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From: Chong Yidong <cyd@stupidchicken.com>
Newsgroups: gmane.emacs.devel
Subject: Re: [simon.marshall@misys.com: Possible mouse-face redisplay glitch]
Date: Thu, 18 Jan 2007 11:31:08 -0500
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storm@cua.dk (Kim F. Storm) writes:

> Chong Yidong <cyd@stupidchicken.com> writes:
>
>> This bug was introduced by the following change:
>>
>> 2006-10-06  Kim F. Storm  <storm@cua.dk>
>>
>> 	* xdisp.c (pos_visible_p): Fix value when EOB is visible.
>>
>> Kim, do you remember what the rationale for this change was, and can
>> you think of why this is causing the problem?
>
> It fixed another bug:
>
> http://comments.gmane.org/gmane.emacs.devel/60425

It's not obvious to me why reverting this change to pos_visible_p
causes the bug to disappear, as it does.  Could you try to debug it?