Re: mouse-face redisplay messy on Windows XP x64 Edition

[Kim F. Storm]

Michael Mauger <address@hidden> writes:

> John Paul Wallington writes:
>
>> 
>> I've noticed a weird redisplay bug on Emacs built and run with mingw
>> on Windows XP x64 Edition for development versions of Emacs built on
>> 2006-09-30 through 2006-10-14.
>> 
>> In a Gnus Summary buffer, mouse-wheel scrolling up and down over
>> Author's names causes fragments of the highlight mouse-face to remain
>> after the mouse cursor has left them.
>> 
>> Here's an example screenshot:
>> http://www.shootybangbang.com/redisplay-mouse-face-bug.png
>> 
>
> I've seen the same thing on W32 on recent CVS checkout over the last month or 
> so (current version: GNU Emacs 22.0.50.1 (i386-mingw-nt5.1.2600) of 
> 2006-09-30, 
> but I had seen it on a 2006-09-04 checkout as well).  

I can reproduce similar results with M-x shell on GNU/Linux following
your description (terminating each multi-line with C-j is crusial!!)

It looks like redisplay fails to "delete to end of line" when lines
have mouse face.


I've never seen the original "small artifacts" problem on GNU/Linux though.
But I usually have mouse-highlight set to 1, which may easily hide this
problem.

I don't have time to dig into it right now, but this is a corner case which
should not delay the release.

-- 
Kim F. Storm <address@hidden> http://www.cua.dk