commit 79cdf026f1b8a16298ee73be497c4bd5f3458cde
author Bram Moolenaar <Bram@vim.org> Sat May 20 14:07:00 2023 +0100
committer Bram Moolenaar <Bram@vim.org> Sat May 20 14:07:00 2023 +0100
tree 2f2381a497126df7030b96450b1b1bfd4257c487
parent bf63011a52a3cc32609ae5945665875062a5ae50

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/userfunc.c

diff --git a/src/userfunc.c b/src/userfunc.c
index 6f0d59d..5b2c876 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -3048,7 +3048,8 @@
     // Invoke functions added with ":defer".
     handle_defer_one(current_funccal);
 
-    --RedrawingDisabled;
+    if (RedrawingDisabled > 0)
+	--RedrawingDisabled;
 
     // when the function was aborted because of an error, return -1
     if ((did_emsg && (fp->uf_flags & FC_ABORT)) || rettv->v_type == VAR_UNKNOWN)