AutoMoveWindows: try harder to get an application for a window

First of all, remove windows that are not interesting (like popup
menus and tooltips). Then, queue once an idle if the app is null,
in the hope that ShellWindowTracker picks up the window.

extensions/auto-move-windows/extension.js

@@ -32,10 +32,24 @@ WindowMover.prototype = {
         }
     },
 
-    _findAndMove: function(display, window) {
+    _findAndMove: function(display, window, noRecurse) {
+	if (!this._windowTracker.is_window_interesting(window))
+	    return;
+
 	let spaces = this._settings.get_strv(SETTINGS_KEY);
 
 	let app = this._windowTracker.get_window_app(window);
+	if (!app) {
+	    if (!noRecurse) {
+		// window is not tracked yet
+		Mainloop.idle_add(Lang.bind(this, function() {
+		    this._findAndMove(display, window, true);
+		    return false;
+		}));
+	    } else
+		log ('Cannot find application for window');
+	    return;
+	}
 	let app_id = app.get_id();
         for ( let j = 0 ; j < spaces.length; j++ ) {
             let apps_to_space = spaces[j].split(":");