Disconnect destroyed windows and actors

tiling.js

@@ -826,6 +826,12 @@ function registerWindow(metaWindow) {
     signals.connect(metaWindow, 'notify::fullscreen', fullscreenWrapper);
     signals.connect(metaWindow, 'size-changed', resizeHandler);
     signals.connect(actor, 'show', showWrapper);
+
+    signals.connect(actor, 'destroy', destroyHandler);
+}
+
+function destroyHandler(actor) {
+    signals.disconnect(actor);
 }
 
 function cloneSizeHandler(metaWindow) {
@@ -979,6 +985,9 @@ function remove_handler(workspace, meta_window) {
         return;
     space.layout();
 
+    if (!meta_window.get_compositor_private())
+        signals.disconnect(meta_window);
+
     // (could be an empty workspace)
     if (space.selectedWindow) {
         // Force a new ensure, since the focus_handler is run before

utils.js

@@ -169,6 +169,14 @@ class Signals extends Map {
         signals.push(object.connect(signal, handler));
     }
 
+    disconnect(object) {
+        let ids = this.get(object);
+        if (ids) {
+            ids.forEach(id => object.disconnect(id));
+            this.delete(object);
+        }
+    }
+
     destroy() {
         for (let [object, signals] of this) {
             signals.forEach(id => object.disconnect(id));