bug#61667: 29.0.60; Failure to redisplay

[Dmitry Gutov <dgutov@yandex.ru>]

On 23/02/2023 11:41, Po Lu via Bug reports for GNU Emacs, the Swiss army 
knife of text editors wrote:
> Eli Zaretskii<eliz@gnu.org>  writes:
> 
>> Something related to GTK or Glib threads, perhaps?  Or some change in
>> XDBE?
> That shouldn't happen: we make the relevant X requests directly, and the
> DBE implementation in the X.Org server dates back to the sample server
> implementation, which has not changed since the late 90s.

Most of all I'm worried that this is some kind of bug in GNOME, which I 
don't have a lot of alternatives to.

>> Anyway, if this was not caused by a change in Emacs, we should
>> continue the current course of actions, which is to figure out why the
>> display on the glass is not updated.
> Yes, please.  Here's another stab:
> 
> diff --git a/src/xterm.c b/src/xterm.c
> index 5feaa4aef0f..cf093aa6381 100644
> --- a/src/xterm.c
> +++ b/src/xterm.c
> @@ -7463,6 +7463,8 @@ x_flip_and_flush (struct frame *f)
>         && !FRAME_TOOLTIP_P (f))
>       return;
>   
> +  return;
> +
>     block_input ();
>   #ifdef HAVE_XDBE
>     if (FRAME_X_NEED_BUFFER_FLIP (f))
> @@ -7518,9 +7520,7 @@ XTframe_up_to_date (struct frame *f)
>     FRAME_MOUSE_UPDATE (f);
>   
>   #ifdef HAVE_XDBE
> -  if (!buffer_flipping_blocked_p ()
> -      && FRAME_X_NEED_BUFFER_FLIP (f))
> -    show_back_buffer (f);
> +  show_back_buffer (f);
>   
>     /* The frame is now complete, as its contents have been drawn.  */
>     FRAME_X_COMPLETE_P (f) = true;
> 
> Please tell whether or not this makes the problem go away.

Thanks. It does not: the problem is still there.