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

Previous Next

Full log

Message #440 received at 61667 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 61667 <at> debbugs.gnu.org, Gregory Heytings <gregory <at> heytings.org>,
 Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#61667: 29.0.60; Failure to redisplay
Date: Fri, 03 Mar 2023 08:54:43 +0800

Dmitry Gutov <dgutov <at> yandex.ru> writes:

> I've done so further investigation. Started with trying to find out
> which part of x_set_name_internal causes the problem. Commented out
> this or that call, and none seemed to make a difference.
>
> So I commented out both existing calls to x_set_name_internal: in
> x_set_name and x_set_title. Recompiled -- and the problem still
> reproduces.
>
> Then I added --eval "(setq frame-title-format \"aaa\")" to the command
> line, which we previously identified as potential fix/workaround --
> the problem _still_ reproduces. The frequency seems to be ~the same as
> without it, as long as the x_set_name_internal calls are commented
> out.
>
> With x_set_name_internal not commented out, (setq frame-title-format
> "aaa") seems to lower the frequency of the issue, which coupled with
> blink-cursor-mode (which was previously on, and which fires timers
> over regular intervals) made it rare enough for me to declare the
> problem absent. And also this addition, which now seems to make the
> problem _more_ likely to happen"
>
>   --eval "(add-hook 'find-file-hook #'redisplay t)
>
> So I went back to the previous Emacs versions.
>
> This MRE:
>
>   src/emacs -Q --eval "(tool-bar-mode -1)" --eval "(menu-bar-mode -1)"
>   --eval "(scroll-bar-mode -1)" --eval "(global-set-key \"a\" (lambda
>   () (interactive) (insert \"!\") (redisplay) (find-file
>   \"xassociations.rb\") ))" --eval "(add-hook 'find-file-hook
>   #'redisplay t)" --eval "(blink-cursor-mode -1 )" --eval "(setq
>   frame-title-format \"aaa\")"
>
>   Press 'a'. See if the buffer is displayed after a delay.

Could you send me xassociations.rb?  I can't reproduce this with any
file of my own.

> reproduces (though a little less frequently) in Emacs 28, 27, 26
>
> In 26 it happened ~5 times over 100 tries.
>
> It doesn't seem to reproduce in Emacs 25, though that version is
> pretty buggy here: it tends to hang during startup (around 1 in 6
> times) and I have to pass --eval "(set-frame-size nil 40 18)" for its
> window to have a reasonable size.

I'm not surprised: Emacs 25 doesn't support double buffering.

> --eval "(modify-frame-parameters nil '((undecorated . t)))", OTOH, we
>   can also cross out from the list of fixes: the problem still happens
>   with it, though seemingly less often (first repro at the 15th try).

OK, thanks.  Damned blink-cursor-mode!  Does the frame still refresh
when you hover over the title bar buttons?

Also, since we now know blink-cursor-mode was previously screwing with
the results, would you please try some other window manager again and
see if the problem reproduces without GNOME?

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.