# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1446211804 -3600
# Node ID ce8b286e89efffae829f71340d8518ff1d268ba3
# Parent  6ada823a8ee57eca91c0b1d37531976464b53209
commit https://github.com/vim/vim/commit/e7d1376b636e6c758196c3542bd2c1053f9edb75
Author: Bram Moolenaar <Bram@vim.org>
Date:   Fri Oct 30 14:23:33 2015 +0100

    patch 7.4.901
    Problem:    When a BufLeave autocommand changes folding in a way it syncs
                undo, undo can be corrupted.
    Solution:   Prevent undo sync. (Jacob Niehus)

diff --git a/src/popupmnu.c b/src/popupmnu.c
--- a/src/popupmnu.c
+++ b/src/popupmnu.c
@@ -568,7 +568,11 @@ pum_set_selected(n, repeat)
 	    if (p_pvh > 0 && p_pvh < g_do_tagpreview)
 		g_do_tagpreview = p_pvh;
 	    ++RedrawingDisabled;
+	    /* Prevent undo sync here, if an autocommand syncs undo weird
+	     * things can happen to the undo tree. */
+	    ++no_u_sync;
 	    resized = prepare_tagpreview(FALSE);
+	    --no_u_sync;
 	    --RedrawingDisabled;
 	    g_do_tagpreview = 0;
 
@@ -659,7 +663,9 @@ pum_set_selected(n, repeat)
 			 * redraw. */
 			if (resized)
 			{
+			    ++no_u_sync;
 			    win_enter(curwin_save, TRUE);
+			    --no_u_sync;
 			    update_topline();
 			}
 
@@ -670,7 +676,11 @@ pum_set_selected(n, repeat)
 			pum_do_redraw = FALSE;
 
 			if (!resized && win_valid(curwin_save))
+			{
+			    ++no_u_sync;
 			    win_enter(curwin_save, TRUE);
+			    --no_u_sync;
+			}
 
 			/* May need to update the screen again when there are
 			 * autocommands involved. */
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    901,
+/**/
     900,
 /**/
     899,