vim-patch:8.0.0274

Problem:    When update_single_line() is called recursively, or another screen
            update happens while it is busy, errors may occur.
Solution:   Check and update updating_screen. (Christian Brabandt)

https://github.com/vim/vim/commit/070b33da93ad3a191664bb61f5ccc50781460c03

1 files changed, 3 insertions, 1 deletions

diff --git a/src/nvim/screen.c b/src/nvim/screen.c
index c0db076eff..10a184ad5b 100644
--- a/src/nvim/screen.c
+++ b/src/nvim/screen.c
@@ -487,9 +487,10 @@ void update_single_line(win_T *wp, linenr_T lnum)
   int j;
 
   // Don't do anything if the screen structures are (not yet) valid.
-  if (!screen_valid(true)) {
+  if (!screen_valid(true) || updating_screen) {
     return;
   }
+  updating_screen = true;
 
   if (lnum >= wp->w_topline && lnum < wp->w_botline
       && foldedCount(wp, lnum, &win_foldinfo) == 0) {
@@ -507,6 +508,7 @@ void update_single_line(win_T *wp, linenr_T lnum)
     }
   }
   need_cursor_line_redraw = FALSE;
+  updating_screen = false;
 }