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bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before
From: |
Eli Zaretskii |
Subject: |
bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window |
Date: |
Mon, 06 Jan 2014 18:33:02 +0200 |
> Date: Mon, 6 Jan 2014 09:20:03 +0100
> From: Anders Lindgren <andlind@gmail.com>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 16129@debbugs.gnu.org
>
> I think the incorrect state occurs when the new early exit occurs from
> redsplay_window. When I added the condition "&& PT == w->last_point", both
> the recentering problem and speed issues were solved.
Indeed, this was my conclusion as well. (Except that PT is not quite
right, as the window could be displaying a buffer that is not the
current one at that early point in redisplay_window.)
What this caused was that the window redisplay was mistakenly skipped,
but then we marked that window's display "accurate", which confused
the heck out of the display engine.
So I installed the patch below to fix this regression, and I'm marking
this bug done. Feel free to reopen if there are any leftovers.
Btw, I strongly recommend against messing with window-start (or
anything else that potentially requires redisplay) in a
post-command-hook: doing so disables some important redisplay
optimizations, and can easily trigger subtle misfeatures. I suggest
to look for a better method to do what follow-mode needs to do, even
if that means we'd have to implement a special hook we don't yet have.
Thanks.
=== modified file 'src/xdisp.c'
--- src/xdisp.c 2014-01-01 17:44:48 +0000
+++ src/xdisp.c 2014-01-06 16:21:39 +0000
@@ -15621,7 +15621,8 @@ redisplay_window (Lisp_Object window, bo
&& REDISPLAY_SOME_P ()
&& !w->redisplay
&& !f->redisplay
- && !buffer->text->redisplay)
+ && !buffer->text->redisplay
+ && BUF_PT (buffer) == w->last_point)
return;
/* Make sure that both W's markers are valid. */
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/02
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/02
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/05
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Eli Zaretskii, 2014/01/05
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/06
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window,
Eli Zaretskii <=
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/07
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Eli Zaretskii, 2014/01/10
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/10
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Eli Zaretskii, 2014/01/10
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/13
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Stefan Monnier, 2014/01/13
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Eli Zaretskii, 2014/01/13
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/14
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Eli Zaretskii, 2014/01/14
- bug#16129: 24.3.50; Emacs slow with follow-mode when buffer ends before last window, Anders Lindgren, 2014/01/16