Patch from Matthias to add support for the _NET_WM_USER_TIME_WINDOW EWMH

Patch from Matthias to add support for the _NET_WM_USER_TIME_WINDOW EWMH

2007-03-31  Elijah Newren  <newren gmail com>

	* gdk/x11/gdkwindow-x11.c (setup_toplevel_window,
	  gdk_x11_window_set_user_time):
	Patch from Matthias to add support for the
	_NET_WM_USER_TIME_WINDOW EWMH protocol; see #354213.

	WARNING: This patch will make metacity <= 2.18.0 freeze on
	workspace switch.  This is due to a weird problem that should only
	affect window managers using gdk in-process for decoration drawing
	and which make an unsafe assumption relating to doing so (i.e. it
	should only affect metacity).  Upgrade your version of metacity if
	you hit this bug.

svn path=/trunk/; revision=17574