bug#15413: 24.3.50; Emacs gets hung by find-file for //<TAB>

[Eli Zaretskii]

> Date: Thu, 19 Sep 2013 08:51:41 +0900
> From: Katsumi Yamaoka <yamaoka@jpl.org>
> 
> When performing find-file, Emacs gets hung if I mistyped as:
> 
> Find file: // and <TAB>
> 
> As it might be because C-g doesn't break an inf-loop on Cygwin
> Emacs (bug#14553), there seems to be no way to get out of it
> except for killing the Emacs process.  For a wonder, Emacs does
> not eat CPU so much at that time.

My guess is it doesn't hang, it tries to access the network, since //
is the beginning of a UNC file name.  Try waiting longer.