Use idle handler for overlay key binding

Running into odd problems with the overlay/windows key breaking, hopefully
this will work around those.

svn path=/trunk/; revision=121

js/ui/main.js

@@ -3,6 +3,7 @@
 const Clutter = imports.gi.Clutter;
 const Shell = imports.gi.Shell;
 const Signals = imports.signals;
+const Mainloop = imports.mainloop;
 const Tweener = imports.tweener.tweener;
 
 const Panel = imports.ui.panel;
@@ -123,12 +124,17 @@ function start() {
     
     let display = global.screen.get_display();
     display.connect('overlay-key', function(display) {
+        // Queue an idle for this, because we're getting called
+        // out of a metacity event handler, and doing a lot of
+        // work from inside there is...iffy.
+        Mainloop.idle_add(function () {
             if (overlay.visible) {
                 hide_overlay();
             } else {
                 show_overlay();
             }
         });
+    });
 }
 
 // Used to go into a mode where all keyboard and mouse input goes to