bug#7012: 24.0.50; bidi: crash while selecting region using mouse in X11

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 20 Sep 2010 16:04:11 +0300
> From: Thamer Mahmoud <thamer.mahmoud@gmail.com>
> Cc: 7012@debbugs.gnu.org
> 
> I did more testing, and I only had to drag the mouse once.  AFAICT,
> it's not the multiple highlighting that is causing this crash, but
> rather dragging the mouse upward (by pressing and holding the
> left-button) while trying to position cursor on an Arabic line that
> starts with L2R characters embedded in an R2L context (like the 2nd
> line in the testcase).

So you press and hold the left mouse button when the mouse pointer is
near the bottom of the window, and then move the mouse upward, is that
right?

> For instance, if I have the following content in the middle of a
> buffer:
> 
> ‏
> a ‏abcdef
> 
> Emacs crashes when dragging the mouse from any point below while
> moving upward to position cursor between "abcdef".

Please show me the entire contents of the buffer in this case.  "In
the middle of a buffer" is too ambiguous for me to try to reproduce
this.

> Moreover, this crash seems specific to Arabic and reordered Latin text
> using RLM (like the above example).  I couldn't reproduce this using
> Hebrew.

I tried with the text you sent with the report, not with Hebrew.

>  > If you can consistently reproduce the crash with the recipe you
>  > posted, then please type "pr *bidi_it" in frame #1 and post the
>  > results here.  Thanks.
> 
> Did you mean "p *bidi_it"?

Yes, thanks.