GNU bug report logs - #61667
29.0.60; Failure to redisplay

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Po Lu <luangruo <at> yahoo.com>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 61667 <at> debbugs.gnu.org, gregory <at> heytings.org
Subject: bug#61667: 29.0.60; Failure to redisplay
Date: Sat, 25 Feb 2023 15:18:23 +0200

On 25/02/2023 09:21, Po Lu via Bug reports for GNU Emacs, the Swiss army 
knife of text editors wrote:
> Eli Zaretskii<eliz <at> gnu.org>  writes:
> 
>> Yes.  Which means these X and GTK calls are not the direct culprit of
>> the delay.
> What happens if you add an explicit call to XFlush afterwards?
> If that makes it work, then the frame title delay is caused by some
> slowness after the call is made.
> 
> An Xlib function will only place the request onto an output buffer,
> which is normally flushed when it becomes full or the next time Xlib
> decides to read input or wait for a reply from the X server.  The
> library also performs optimizations on requests inside the output
> buffer, mostly those of the Poly* type.  You have to call XFlush
> manually after making a request if you really want it to be sent.

Alas, this doesn't fix the problem:

diff --git a/src/xfns.c b/src/xfns.c
index 528ae61ca32..803a692bfbf 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -2211,6 +2211,8 @@ x_set_name_internal (struct frame *f, Lisp_Object 
name)
 #ifdef USE_GTK
         gtk_window_set_title (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
                               SSDATA (encoded_name));
+	XFlush (FRAME_X_DISPLAY (f));
+
 #else /* not USE_GTK */
 	XSetWMName (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f), &text);
 	XChangeProperty (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f),
@@ -2291,6 +2293,8 @@ x_set_name (struct frame *f, Lisp_Object name, 
bool explicit)
     name = f->title;

   x_set_name_internal (f, name);
+
+  XFlush (FRAME_X_DISPLAY (f));
 }

 /* This function should be called when the user's lisp code has
@@ -2331,6 +2335,8 @@ x_set_title (struct frame *f, Lisp_Object name, 
Lisp_Object old_name)
     CHECK_STRING (name);

   x_set_name_internal (f, name);
+
+  XFlush (FRAME_X_DISPLAY (f));
 }

 void

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