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Re: The unwarranted scrolling assumption
From: |
Lennart Borgman |
Subject: |
Re: The unwarranted scrolling assumption |
Date: |
Wed, 16 Jun 2010 03:40:11 +0200 |
On Wed, Jun 16, 2010 at 2:55 AM, David De La Harpe Golden
<address@hidden> wrote:
> On 16/06/10 00:59, Lennart Borgman wrote:
>
>> All I do to check this is open window.c and then hit/hold down the
>> down arrow key (or "j" in viper).
>>
>> Does this work without "jumping scrolling" for you? (You have to test
>> for a while, the jumping does not happen always. I is a bit like
>> playing a computer game.)
>>
>
> I see this sometimes, with the recipe you outline.
>
> Sometimes emacs seems to decide to recenter, when it has "too much" input
> while display is taking its time (which I guess it might for e.g.
> font-locked window.c or a bunch of foreign scripts on view-hello-file)
>
> I found the faster I set keyboard autorepeat the easier it is to make
> happen. e.g. with my usual "xset r rate 150 60" it happens very
> occasionally, but with "xset r rate 150 180" it happens a lot.
Just a somewhat wild guess:
I wonder if this happens in redisplay_window in xdisp.c. This
functions has a labeled called "recenter":
/* Finally, just choose place to start which centers point */
recenter:
if (centering_position < 0)
centering_position = window_box_height (w) / 2;
The intent of that label seems to be just trying to came up to speed
with the input. But that is exactly the problem here.
However I dislike the way the problem is solved. I would rather wish
that the display engine instead calculated a new window start point
from the input command queue. I have no idea if that is actually
possible.
What I can see is that redisplay_window can restart through
redisplay_internal (the comment at the label "need_larger_matrices"
says that).
Perhaps this possibility to restart can be used instead.
But this is over the head for me.
Kim, are you there? Help!
- Re: The unwarranted scrolling assumption, (continued)
- Re: The unwarranted scrolling assumption, Juanma Barranquero, 2010/06/15
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/15
- Re: The unwarranted scrolling assumption, Sean Sieger, 2010/06/15
- Re: The unwarranted scrolling assumption, Juanma Barranquero, 2010/06/15
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/15
- Re: The unwarranted scrolling assumption, Juanma Barranquero, 2010/06/15
- Re: The unwarranted scrolling assumption, Chad Brown, 2010/06/15
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/15
- Re: The unwarranted scrolling assumption, Stefan Monnier, 2010/06/16
- Re: The unwarranted scrolling assumption, David De La Harpe Golden, 2010/06/15
- Re: The unwarranted scrolling assumption,
Lennart Borgman <=
- Re: The unwarranted scrolling assumption, Kim F. Storm, 2010/06/16
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/16
- Re: The unwarranted scrolling assumption, Eli Zaretskii, 2010/06/16
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/16
- Re: The unwarranted scrolling assumption, Eli Zaretskii, 2010/06/16
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/17
- Re: The unwarranted scrolling assumption, Eli Zaretskii, 2010/06/17
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/17
- Re: The unwarranted scrolling assumption, Eli Zaretskii, 2010/06/17
- Re: The unwarranted scrolling assumption, Lennart Borgman, 2010/06/17