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

[Eli Zaretskii]

> Date: Tue, 30 Oct 2012 14:08:49 -0700
> From: Ami Fischman <ami@fischman.org>
> Cc: alptekin.aker@gmail.com, 12745@debbugs.gnu.org
> 
> > Is it correct that the character at buffer position 1295 is a newline?
> >
> 
> Yes.
> 
> 
> > Also, what are the values of the following?
> >   it->stack[0].current
> >
> 
> (gdb) p  it->stack[0].current
> $63 = {
>   pos = {
>     charpos = 1295,
>     bytepos = 1295
>   },
>   overlay_string_index = 0,
>   string_pos = {
>     charpos = -1,
>     bytepos = -1
>   },
>   dpvec_index = -1
> }
> 
>   it->stack[0].string
> >
> 
>  (gdb) p   it->stack[0].string
> $66 = 9755602
> (gdb) xtype
> Lisp_Symbol
> (gdb) xsymbol  it->stack[0].string
> $67 = (struct Lisp_Symbol *) 0x94dbd0
>   "nil"
> 
>   it->stack[0].method
> >
> 
> (gdb) p   it->stack[0].method
> $68 = GET_FROM_BUFFER
> 
> 
> >   it->method
> >
> 
> (gdb) p it->method
> $69 = GET_FROM_BUFFER

As expected.

I guess we need to wait for another crash, this time in the trunk
code, and take it from there.  I will meanwhile fix
init_from_display_pos, because it's certainly looks broken, and could
well be the root cause for this.

Thanks.