bug#24614: 25.1.50; Exception after moving mouse over over a different window

[Eli Zaretskii]

> From: Alain Schneble <a.s@realize.ch>
> CC: <24614@debbugs.gnu.org>
> Date: Tue, 4 Oct 2016 19:24:34 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > What about
> >
> >  (gdb) p *glyph
> >
> 
> (gdb) p *glyph
> Cannot access memory at address 0x10c46fd0

So this is our villain.  Now how could that happen?  I hope the GDB
session is still alive; if it is, what do the commands below report?

 (gdb) frame 11
 (gdb) p *glyph_row
 (gdb) p w->output_cursor
 (gdb) p w->current_matrix->nrows
 (gdb) p w->current_matrix->matrix_w