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bug#6671: moving point and scroll-conservatively


From: Eli Zaretskii
Subject: bug#6671: moving point and scroll-conservatively
Date: Sat, 26 Mar 2011 14:32:47 +0200

> From: Chong Yidong <address@hidden>
> Date: Wed, 23 Mar 2011 23:58:27 -0400
> Cc: address@hidden
> 
> The precise mechanism by which the fontification functions screw things
> up is by narrowing the buffer.  This is why, in last year's thread, the
> buffer's clip_changed flag was found to be set.  That forces recentering
> in redisplay_window (xdisp.c:14159).
> 
> So, a good fix might be to check whether redisplay-time fontification
> changes the buffer's restrictions, and, if so, reset the clip_changed
> flag.  That should make the 100619/100620 changes unnecessary.

As result of that last year's thread (which, to recap, started with
http://lists.gnu.org/archive/html/emacs-devel/2010-06/msg00554.html),
I looked closer at the clip_changed flag, and discussed my findings
with Gerd Möllmann.  Our conclusion was that it shouldn't be necessary
to test this flag when deciding whether try_scrolling can be called.
So I now committed a change to that effect (revno 103756 on the
trunk); please see if recentering as result of fontification functions
is now avoided.

This does not yet constitute resolution of this bug, I'm still working
on that.  Stay tuned.






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