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Re: Bug in incremental undrawing of mouseover highlighting

From: Eli Zaretskii
Subject: Re: Bug in incremental undrawing of mouseover highlighting
Date: Sat, 25 Nov 2006 23:10:12 +0200

> Cc: YAMAMOTO Mitsuharu <address@hidden>,
>         address@hidden,  address@hidden
> From: Chong Yidong <address@hidden>
> Date: Sat, 25 Nov 2006 11:18:14 -0500
> > I don't consider myself much of a redisplay expert, but I did express
> > a (different) concern for the patch as posted, a concern that
> > seemingly had no effect whatsoever.
> It's still unclear, from the messages you sent, whether this bug can
> happen outside of HAVE_WINDOW_SYSTEM.  The bugfix is meant to plug a
> loophole in the code in note_mouse_highlight that computes whether or
> not the mouse highlight has been updated, which is only present for

You will see that the same code is duplicated, more or less, in
msdos.c, beginning at line 1612.  That is why I thought the same
problem could happen there, and that is why I was bothered by the fact
that the fix was only applied to builds that define

Meanwhile, I've built an MSDOS port of Emacs 22.0.91 and found I
couldn't reproduce the original problem in it.  So I guess the issue
of whether the same fix should be applied to the MSDOS port can now be

As to the concerns expressed by Yamamoto Mitsuharu, I would also
suggest that a redisplay expert looks into them.

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