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bug#16526: 24.3.50; scroll-conservatively & c-mode regression
From: |
Eli Zaretskii |
Subject: |
bug#16526: 24.3.50; scroll-conservatively & c-mode regression |
Date: |
Sat, 25 Jan 2014 18:30:17 +0200 |
> Date: Sat, 25 Jan 2014 15:58:57 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: 16526@debbugs.gnu.org, acm@muc.de
>
> > Probably. I actually don't understand how come scroll-conservatively
> > affects non-scrolling commands. Can you elaborate on that?
>
> How should I know? I suppose redisplay_window eventually winds up
> calling the fontification function and sooner or later the c-code calls
> back_comment.
Yes, that's what happens. And it cannot be avoided, AFAICS, when
scroll-conservatively is on.
> > You also mentioned back_comment doing something unreasonable. Can you
> > expand on that, too? This part specifically I don't understand:
> >
> >> What happens is that apparently back_comment 530 times scans the buffer
> >> from the beginning of the buffer to the first comment before the current
> >> position where the list of current positions goes like this:
> >
> > Since the problem happens as result of beginning-of-buffer, why would
> > back_comment need to "scan the buffer from the beginning of the buffer
> > to the first comment before the current position"? And what is the
> > current position in this case?
>
> I earlier posted the first and last positions here:
>
> (780 14143 15852 18026 20032 20480 21464 21846 22845 23484 25453 26968
> ...
> 942907 943099 944334 948653 948830 948653 948830 948653 948830 948653
> 948830 780 12)
What I see is that find_defun_start is called many times, with its
first argument moving from _end_ of the buffer backwards. This
happens when Emacs needs to redisplay the last portion of the buffer,
immediately after the call to end-of-buffer.
Alan, I suspect that you tried to reproduce this without setting
scroll-conservatively to a value above 100. Because otherwise this is
100% reproducible.
If you still cannot reproduce this, please tell us what information to
collect for you.
> > Btw, if I disable font-lock ("M-x global-font-lock-mode RET") before
> > repeating the recipe, the move to bob is instantaneous, and turning on
> > font-lock after that doesn't seem to have any adverse effects on
> > responsiveness.
>
> Sure. The problem happens obviously via jit-lock.
JIT Lock is triggered also when font-lock is turned on after the move
to end of the buffer. But the difference seems to come from the fact
that under scroll-conservatively, we examine the buffer a little bit
above/below the window, when we decide where to put window-start.
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/23
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/24
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Alan Mackenzie, 2014/01/24
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Juanma Barranquero, 2014/01/24
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Eli Zaretskii, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression,
Eli Zaretskii <=
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Eli Zaretskii, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Eli Zaretskii, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Eli Zaretskii, 2014/01/25
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/26
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Eli Zaretskii, 2014/01/26
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Alan Mackenzie, 2014/01/26
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, martin rudalics, 2014/01/27
- bug#16526: 24.3.50; scroll-conservatively & c-mode regression, Stefan Monnier, 2014/01/27