Subject: bug#11998: 24.1.50; Crash in read-from-minibuffer

From: Eli Zaretskii <[email-masked]>
Date: Sat, 21 Jul 2012 11:57:41 +0300

> Date: Fri, 20 Jul 2012 13:03:51 -0600
> From: Christoph Scholtes <[email-masked]>
> CC: [email-masked]
> 
> On 7/20/2012 9:12 AM, Eli Zaretskii wrote:
> >> From: Christoph Scholtes <[email-masked]>
> >> Date: Fri, 20 Jul 2012 08:57:49 -0600
> >>
> >> gdb session is not available anymore.
> >
> > Why not?
> 
> I closed it, unfortunately.

That's just too bad.

AFAICS, we only ever set mouse_face_window to either nil or a window
object.  This case seems to imply that its value was neither, because
clear_mouse_face verifies it's non-nil before calling show_mouse_face.
Therefore, it's important to look at the contents of that object,
because the only value other than nil or a window could be garbage,
which would hint on some memory management problem.  Or maybe I'm
missing something.