bug#12745: crash in bidi_pop_it during (idle) redisplay

[Eli Zaretskii]

> Date: Tue, 30 Oct 2012 11:29:31 -0700
> From: Ami Fischman <ami@fischman.org>
> Cc: alptekin.aker@gmail.com, 12745@debbugs.gnu.org
> 
> (gdb) frame 7
> #7  0x0000000000451f23 in next_overlay_string (it=0x7fff2251f1e0) at
> xdisp.c:5223
> 5223          pop_it (it);
> (gdb) p    it->n_overlay_strings
> $60 = 1
> (gdb) p   it->overlay_strings_charpos
> $61 = 1295
> (gdb) p   it->sp
> $62 = 0

That's what I thought, but this is normal and doesn't tell anything
about why the problem happened.  Hmm...

Is it correct that the character at buffer position 1295 is a newline?

Also, what are the values of the following?

  it->stack[0].current
  it->stack[0].string
  it->stack[0].method
  it->method

(The second one I expect to be a Lisp string or nil.)