altTab: popModal before fading out

This lets the user start typing in the newly-selected window right
away, without any characters possibly getting eaten during the
animation.

https://bugzilla.gnome.org/show_bug.cgi?id=644857

js/ui/altTab.js

@@ -376,7 +376,15 @@ AltTabPopup.prototype = {
         this.destroy();
     },
 
+    _popModal: function() {
+        if (this._haveModal) {
+            Main.popModal(this.actor);
+            this._haveModal = false;
+        }
+    },
+
     destroy : function() {
+        this._popModal();
         if (this.actor.visible) {
             Tweener.addTween(this.actor,
                              { opacity: 0,
@@ -392,8 +400,7 @@ AltTabPopup.prototype = {
     },
 
     _onDestroy : function() {
-        if (this._haveModal)
-            Main.popModal(this.actor);
+        this._popModal();
 
         if (this._thumbnails)
             this._destroyThumbnails();

js/ui/ctrlAltTab.js

@@ -281,6 +281,7 @@ CtrlAltTabPopup.prototype = {
     },
 
     _onDestroy : function() {
+        this._popModal();
         if (this._keyPressEventId)
             this.actor.disconnect(this._keyPressEventId);
         if (this._keyReleaseEventId)