bug#61667: 29.0.60; Failure to redisplay

[Gregory Heytings]

> So, I finished bisecting, at it points to:
>
> 817dd546497aadefbe9acc8762e3f7190799c5e6 is the first bad commit
> commit 817dd546497aadefbe9acc8762e3f7190799c5e6
> Author: Stefan Kangas <stefan@marxist.se>
> Date:   Sun Sep 13 18:24:31 2020 +0200
>
>    Improve frame-title-format and icon-title-format
>
>    * src/xdisp.c (syms_of_xdisp): Replace 'invocation-name' with the text
>    "%b - GNU Emacs" and replace "@" with " at ".  (Bug#41147)
>    * etc/NEWS: Announce the above change.

Aha.  This is rather surprising, but it also means that GNOME has perhaps 
nothing to do with the bug.  As I said in my other post, can you possibly 
try to reproduce the bug with your config with a non-GNOME window manager? 
(I don't know what distro you use, but there are a number of very 
lightweight window managers that you can easily install and remove.)

> - Before this commit: the window title doesn't change, it's always 
> emacs@hostname. But when I press 'a' (bound to 'find-file' lambda), 
> there never is a noticeable delay before the window contents change. The 
> buffer is displayed instantly.

This means that if you set frame-title-format to some constant string in 
Emacs 29 the bug should also disappear.  Can you check that?