrow */
+    }
+    wp->w_prev_fraction_row = wp->w_wrow;
+
+    win_comp_scroll(wp);
+    redraw_win_later(wp, NOT_VALID);
+#ifdef FEAT_WINDOWS
+    wp->w_redr_status = TRUE;
+#endif
+    invalidate_botline_win(wp);
+}
+
+#ifdef FEAT_VERTSPLIT
+/*
+ * Set the width of a window.
+ */
+    static void
+win_new_width(wp, width)
+    win_T	*wp;
+    int		width;
+{
+    wp->w_width = width;
+    wp->w_lines_valid = 0;
+    changed_line_abv_curs_win(wp);
+    invalidate_botline_win(wp);
+    if (wp == curwin)
+    {
+	update_topline();
+	curs_columns(TRUE);	/* validate w_wrow */
+    }
+    redraw_win_later(wp, NOT_VALID);
+    wp->w_redr_status = TRUE;
+}
+#endif
+
+    void
+win_comp_scroll(wp)
+    win_T	*wp;
+{
+    wp->w_p_scr = ((unsigned)wp->w_height >> 1);
+    if (wp->w_p_scr == 0)
+	wp->w_p_scr = 1;
+}
+
+/*
+ * command_height: called whenever p_ch has been changed
+ */
+    void
+command_height(old_p_ch)
+    long	old_p_ch;
+{
+#ifdef FEAT_WINDOWS
+    int		h;
+    frame_T	*frp;
+
+    /* Find bottom frame with width of screen. */
+    frp = lastwin->w_frame;
+# ifdef FEAT_VERTSPLIT
+    while (frp->fr_width != Columns && frp->fr_parent != NULL)
+	frp = frp->fr_parent;
+# endif
+
+    /* Avoid changing the height of a window with 'winfixheight' set. */
+    while (frp->fr_prev != NULL && frp->fr_layout == FR_LEAF
+						      && frp->fr_win->w_p_wfh)
+	frp = frp->fr_prev;
+
+    if (starting != NO_SCREEN)
+    {
+	cmdline_row = Rows - p_ch;
+
+	if (p_ch > old_p_ch)		    /* p_ch got bigger */
+	{
+	    while (p_ch > old_p_ch)
+	    {
+		if (frp == NULL)
+		{
+		    EMSG(_(e_noroom));
+		    p_ch = old_p_ch;
+		    cmdline_row = Rows - p_ch;
+		    break;
+		}
+		h = frp->fr_height - frame_minheight(frp, NULL);
+		if (h > p_ch - old_p_ch)
+		    h = p_ch - old_p_ch;
+		old_p_ch += h;
+		frame_add_height(frp, -h);
+		frp = frp->fr_prev;
+	    }
+
+	    /* Recompute window positions. */
+	    (void)win_comp_pos();
+
+	    /* clear the lines added to cmdline */
+	    if (full_screen)
+		screen_fill((int)(cmdline_row), (int)Rows, 0,
+						   (int)Columns, ' ', ' ', 0);
+	    msg_row = cmdline_row;
+	    redraw_cmdline = TRUE;
+	    return;
+	}
+
+	if (msg_row < cmdline_row)
+	    msg_row = cmdline_row;
+	redraw_cmdline = TRUE;
+    }
+    frame_add_height(frp, (int)(old_p_ch - p_ch));
+
+    /* Recompute window positions. */
+    if (frp != lastwin->w_frame)
+	(void)win_comp_pos();
+#else
+    win_setheight((int)(firstwin->w_height + old_p_ch - p_ch));
+    cmdline_row = Rows - p_ch;
+#endif
+}
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+/*
+ * Resize frame "frp" to be "n" lines higher (negative for less high).
+ * Also resize the frames it is contained in.
+ */
+    static void
+frame_add_height(frp, n)
+    frame_T	*frp;
+    int		n;
+{
+    frame_new_height(frp, frp->fr_height + n, FALSE, FALSE);
+    for (;;)
+    {
+	frp = frp->fr_parent;
+	if (frp == NULL)
+	    break;
+	frp->fr_height += n;
+    }
+}
+
+/*
+ * Add or remove a status line for the bottom window(s), according to the
+ * value of 'laststatus'.
+ */
+    void
+last_status(morewin)
+    int		morewin;	/* pretend there are two or more windows */
+{
+    /* Don't make a difference between horizontal or vertical split. */
+    last_status_rec(topframe, (p_ls == 2
+			  || (p_ls == 1 && (morewin || lastwin != firstwin))));
+}
+
+    static void
+last_status_rec(fr, statusline)
+    frame_T	*fr;
+    int		statusline;
+{
+    frame_T	*fp;
+    win_T	*wp;
+
+    if (fr->fr_layout == FR_LEAF)
+    {
+	wp = fr->fr_win;
+	if (wp->w_status_height != 0 && !statusline)
+	{
+	    /* remove status line */
+	    win_new_height(wp, wp->w_height + 1);
+	    wp->w_status_height = 0;
+	    comp_col();
+	}
+	else if (wp->w_status_height == 0 && statusline)
+	{
+	    /* Find a frame to take a line from. */
+	    fp = fr;
+	    while (fp->fr_height <= frame_minheight(fp, NULL))
+	    {
+		if (fp == topframe)
+		{
+		    EMSG(_(e_noroom));
+		    return;
+		}
+		/* In a column of frames: go to frame above.  If already at
+		 * the top or in a row of frames: go to parent. */
+		if (fp->fr_parent->fr_layout == FR_COL && fp->fr_prev != NULL)
+		    fp = fp->fr_prev;
+		else
+		    fp = fp->fr_parent;
+	    }
+	    wp->w_status_height = 1;
+	    if (fp != fr)
+	    {
+		frame_new_height(fp, fp->fr_height - 1, FALSE, FALSE);
+		frame_fix_height(wp);
+		(void)win_comp_pos();
+	    }
+	    else
+		win_new_height(wp, wp->w_height - 1);
+	    comp_col();
+	    redraw_all_later(NOT_VALID);
+	}
+    }
+#ifdef FEAT_VERTSPLIT
+    else if (fr->fr_layout == FR_ROW)
+    {
+	/* vertically split windows, set status line for each one */
+	for (fp = fr->fr_child; fp != NULL; fp = fp->fr_next)
+	    last_status_rec(fp, statusline);
+    }
+#endif
+    else
+    {
+	/* horizontally split window, set status line for last one */
+	for (fp = fr->fr_child; fp->fr_next != NULL; fp = fp->fr_next)
+	    ;
+	last_status_rec(fp, statusline);
+    }
+}
+
+#endif /* FEAT_WINDOWS */
+
+#if defined(FEAT_SEARCHPATH) || defined(PROTO)
+/*
+ * Return the file name under or after the cursor.
+ *
+ * The 'path' option is searched if the file name is not absolute.
+ * The string returned has been alloc'ed and should be freed by the caller.
+ * NULL is returned if the file name or file is not found.
+ *
+ * options:
+ * FNAME_MESS	    give error messages
+ * FNAME_EXP	    expand to path
+ * FNAME_HYP	    check for hypertext link
+ * FNAME_INCL	    apply "includeexpr"
+ */
+    char_u *
+file_name_at_cursor(options, count)
+    int	    options;
+    long    count;
+{
+    return file_name_in_line(ml_get_curline(),
+		      curwin->w_cursor.col, options, count, curbuf->b_ffname);
+}
+
+/*
+ * Return the name of the file under or after ptr[col].
+ * Otherwise like file_name_at_cursor().
+ */
+    char_u *
+file_name_in_line(line, col, options, count, rel_fname)
+    char_u	*line;
+    int		col;
+    int		options;
+    long	count;
+    char_u	*rel_fname;	/* file we are searching relative to */
+{
+    char_u	*ptr;
+    int		len;
+
+    /*
+     * search forward for what could be the start of a file name
+     */
+    ptr = line + col;
+    while (*ptr != NUL && !vim_isfilec(*ptr))
+	++ptr;
+    if (*ptr == NUL)		/* nothing found */
+    {
+	if (options & FNAME_MESS)
+	    EMSG(_("E446: No file name under cursor"));
+	return NULL;
+    }
+
+    /*
+     * Search backward for first char of the file name.
+     * Go one char back to ":" before "//" even when ':' is not in 'isfname'.
+     */
+    while (ptr > line)
+    {
+#ifdef FEAT_MBYTE
+	if (has_mbyte && (len = (*mb_head_off)(line, ptr - 1)) > 0)
+	    ptr -= len + 1;
+	else
+#endif
+	if (vim_isfilec(ptr[-1])
+		|| ((options & FNAME_HYP) && path_is_url(ptr - 1)))
+	    --ptr;
+	else
+	    break;
+    }
+
+    /*
+     * Search forward for the last char of the file name.
+     * Also allow "://" when ':' is not in 'isfname'.
+     */
+    len = 0;
+    while (vim_isfilec(ptr[len])
+			 || ((options & FNAME_HYP) && path_is_url(ptr + len)))
+#ifdef FEAT_MBYTE
+	if (has_mbyte)
+	    len += (*mb_ptr2len_check)(ptr + len);
+	else
+#endif
+	    ++len;
+
+    /*
+     * If there is trailing punctuation, remove it.
+     * But don't remove "..", could be a directory name.
+     */
+    if (len > 2 && vim_strchr((char_u *)".,:;!", ptr[len - 1]) != NULL
+						       && ptr[len - 2] != '.')
+	--len;
+
+    return find_file_name_in_path(ptr, len, options, count, rel_fname);
+}
+
+# if defined(FEAT_FIND_ID) && defined(FEAT_EVAL)
+static char_u *eval_includeexpr __ARGS((char_u *ptr, int len));
+
+    static char_u *
+eval_includeexpr(ptr, len)
+    char_u	*ptr;
+    int		len;
+{
+    char_u	*res;
+
+    set_vim_var_string(VV_FNAME, ptr, len);
+    res = eval_to_string_safe(curbuf->b_p_inex, NULL);
+    set_vim_var_string(VV_FNAME, NULL, 0);
+    return res;
+}
+#endif
+
+/*
+ * Return the name of the file ptr[len] in 'path'.
+ * Otherwise like file_name_at_cursor().
+ */
+    char_u *
+find_file_name_in_path(ptr, len, options, count, rel_fname)
+    char_u	*ptr;
+    int		len;
+    int		options;
+    long	count;
+    char_u	*rel_fname;	/* file we are searching relative to */
+{
+    char_u	*file_name;
+    int		c;
+# if defined(FEAT_FIND_ID) && defined(FEAT_EVAL)
+    char_u	*tofree = NULL;
+
+    if ((options & FNAME_INCL) && *curbuf->b_p_inex != NUL)
+    {
+	tofree = eval_includeexpr(ptr, len);
+	if (tofree != NULL)
+	{
+	    ptr = tofree;
+	    len = (int)STRLEN(ptr);
+	}
+    }
+# endif
+
+    if (options & FNAME_EXP)
+    {
+	file_name = find_file_in_path(ptr, len, options & ~FNAME_MESS,
+							     TRUE, rel_fname);
+
+# if defined(FEAT_FIND_ID) && defined(FEAT_EVAL)
+	/*
+	 * If the file could not be found in a normal way, try applying
+	 * 'includeexpr' (unless done already).
+	 */
+	if (file_name == NULL
+		&& !(options & FNAME_INCL) && *curbuf->b_p_inex != NUL)
+	{
+	    tofree = eval_includeexpr(ptr, len);
+	    if (tofree != NULL)
+	    {
+		ptr = tofree;
+		len = (int)STRLEN(ptr);
+		file_name = find_file_in_path(ptr, len, options & ~FNAME_MESS,
+							     TRUE, rel_fname);
+	    }
+	}
+# endif
+	if (file_name == NULL && (options & FNAME_MESS))
+	{
+	    c = ptr[len];
+	    ptr[len] = NUL;
+	    EMSG2(_("E447: Can't find file \"%s\" in path"), ptr);
+	    ptr[len] = c;
+	}
+
+	/* Repeat finding the file "count" times.  This matters when it
+	 * appears several times in the path. */
+	while (file_name != NULL && --count > 0)
+	{
+	    vim_free(file_name);
+	    file_name = find_file_in_path(ptr, len, options, FALSE, rel_fname);
+	}
+    }
+    else
+	file_name = vim_strnsave(ptr, len);
+
+# if defined(FEAT_FIND_ID) && defined(FEAT_EVAL)
+    vim_free(tofree);
+# endif
+
+    return file_name;
+}
+#endif /* FEAT_SEARCHPATH */
+
+/*
+ * Check if the "://" of a URL is at the pointer, return URL_SLASH.
+ * Also check for ":\\", which MS Internet Explorer accepts, return
+ * URL_BACKSLASH.
+ */
+    static int
+path_is_url(p)
+    char_u  *p;
+{
+    if (STRNCMP(p, "://", (size_t)3) == 0)
+	return URL_SLASH;
+    else if (STRNCMP(p, ":\\\\", (size_t)3) == 0)
+	return URL_BACKSLASH;
+    return 0;
+}
+
+/*
+ * Check if "fname" starts with "name://".  Return URL_SLASH if it does.
+ * Return URL_BACKSLASH for "name:\\".
+ * Return zero otherwise.
+ */
+    int
+path_with_url(fname)
+    char_u *fname;
+{
+    char_u *p;
+
+    for (p = fname; isalpha(*p); ++p)
+	;
+    return path_is_url(p);
+}
+
+/*
+ * Return TRUE if "name" is a full (absolute) path name or URL.
+ */
+    int
+vim_isAbsName(name)
+    char_u	*name;
+{
+    return (path_with_url(name) != 0 || mch_isFullName(name));
+}
+
+/*
+ * Get absolute file name into buffer 'buf' of length 'len' bytes.
+ *
+ * return FAIL for failure, OK otherwise
+ */
+    int
+vim_FullName(fname, buf, len, force)
+    char_u	*fname, *buf;
+    int		len;
+    int		force;
+{
+    int		retval = OK;
+    int		url;
+
+    *buf = NUL;
+    if (fname == NULL)
+	return FAIL;
+
+    url = path_with_url(fname);
+    if (!url)
+	retval = mch_FullName(fname, buf, len, force);
+    if (url || retval == FAIL)
+    {
+	/* something failed; use the file name (truncate when too long) */
+	STRNCPY(buf, fname, len);
+	buf[len - 1] = NUL;
+    }
+#if defined(MACOS_CLASSIC) || defined(OS2) || defined(MSDOS) || defined(MSWIN)
+    slash_adjust(buf);
+#endif
+    return retval;
+}
+
+/*
+ * Return the minimal number of rows that is needed on the screen to display
+ * the current number of windows.
+ */
+    int
+min_rows()
+{
+    int		total;
+
+    if (firstwin == NULL)	/* not initialized yet */
+	return MIN_LINES;
+
+    total = 1;		/* count the room for the command line */
+#ifdef FEAT_WINDOWS
+    total += frame_minheight(topframe, NULL);
+#else
+    total += 1;		/* at least one window should have a line! */
+#endif
+    return total;
+}
+
+/*
+ * Return TRUE if there is only one window, not counting a help or preview
+ * window, unless it is the current window.
+ */
+    int
+only_one_window()
+{
+#ifdef FEAT_WINDOWS
+    int		count = 0;
+    win_T	*wp;
+
+    for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	if (!(wp->w_buffer->b_help
+# ifdef FEAT_QUICKFIX
+		    || wp->w_p_pvw
+# endif
+	     ) || wp == curwin)
+	    ++count;
+    return (count <= 1);
+#else
+    return TRUE;
+#endif
+}
+
+#if defined(FEAT_WINDOWS) || defined(FEAT_AUTOCMD) || defined(PROTO)
+/*
+ * Correct the cursor line number in other windows.  Used after changing the
+ * current buffer, and before applying autocommands.
+ * When "do_curwin" is TRUE, also check current window.
+ */
+    void
+check_lnums(do_curwin)
+    int		do_curwin;
+{
+    win_T	*wp;
+
+#ifdef FEAT_WINDOWS
+    for (wp = firstwin; wp != NULL; wp = wp->w_next)
+	if ((do_curwin || wp != curwin) && wp->w_buffer == curbuf)
+#else
+    wp = curwin;
+    if (do_curwin)
+#endif
+	{
+	    if (wp->w_cursor.lnum > curbuf->b_ml.ml_line_count)
+		wp->w_cursor.lnum = curbuf->b_ml.ml_line_count;
+	    if (wp->w_topline > curbuf->b_ml.ml_line_count)
+		wp->w_topline = curbuf->b_ml.ml_line_count;
+	}
+}
+#endif
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+
+/*
+ * A snapshot of the window sizes, to restore them after closing the help
+ * window.
+ * Only these fields are used:
+ * fr_layout
+ * fr_width
+ * fr_height
+ * fr_next
+ * fr_child
+ * fr_win (only valid for the old curwin, NULL otherwise)
+ */
+static frame_T *snapshot = NULL;
+
+/*
+ * Create a snapshot of the current frame sizes.
+ */
+    static void
+make_snapshot()
+{
+    clear_snapshot();
+    make_snapshot_rec(topframe, &snapshot);
+}
+
+    static void
+make_snapshot_rec(fr, frp)
+    frame_T	*fr;
+    frame_T	**frp;
+{
+    *frp = (frame_T *)alloc_clear((unsigned)sizeof(frame_T));
+    if (*frp == NULL)
+	return;
+    (*frp)->fr_layout = fr->fr_layout;
+# ifdef FEAT_VERTSPLIT
+    (*frp)->fr_width = fr->fr_width;
+# endif
+    (*frp)->fr_height = fr->fr_height;
+    if (fr->fr_next != NULL)
+	make_snapshot_rec(fr->fr_next, &((*frp)->fr_next));
+    if (fr->fr_child != NULL)
+	make_snapshot_rec(fr->fr_child, &((*frp)->fr_child));
+    if (fr->fr_layout == FR_LEAF && fr->fr_win == curwin)
+	(*frp)->fr_win = curwin;
+}
+
+/*
+ * Remove any existing snapshot.
+ */
+    static void
+clear_snapshot()
+{
+    clear_snapshot_rec(snapshot);
+    snapshot = NULL;
+}
+
+    static void
+clear_snapshot_rec(fr)
+    frame_T	*fr;
+{
+    if (fr != NULL)
+    {
+	clear_snapshot_rec(fr->fr_next);
+	clear_snapshot_rec(fr->fr_child);
+	vim_free(fr);
+    }
+}
+
+/*
+ * Restore a previously created snapshot, if there is any.
+ * This is only done if the screen size didn't change and the window layout is
+ * still the same.
+ */
+    static void
+restore_snapshot(close_curwin)
+    int		close_curwin;	    /* closing current window */
+{
+    win_T	*wp;
+
+    if (snapshot != NULL
+# ifdef FEAT_VERTSPLIT
+	    && snapshot->fr_width == topframe->fr_width
+# endif
+	    && snapshot->fr_height == topframe->fr_height
+	    && check_snapshot_rec(snapshot, topframe) == OK)
+    {
+	wp = restore_snapshot_rec(snapshot, topframe);
+	win_comp_pos();
+	if (wp != NULL && close_curwin)
+	    win_goto(wp);
+	redraw_all_later(CLEAR);
+    }
+    clear_snapshot();
+}
+
+/*
+ * Check if frames "sn" and "fr" have the same layout, same following frames
+ * and same children.
+ */
+    static int
+check_snapshot_rec(sn, fr)
+    frame_T	*sn;
+    frame_T	*fr;
+{
+    if (sn->fr_layout != fr->fr_layout
+	    || (sn->fr_next == NULL) != (fr->fr_next == NULL)
+	    || (sn->fr_child == NULL) != (fr->fr_child == NULL)
+	    || (sn->fr_next != NULL
+		&& check_snapshot_rec(sn->fr_next, fr->fr_next) == FAIL)
+	    || (sn->fr_child != NULL
+		&& check_snapshot_rec(sn->fr_child, fr->fr_child) == FAIL))
+	return FAIL;
+    return OK;
+}
+
+/*
+ * Copy the size of snapshot frame "sn" to frame "fr".  Do the same for all
+ * following frames and children.
+ * Returns a pointer to the old current window, or NULL.
+ */
+    static win_T *
+restore_snapshot_rec(sn, fr)
+    frame_T	*sn;
+    frame_T	*fr;
+{
+    win_T	*wp = NULL;
+    win_T	*wp2;
+
+    fr->fr_height = sn->fr_height;
+# ifdef FEAT_VERTSPLIT
+    fr->fr_width = sn->fr_width;
+# endif
+    if (fr->fr_layout == FR_LEAF)
+    {
+	frame_new_height(fr, fr->fr_height, FALSE, FALSE);
+# ifdef FEAT_VERTSPLIT
+	frame_new_width(fr, fr->fr_width, FALSE);
+# endif
+	wp = sn->fr_win;
+    }
+    if (sn->fr_next != NULL)
+    {
+	wp2 = restore_snapshot_rec(sn->fr_next, fr->fr_next);
+	if (wp2 != NULL)
+	    wp = wp2;
+    }
+    if (sn->fr_child != NULL)
+    {
+	wp2 = restore_snapshot_rec(sn->fr_child, fr->fr_child);
+	if (wp2 != NULL)
+	    wp = wp2;
+    }
+    return wp;
+}
+
+#endif
+
+#if (defined(FEAT_GUI) && defined(FEAT_VERTSPLIT)) || defined(PROTO)
+/*
+ * Return TRUE if there is any vertically split window.
+ */
+    int
+win_hasvertsplit()
+{
+    frame_T	*fr;
+
+    if (topframe->fr_layout == FR_ROW)
+	return TRUE;
+
+    if (topframe->fr_layout == FR_COL)
+	for (fr = topframe->fr_child; fr != NULL; fr = fr->fr_next)
+	    if (fr->fr_layout == FR_ROW)
+		return TRUE;
+
+    return FALSE;
+}
+#endif