bug#17609: 24.4.50; trunk r117096: disappearing cursor in X

[Jan Tatarik]

Starting with revision 117096, the X cursor will sometimes disappear and
remain invisible until as long as emacs is running.

Steps to reproduce (emacs with X support):

1) emacs -Q and the initial frame (frame A) appears

2) C-x 5 2 and new frame (frame B) appears

3) switch to frame B and position the mouse cursor inside the frame

4) start typing in frame B's scratch buffer - the mouse cursor
   disappears

5) C-x 5 0  to kill frame B

6) back in frame A, but the cursor is still invisible. It remains
   invisible until emacs is exited.


Expected behavior: in step 6, the cursor should have appeared
again. This is working correctly in revision 117095.











In GNU Emacs 24.4.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.17)
 of 2014-05-27 on nb-jtatarik2
Repository revision: 117165 eggert@cs.ucla.edu-20140527063729-rdl39wb178p4v6xj
Windowing system distributor `The X.Org Foundation', version 11.0.11303000
System Description:     Linux Mint 15 Olivia

Configured using:
 `configure --with-x-toolkit=gtk2'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY
GNUTLS LIBXML2 FREETYPE XFT ZLIB

Important settings:
  value of $LC_COLLATE: C
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_GB.UTF8
  value of $LANG: en_US.UTF8
  locale-coding-system: utf-8-unix