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disturbing, hard-to-catch redisplay bug
From: |
John Wiegley |
Subject: |
disturbing, hard-to-catch redisplay bug |
Date: |
Mon, 09 Dec 2002 16:49:28 -0700 |
User-agent: |
Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.3.50 (i686-pc-linux-gnu) |
Well, I have seen this twice now, but I can't catch it. If I
restart my Emacs clean, the problem doesn't appear. It only happens
if I've been using Emacs for a while.
I did, however, at least capture it visually. These two images show
the bug:
In the first, I am editing a list of filenames:
http://www.gci-net.com/~johnw/root1.jpg.bz2
Now I press M-} to advance to the next whitespace line, at which
point it "appends" to the end of my lines with content from the new
buffer location:
http://www.gci-net.com/~johnw/root2.jpg.bz2
This is not real, however, as C-l (or any other redisplaying event)
will cure it. I *have* moved, but the text of my new location does
not start at column 0, but rather is at the end of the visual lines
from my previous location -- at least until the next redisplay.
I hope the pictures will trigger someone's memory. As I said,
changing my environment in any significant way causes the bug to
fade away.
I only see this when my screen is split. A one-window display does
not have the problem. A three-window display only has the problem
in the "half frame height weight" (i.e., the display you get after
pressing C-x 2 twice from a full frame). If I balance the
three-window display, the problem does not appear.
Very odd,
John
- disturbing, hard-to-catch redisplay bug,
John Wiegley <=