bug#13864: 24.3.50; emacsclient -t loops when connected to emacs server running in X11

[Eli Zaretskii]

> From: ashish.is@lostca.se (Ashish SHUKLA)
> Cc: 13864@debbugs.gnu.org
> Date: Thu, 07 Mar 2013 00:22:43 +0530
> 
> Output with 'emacs -Q' was more frequent, whereas output with 'emacs -Q -nw'
> only printed when I pressed some key into the 'emacsclient' xterm window.

So with "emacs -Q", you saw update_frame_1 being constantly called all
the time, even if you didn't press any key after "C-x C-f", is that
right?

If so, please add "bt" to the breakpoint commands, so that we see who
is calling update_frame_1.