bug#716: Bug in buffer-swap-text

[Geoff Gole]

> I cannot seem to reproduce it here, tho I'm not 100% sure how you run
> the above code.  Could you give a more detailed recipe, starting from
> "emacs -Q" and showing whether you use M-: or C-x C-e, ... ?

As I recall I started from an emacs -Q, pasted the code into
*scratch*, and hit C-j.

Currently I'm on a different version of emacs to the one in which
I observed the crashes:

  GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11) of
2008-11-22 on elegiac, modified by Debian

And with this emacs I can't reproduce the bug.

> Not sure what font backend the user on NetBSD/powerpc was using, but there 
> might
> be something that the xft font backend does that buffer-swap-text is relying 
> on
> which the w32 and one of the x font backends are not doing correctly.

If it's the font backend, then perhaps I won't see the crash with
an emacs -nw -Q. I'll try and test this.