From 79cdf026f1b8a16298ee73be497c4bd5f3458cde Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sat, 20 May 2023 14:07:00 +0100
Subject: patch 9.0.1571: RedrawingDisabled not used consistently

Problem:    RedrawingDisabled not used consistently.
Solution:   Avoid RedrawingDisabled going negative.  Set RedrawingDisabled in
            win_split_ins(). (closes #11961)
---
 src/ex_docmd.c | 48 ++++++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 22 deletions(-)

(limited to 'src/ex_docmd.c')

diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 430ca2ccb4..69af1ca1d0 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -550,7 +550,8 @@ do_exmode(
 #ifdef FEAT_GUI
     --hold_gui_events;
 #endif
-    --RedrawingDisabled;
+    if (RedrawingDisabled > 0)
+	--RedrawingDisabled;
     --no_wait_return;
     update_screen(UPD_CLEAR);
     need_wait_return = FALSE;
@@ -631,7 +632,7 @@ do_cmdline(
     static int	recursive = 0;		// recursive depth
     int		msg_didout_before_start = 0;
     int		count = 0;		// line number count
-    int		did_inc = FALSE;	// incremented RedrawingDisabled
+    int		did_inc_RedrawingDisabled = FALSE;
     int		retval = OK;
 #ifdef FEAT_EVAL
     cstack_T	cstack;			// conditional stack
@@ -977,7 +978,7 @@ do_cmdline(
 		msg_scroll = TRUE;  // put messages below each other
 		++no_wait_return;   // don't wait for return until finished
 		++RedrawingDisabled;
-		did_inc = TRUE;
+		did_inc_RedrawingDisabled = TRUE;
 	    }
 	}
 
@@ -1336,9 +1337,10 @@ do_cmdline(
      * hit return before redrawing the screen. With the ":global" command we do
      * this only once after the command is finished.
      */
-    if (did_inc)
+    if (did_inc_RedrawingDisabled)
     {
-	--RedrawingDisabled;
+	if (RedrawingDisabled > 0)
+	    --RedrawingDisabled;
 	--no_wait_return;
 	msg_scroll = FALSE;
 
@@ -7170,7 +7172,7 @@ do_exedit(
 
 		if (exmode_was != EXMODE_VIM)
 		    settmode(TMODE_RAW);
-		int save_rd = RedrawingDisabled;
+		int save_RedrawingDisabled = RedrawingDisabled;
 		RedrawingDisabled = 0;
 		int save_nwr = no_wait_return;
 		no_wait_return = 0;
@@ -7187,7 +7189,7 @@ do_exedit(
 		main_loop(FALSE, TRUE);
 
 		pending_exmode_active = FALSE;
-		RedrawingDisabled = save_rd;
+		RedrawingDisabled = save_RedrawingDisabled;
 		no_wait_return = save_nwr;
 		msg_scroll = save_ms;
 #ifdef FEAT_GUI
@@ -8438,11 +8440,12 @@ ex_redraw(exarg_T *eap)
     void
 redraw_cmd(int clear)
 {
-    int		r = RedrawingDisabled;
-    int		p = p_lz;
-
+    int save_RedrawingDisabled = RedrawingDisabled;
     RedrawingDisabled = 0;
+
+    int save_p_lz = p_lz;
     p_lz = FALSE;
+
     validate_cursor();
     update_topline();
     update_screen(clear ? UPD_CLEAR : VIsual_active ? UPD_INVERTED : 0);
@@ -8454,8 +8457,8 @@ redraw_cmd(int clear)
 # endif
 	resize_console_buf();
 #endif
-    RedrawingDisabled = r;
-    p_lz = p;
+    RedrawingDisabled = save_RedrawingDisabled;
+    p_lz = save_p_lz;
 
     // After drawing the statusline screen_attr may still be set.
     screen_stop_highlight();
@@ -8480,9 +8483,6 @@ redraw_cmd(int clear)
     static void
 ex_redrawstatus(exarg_T *eap UNUSED)
 {
-    int		r = RedrawingDisabled;
-    int		p = p_lz;
-
     if (eap->forceit)
 	status_redraw_all();
     else
@@ -8490,14 +8490,18 @@ ex_redrawstatus(exarg_T *eap UNUSED)
     if (msg_scrolled && (State & MODE_CMDLINE))
 	return;  // redraw later
 
+    int save_RedrawingDisabled = RedrawingDisabled;
     RedrawingDisabled = 0;
+
+    int save_p_lz = p_lz;
     p_lz = FALSE;
+
     if (State & MODE_CMDLINE)
 	redraw_statuslines();
     else
 	update_screen(VIsual_active ? UPD_INVERTED : 0);
-    RedrawingDisabled = r;
-    p_lz = p;
+    RedrawingDisabled = save_RedrawingDisabled;
+    p_lz = save_p_lz;
     out_flush();
 }
 
@@ -8507,16 +8511,16 @@ ex_redrawstatus(exarg_T *eap UNUSED)
     static void
 ex_redrawtabline(exarg_T *eap UNUSED)
 {
-    int		r = RedrawingDisabled;
-    int		p = p_lz;
-
+    int save_RedrawingDisabled = RedrawingDisabled;
     RedrawingDisabled = 0;
+
+    int save_p_lz = p_lz;
     p_lz = FALSE;
 
     draw_tabline();
 
-    RedrawingDisabled = r;
-    p_lz = p;
+    RedrawingDisabled = save_RedrawingDisabled;
+    p_lz = save_p_lz;
     out_flush();
 }
 
-- 
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