# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1641475805 -3600
# Node ID aa613a3084b9a4c3fa295a232c9d5645a338b2cb
# Parent  b96cf64806247e2ad1ab4b8c4663d92f2a1f3336
patch 8.2.4018: ml_get error when win_execute redraws with Visual selection

Commit: https://github.com/vim/vim/commit/18f4740f043b353abe47b7a00131317052457686
Author: Bram Moolenaar <Bram@vim.org>
Date:   Thu Jan 6 13:24:51 2022 +0000

    patch 8.2.4018: ml_get error when win_execute redraws with Visual selection

    Problem:    ml_get error when win_execute redraws with Visual selection.
    Solution:   Disable Visual area temporarily. (closes https://github.com/vim/vim/issues/9479)

diff --git a/src/evalbuffer.c b/src/evalbuffer.c
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -930,31 +930,29 @@ find_win_for_buf(
  */
     void
 switch_to_win_for_buf(
-    buf_T	*buf,
-    win_T	**save_curwinp,
-    tabpage_T	**save_curtabp,
-    bufref_T	*save_curbuf)
+	buf_T	    *buf,
+	switchwin_T *switchwin,
+	bufref_T    *save_curbuf)
 {
     win_T	*wp;
     tabpage_T	*tp;
 
     if (find_win_for_buf(buf, &wp, &tp) == FAIL)
 	switch_buffer(save_curbuf, buf);
-    else if (switch_win(save_curwinp, save_curtabp, wp, tp, TRUE) == FAIL)
+    else if (switch_win(switchwin, wp, tp, TRUE) == FAIL)
     {
-	restore_win(*save_curwinp, *save_curtabp, TRUE);
+	restore_win(switchwin, TRUE);
 	switch_buffer(save_curbuf, buf);
     }
 }
 
     void
 restore_win_for_buf(
-    win_T	*save_curwin,
-    tabpage_T	*save_curtab,
-    bufref_T	*save_curbuf)
+	switchwin_T *switchwin,
+	bufref_T    *save_curbuf)
 {
     if (save_curbuf->br_buf == NULL)
-	restore_win(save_curwin, save_curtab, TRUE);
+	restore_win(switchwin, TRUE);
     else
 	restore_buffer(save_curbuf);
 }
diff --git a/src/evalfunc.c b/src/evalfunc.c
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -6864,8 +6864,7 @@ f_line(typval_T *argvars, typval_T *rett
     int		id;
     tabpage_T	*tp;
     win_T	*wp;
-    win_T	*save_curwin;
-    tabpage_T	*save_curtab;
+    switchwin_T	switchwin;
 
     if (in_vim9script()
 	    && (check_for_string_arg(argvars, 0) == FAIL
@@ -6879,13 +6878,12 @@ f_line(typval_T *argvars, typval_T *rett
 	wp = win_id2wp_tp(id, &tp);
 	if (wp != NULL && tp != NULL)
 	{
-	    if (switch_win_noblock(&save_curwin, &save_curtab, wp, tp, TRUE)
-									 == OK)
+	    if (switch_win_noblock(&switchwin, wp, tp, TRUE) == OK)
 	    {
 		check_cursor();
 		fp = var2fpos(&argvars[0], TRUE, &fnum, FALSE);
 	    }
-	    restore_win_noblock(save_curwin, save_curtab, TRUE);
+	    restore_win_noblock(&switchwin, TRUE);
 	}
     }
     else
diff --git a/src/evalvars.c b/src/evalvars.c
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -3769,8 +3769,7 @@ getwinvar(
     dictitem_T	*v;
     tabpage_T	*tp = NULL;
     int		done = FALSE;
-    win_T	*oldcurwin;
-    tabpage_T	*oldtabpage;
+    switchwin_T	switchwin;
     int		need_switch_win;
 
     if (off == 1)
@@ -3791,7 +3790,7 @@ getwinvar(
 	// autocommands get blocked.
 	need_switch_win = !(tp == curtab && win == curwin);
 	if (!need_switch_win
-		  || switch_win(&oldcurwin, &oldtabpage, win, tp, TRUE) == OK)
+		  || switch_win(&switchwin, win, tp, TRUE) == OK)
 	{
 	    if (*varname == '&')
 	    {
@@ -3826,7 +3825,7 @@ getwinvar(
 
 	if (need_switch_win)
 	    // restore previous notion of curwin
-	    restore_win(oldcurwin, oldtabpage, TRUE);
+	    restore_win(&switchwin, TRUE);
     }
 
     if (!done && argvars[off + 2].v_type != VAR_UNKNOWN)
@@ -3869,8 +3868,7 @@ set_option_from_tv(char_u *varname, typv
 setwinvar(typval_T *argvars, int off)
 {
     win_T	*win;
-    win_T	*save_curwin;
-    tabpage_T	*save_curtab;
+    switchwin_T	switchwin;
     int		need_switch_win;
     char_u	*varname, *winvarname;
     typval_T	*varp;
@@ -3891,7 +3889,7 @@ setwinvar(typval_T *argvars, int off)
     {
 	need_switch_win = !(tp == curtab && win == curwin);
 	if (!need_switch_win
-	       || switch_win(&save_curwin, &save_curtab, win, tp, TRUE) == OK)
+	       || switch_win(&switchwin, win, tp, TRUE) == OK)
 	{
 	    if (*varname == '&')
 		set_option_from_tv(varname + 1, varp);
@@ -3908,7 +3906,7 @@ setwinvar(typval_T *argvars, int off)
 	    }
 	}
 	if (need_switch_win)
-	    restore_win(save_curwin, save_curtab, TRUE);
+	    restore_win(&switchwin, TRUE);
     }
 }
 
@@ -4165,8 +4163,8 @@ get_clear_redir_ga(void)
     void
 f_gettabvar(typval_T *argvars, typval_T *rettv)
 {
-    win_T	*oldcurwin;
-    tabpage_T	*tp, *oldtabpage;
+    switchwin_T	switchwin;
+    tabpage_T	*tp;
     dictitem_T	*v;
     char_u	*varname;
     int		done = FALSE;
@@ -4185,7 +4183,7 @@ f_gettabvar(typval_T *argvars, typval_T 
     {
 	// Set tp to be our tabpage, temporarily.  Also set the window to the
 	// first window in the tabpage, otherwise the window is not valid.
-	if (switch_win(&oldcurwin, &oldtabpage,
+	if (switch_win(&switchwin,
 		tp == curtab || tp->tp_firstwin == NULL ? firstwin
 					    : tp->tp_firstwin, tp, TRUE) == OK)
 	{
@@ -4200,7 +4198,7 @@ f_gettabvar(typval_T *argvars, typval_T 
 	}
 
 	// restore previous notion of curwin
-	restore_win(oldcurwin, oldtabpage, TRUE);
+	restore_win(&switchwin, TRUE);
     }
 
     if (!done && argvars[2].v_type != VAR_UNKNOWN)
diff --git a/src/evalwindow.c b/src/evalwindow.c
--- a/src/evalwindow.c
+++ b/src/evalwindow.c
@@ -689,8 +689,7 @@ f_win_execute(typval_T *argvars, typval_
     int		id;
     tabpage_T	*tp;
     win_T	*wp;
-    win_T	*save_curwin;
-    tabpage_T	*save_curtab;
+    switchwin_T	switchwin;
 
     // Return an empty string if something fails.
     rettv->v_type = VAR_STRING;
@@ -727,12 +726,12 @@ f_win_execute(typval_T *argvars, typval_
 	}
 #endif
 
-	if (switch_win_noblock(&save_curwin, &save_curtab, wp, tp, TRUE) == OK)
+	if (switch_win_noblock(&switchwin, wp, tp, TRUE) == OK)
 	{
 	    check_cursor();
 	    execute_common(argvars, rettv, 1);
 	}
-	restore_win_noblock(save_curwin, save_curtab, TRUE);
+	restore_win_noblock(&switchwin, TRUE);
 #ifdef FEAT_AUTOCHDIR
 	if (apply_acd)
 	    do_autochdir();
@@ -1247,14 +1246,13 @@ f_winwidth(typval_T *argvars, typval_T *
  */
     int
 switch_win(
-    win_T	**save_curwin,
-    tabpage_T	**save_curtab,
-    win_T	*win,
-    tabpage_T	*tp,
-    int		no_display)
+	switchwin_T *switchwin,
+	win_T	    *win,
+	tabpage_T   *tp,
+	int	    no_display)
 {
     block_autocmds();
-    return switch_win_noblock(save_curwin, save_curtab, win, tp, no_display);
+    return switch_win_noblock(switchwin, win, tp, no_display);
 }
 
 /*
@@ -1262,16 +1260,25 @@ switch_win(
  */
     int
 switch_win_noblock(
-    win_T	**save_curwin,
-    tabpage_T	**save_curtab,
-    win_T	*win,
-    tabpage_T	*tp,
-    int		no_display)
+	switchwin_T *switchwin,
+	win_T	    *win,
+	tabpage_T   *tp,
+	int	    no_display)
 {
-    *save_curwin = curwin;
+    CLEAR_POINTER(switchwin);
+    switchwin->sw_curwin = curwin;
+    if (win == curwin)
+	switchwin->sw_same_win = TRUE;
+    else
+    {
+	// Disable Visual selection, because redrawing may fail.
+	switchwin->sw_visual_active = VIsual_active;
+	VIsual_active = FALSE;
+    }
+
     if (tp != NULL)
     {
-	*save_curtab = curtab;
+	switchwin->sw_curtab = curtab;
 	if (no_display)
 	{
 	    curtab->tp_firstwin = firstwin;
@@ -1299,11 +1306,10 @@ switch_win_noblock(
  */
     void
 restore_win(
-    win_T	*save_curwin,
-    tabpage_T	*save_curtab,
-    int		no_display)
+	switchwin_T *switchwin,
+	int	    no_display)
 {
-    restore_win_noblock(save_curwin, save_curtab, no_display);
+    restore_win_noblock(switchwin, no_display);
     unblock_autocmds();
 }
 
@@ -1312,28 +1318,31 @@ restore_win(
  */
     void
 restore_win_noblock(
-    win_T	*save_curwin,
-    tabpage_T	*save_curtab,
-    int		no_display)
+	switchwin_T *switchwin,
+	int	    no_display)
 {
-    if (save_curtab != NULL && valid_tabpage(save_curtab))
+    if (switchwin->sw_curtab != NULL && valid_tabpage(switchwin->sw_curtab))
     {
 	if (no_display)
 	{
 	    curtab->tp_firstwin = firstwin;
 	    curtab->tp_lastwin = lastwin;
 	    curtab->tp_topframe = topframe;
-	    curtab = save_curtab;
+	    curtab = switchwin->sw_curtab;
 	    firstwin = curtab->tp_firstwin;
 	    lastwin = curtab->tp_lastwin;
 	    topframe = curtab->tp_topframe;
 	}
 	else
-	    goto_tabpage_tp(save_curtab, FALSE, FALSE);
+	    goto_tabpage_tp(switchwin->sw_curtab, FALSE, FALSE);
     }
-    if (win_valid(save_curwin))
+
+    if (!switchwin->sw_same_win)
+	VIsual_active = switchwin->sw_visual_active;
+
+    if (win_valid(switchwin->sw_curwin))
     {
-	curwin = save_curwin;
+	curwin = switchwin->sw_curwin;
 	curbuf = curwin->w_buffer;
     }
 # ifdef FEAT_PROP_POPUP
diff --git a/src/if_py_both.h b/src/if_py_both.h
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -3529,8 +3529,7 @@ set_option_value_for(
 	int opt_type,
 	void *from)
 {
-    win_T	*save_curwin = NULL;
-    tabpage_T	*save_curtab = NULL;
+    switchwin_T	switchwin;
     bufref_T	save_curbuf;
     int		set_ret = 0;
 
@@ -3538,17 +3537,17 @@ set_option_value_for(
     switch (opt_type)
     {
 	case SREQ_WIN:
-	    if (switch_win(&save_curwin, &save_curtab, (win_T *)from,
+	    if (switch_win(&switchwin, (win_T *)from,
 			      win_find_tabpage((win_T *)from), FALSE) == FAIL)
 	    {
-		restore_win(save_curwin, save_curtab, TRUE);
+		restore_win(&switchwin, TRUE);
 		if (VimTryEnd())
 		    return -1;
 		PyErr_SET_VIM(N_("problem while switching windows"));
 		return -1;
 	    }
 	    set_ret = set_option_value_err(key, numval, stringval, opt_flags);
-	    restore_win(save_curwin, save_curtab, TRUE);
+	    restore_win(&switchwin, TRUE);
 	    break;
 	case SREQ_BUF:
 	    switch_buffer(&save_curbuf, (buf_T *)from);
@@ -4410,8 +4409,7 @@ py_fix_cursor(linenr_T lo, linenr_T hi, 
 SetBufferLine(buf_T *buf, PyInt n, PyObject *line, PyInt *len_change)
 {
     bufref_T	save_curbuf = {NULL, 0, 0};
-    win_T	*save_curwin = NULL;
-    tabpage_T	*save_curtab = NULL;
+    switchwin_T	switchwin;
 
     // First of all, we check the type of the supplied Python object.
     // There are three cases:
@@ -4421,7 +4419,8 @@ SetBufferLine(buf_T *buf, PyInt n, PyObj
     if (line == Py_None || line == NULL)
     {
 	PyErr_Clear();
-	switch_to_win_for_buf(buf, &save_curwin, &save_curtab, &save_curbuf);
+	switchwin.sw_curwin = NULL;
+	switch_to_win_for_buf(buf, &switchwin, &save_curbuf);
 
 	VimTryStart();
 
@@ -4431,7 +4430,7 @@ SetBufferLine(buf_T *buf, PyInt n, PyObj
 	    RAISE_DELETE_LINE_FAIL;
 	else
 	{
-	    if (buf == curbuf && (save_curwin != NULL
+	    if (buf == curbuf && (switchwin.sw_curwin != NULL
 					   || save_curbuf.br_buf == NULL))
 		// Using an existing window for the buffer, adjust the cursor
 		// position.
@@ -4442,7 +4441,7 @@ SetBufferLine(buf_T *buf, PyInt n, PyObj
 		deleted_lines_mark((linenr_T)n, 1L);
 	}
 
-	restore_win_for_buf(save_curwin, save_curtab, &save_curbuf);
+	restore_win_for_buf(&switchwin, &save_curbuf);
 
 	if (VimTryEnd())
 	    return FAIL;
@@ -4463,7 +4462,7 @@ SetBufferLine(buf_T *buf, PyInt n, PyObj
 
 	// We do not need to free "save" if ml_replace() consumes it.
 	PyErr_Clear();
-	switch_to_win_for_buf(buf, &save_curwin, &save_curtab, &save_curbuf);
+	switch_to_win_for_buf(buf, &switchwin, &save_curbuf);
 
 	if (u_savesub((linenr_T)n) == FAIL)
 	{
@@ -4478,7 +4477,7 @@ SetBufferLine(buf_T *buf, PyInt n, PyObj
 	else
 	    changed_bytes((linenr_T)n, 0);
 
-	restore_win_for_buf(save_curwin, save_curtab, &save_curbuf);
+	restore_win_for_buf(&switchwin, &save_curbuf);
 
 	// Check that the cursor is not beyond the end of the line now.
 	if (buf == curbuf)
@@ -4517,8 +4516,7 @@ SetBufferLineList(
 	PyInt *len_change)
 {
     bufref_T	save_curbuf = {NULL, 0, 0};
-    win_T	*save_curwin = NULL;
-    tabpage_T	*save_curtab = NULL;
+    switchwin_T	switchwin;
 
     // First of all, we check the type of the supplied Python object.
     // There are three cases:
@@ -4532,7 +4530,8 @@ SetBufferLineList(
 
 	PyErr_Clear();
 	VimTryStart();
-	switch_to_win_for_buf(buf, &save_curwin, &save_curtab, &save_curbuf);
+	switchwin.sw_curwin = NULL;
+	switch_to_win_for_buf(buf, &switchwin, &save_curbuf);
 
 	if (u_savedel((linenr_T)lo, (long)n) == FAIL)
 	    RAISE_UNDO_FAIL;
@@ -4546,7 +4545,7 @@ SetBufferLineList(
 		    break;
 		}
 	    }
-	    if (buf == curbuf && (save_curwin != NULL
+	    if (buf == curbuf && (switchwin.sw_curwin != NULL
 					       || save_curbuf.br_buf == NULL))
 		// Using an existing window for the buffer, adjust the cursor
 		// position.
@@ -4557,7 +4556,7 @@ SetBufferLineList(
 		deleted_lines_mark((linenr_T)lo, (long)i);
 	}
 
-	restore_win_for_buf(save_curwin, save_curtab, &save_curbuf);
+	restore_win_for_buf(&switchwin, &save_curbuf);
 
 	if (VimTryEnd())
 	    return FAIL;
@@ -4605,7 +4604,8 @@ SetBufferLineList(
 	PyErr_Clear();
 
 	// START of region without "return".  Must call restore_buffer()!
-	switch_to_win_for_buf(buf, &save_curwin, &save_curtab, &save_curbuf);
+	switchwin.sw_curwin = NULL;
+	switch_to_win_for_buf(buf, &switchwin, &save_curbuf);
 
 	if (u_save((linenr_T)(lo-1), (linenr_T)hi) == FAIL)
 	    RAISE_UNDO_FAIL;
@@ -4680,14 +4680,14 @@ SetBufferLineList(
 						  (long)MAXLNUM, (long)extra);
 	changed_lines((linenr_T)lo, 0, (linenr_T)hi, (long)extra);
 
-	if (buf == curbuf && (save_curwin != NULL
+	if (buf == curbuf && (switchwin.sw_curwin != NULL
 					   || save_curbuf.br_buf == NULL))
 	    // Using an existing window for the buffer, adjust the cursor
 	    // position.
 	    py_fix_cursor((linenr_T)lo, (linenr_T)hi, (linenr_T)extra);
 
 	// END of region without "return".
-	restore_win_for_buf(save_curwin, save_curtab, &save_curbuf);
+	restore_win_for_buf(&switchwin, &save_curbuf);
 
 	if (VimTryEnd())
 	    return FAIL;
@@ -4717,8 +4717,7 @@ SetBufferLineList(
 InsertBufferLines(buf_T *buf, PyInt n, PyObject *lines, PyInt *len_change)
 {
     bufref_T	save_curbuf = {NULL, 0, 0};
-    win_T	*save_curwin = NULL;
-    tabpage_T	*save_curtab = NULL;
+    switchwin_T	switchwin;
 
     // First of all, we check the type of the supplied Python object.
     // It must be a string or a list, or the call is in error.
@@ -4731,7 +4730,7 @@ InsertBufferLines(buf_T *buf, PyInt n, P
 
 	PyErr_Clear();
 	VimTryStart();
-	switch_to_win_for_buf(buf, &save_curwin, &save_curtab, &save_curbuf);
+	switch_to_win_for_buf(buf, &switchwin, &save_curbuf);
 
 	if (u_save((linenr_T)n, (linenr_T)(n + 1)) == FAIL)
 	    RAISE_UNDO_FAIL;
@@ -4743,7 +4742,7 @@ InsertBufferLines(buf_T *buf, PyInt n, P
 	    appended_lines_mark((linenr_T)n, 1L);
 
 	vim_free(str);
-	restore_win_for_buf(save_curwin, save_curtab, &save_curbuf);
+	restore_win_for_buf(&switchwin, &save_curbuf);
 	update_screen(VALID);
 
 	if (VimTryEnd())
@@ -4783,7 +4782,7 @@ InsertBufferLines(buf_T *buf, PyInt n, P
 
 	PyErr_Clear();
 	VimTryStart();
-	switch_to_win_for_buf(buf, &save_curwin, &save_curtab, &save_curbuf);
+	switch_to_win_for_buf(buf, &switchwin, &save_curbuf);
 
 	if (u_save((linenr_T)n, (linenr_T)(n + 1)) == FAIL)
 	    RAISE_UNDO_FAIL;
@@ -4813,7 +4812,7 @@ InsertBufferLines(buf_T *buf, PyInt n, P
 	// Free the array of lines. All of its contents have now
 	// been freed.
 	PyMem_Free(array);
-	restore_win_for_buf(save_curwin, save_curtab, &save_curbuf);
+	restore_win_for_buf(&switchwin, &save_curbuf);
 
 	update_screen(VALID);
 
diff --git a/src/proto/evalbuffer.pro b/src/proto/evalbuffer.pro
--- a/src/proto/evalbuffer.pro
+++ b/src/proto/evalbuffer.pro
@@ -21,6 +21,6 @@ void f_setbufline(typval_T *argvars, typ
 void f_setline(typval_T *argvars, typval_T *rettv);
 void switch_buffer(bufref_T *save_curbuf, buf_T *buf);
 void restore_buffer(bufref_T *save_curbuf);
-void switch_to_win_for_buf(buf_T *buf, win_T **save_curwinp, tabpage_T **save_curtabp, bufref_T *save_curbuf);
-void restore_win_for_buf(win_T *save_curwin, tabpage_T *save_curtab, bufref_T *save_curbuf);
+void switch_to_win_for_buf(buf_T *buf, switchwin_T *switchwin, bufref_T *save_curbuf);
+void restore_win_for_buf(switchwin_T *switchwin, bufref_T *save_curbuf);
 /* vim: set ft=c : */
diff --git a/src/proto/evalwindow.pro b/src/proto/evalwindow.pro
--- a/src/proto/evalwindow.pro
+++ b/src/proto/evalwindow.pro
@@ -32,8 +32,8 @@ void f_winrestcmd(typval_T *argvars, typ
 void f_winrestview(typval_T *argvars, typval_T *rettv);
 void f_winsaveview(typval_T *argvars, typval_T *rettv);
 void f_winwidth(typval_T *argvars, typval_T *rettv);
-int switch_win(win_T **save_curwin, tabpage_T **save_curtab, win_T *win, tabpage_T *tp, int no_display);
-int switch_win_noblock(win_T **save_curwin, tabpage_T **save_curtab, win_T *win, tabpage_T *tp, int no_display);
-void restore_win(win_T *save_curwin, tabpage_T *save_curtab, int no_display);
-void restore_win_noblock(win_T *save_curwin, tabpage_T *save_curtab, int no_display);
+int switch_win(switchwin_T *switchwin, win_T *win, tabpage_T *tp, int no_display);
+int switch_win_noblock(switchwin_T *switchwin, win_T *win, tabpage_T *tp, int no_display);
+void restore_win(switchwin_T *switchwin, int no_display);
+void restore_win_noblock(switchwin_T *switchwin, int no_display);
 /* vim: set ft=c : */
diff --git a/src/structs.h b/src/structs.h
--- a/src/structs.h
+++ b/src/structs.h
@@ -4507,3 +4507,10 @@ typedef enum {
     FILTERMAP_MAPNEW
 } filtermap_T;
 
+// Structure used by switch_win() to pass values to restore_win()
+typedef struct {
+    win_T	*sw_curwin;
+    tabpage_T	*sw_curtab;
+    int		sw_same_win;	    // VIsual_active was not reset
+    int		sw_visual_active;
+} switchwin_T;
diff --git a/src/testdir/test_execute_func.vim b/src/testdir/test_execute_func.vim
--- a/src/testdir/test_execute_func.vim
+++ b/src/testdir/test_execute_func.vim
@@ -149,6 +149,16 @@ func Test_win_execute_other_tab()
   unlet xyz
 endfunc
 
+func Test_win_execute_visual_redraw()
+  call setline(1, ['a', 'b', 'c'])
+  new
+  wincmd p
+  call feedkeys("G\<C-V>", 'txn')
+  call win_execute(winnr('#')->win_getid(), 'redraw')
+  bwipe!
+  bwipe!
+endfunc
+
 func Test_win_execute_on_startup()
   CheckRunVimInTerminal
 
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4018,
+/**/
     4017,
 /**/
     4016,