bug#14276: 24.3.50; emacs_backtrace.txt

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Fri, 26 Apr 2013 22:09:38 +0200
> Cc: 14276@debbugs.gnu.org
> 
> ??
> ??:0
> w32_backtrace at w32fns.c:7687
> emacs_abort at w32fns.c:7719
> unblock_input_to at keyboard.c:7019
> unblock_input at keyboard.c:7030
> x_set_window_size at w32term.c:5845
> Fset_frame_size at frame.c:2447
> Ffuncall at eval.c:2681
> exec_byte_code at bytecode.c:900

This abort is because somewhere we have one more unblock_input call
than block_input calls.  But I don't see how to find that place
without a reproducible recipe.