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RE: [h-e-w] jittery scrollbar

From: Bingham, Jay
Subject: RE: [h-e-w] jittery scrollbar
Date: Fri, 27 Sep 2002 14:29:44 -0500


I don't know that I have the answer to your question, but in an effort to help 
you isolate the source of the problem I can tell you that I have the same emacs 
version installed on Windows 2000 service pack 2 with a Microsoft optical wheel 
mouse.  I just tried dragging the scroll bar on a large file, on the README 
file and on another file about the size of the README file.  After several 
attempts I finally observed what could be described as "jittering up and down". 
 I noticed that it seems to be more prevalent in small files than in large 
files and seems to occur only when the scroll bar is being dragged very slowly. 
 I also noticed that when I would drag slowly emacs would start to repaint the 
screen then stop repainting when it detected motion.  This caused what I would 
describe as a flickering.  I suspect that the jittering is cause when the 
scroll bar is hovering near a threshold and emacs can't decide which side of 
the threshold the bar is on.  I also noticed that in a small file the scroll 
bar must be moved much farther than on a large file to cause movement of the 
text.  This may be related in some way.

Hope this helps.
.    HP - NonStop Austin Software & Services - Software Product Assurance
.    Austin, TX
. Language is the apparel in which your thoughts parade in public.
. Never clothe them in vulgar and shoddy attire.          -Dr. George W. Crane-

 -----Original Message-----
From:   Veda Larson Palmer [mailto:address@hidden 
Sent:   Friday, September 27, 2002 1:43 PM
To:     address@hidden
Subject:        [h-e-w] jittery scrollbar

Dear Emacs folks,

When I drag the scrollbar on my Windows Emacs, the buffer text jitters
up and down by several lines, making it difficult to read as I scroll
through a file.  This effect can be reproduced by scrolling through
the README file and is more noticeable toward the end of the file.

I am using:
GNU Emacs 21.2.1 from
Windows 2000 service pack 2

Is this a known bug?


P.S. The README says to mail address@hidden
but this bounces with a "User unknown" error.

reply via email to

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