bug#54450: 29.0.50; redisplay--pre-redisplay-functions issue

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 18 Mar 2022 20:38:18 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 54450@debbugs.gnu.org
> 
> > Yes, this could solve the issue for the region, but not in general for
> > redisplay--update-cursor-face-highlight which was the initial problem
> > with Juri's code. Same for any other function that goes into the
> > pre-redisplay-functions hook.
> 
> I asked for a test case, and this is what you gave me.
> 
> If there's another test case, please show it.

But before you do, please try the alternative patch below:

diff --git a/src/xdisp.c b/src/xdisp.c
index 5cb5839..6d8d4aa 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -13211,7 +13211,8 @@ prepare_menu_bars (void)
 	      struct window *w = XWINDOW (this);
 	      if (w->redisplay
 		  || XFRAME (w->frame)->redisplay
-		  || XBUFFER (w->contents)->text->redisplay)
+		  || XBUFFER (w->contents)->text->redisplay
+		  || w->last_point != marker_position (w->pointm))
 		{
 		  windows = Fcons (this, windows);
 		}