src/stack: Prevent duplicate signals on close button spam.

It caused GNOME crash due to bug in mutter, which was fixed in v49.

But regardless, we should not spam the close signal. Also people might
be using versions before 49.

Closes: #1794
Signed-off-by: Siddh Raman Pant <25429745+siddhpant@users.noreply.github.com>

Author: siddhpant

src/stack.ts

@@ -91,8 +91,14 @@ const TabButton = GObject.registerClass(
                 }),
             );
 
-            close_button.connect('clicked', () => {
-                window.meta.delete(global.get_current_time());
+           this._running_close = false;
+
+           close_button.connect('clicked', () => {
+               if (!this._running_close) {
+                   this._running_close = true;
+                   window.meta.delete(global.get_current_time());
+                   this._running_close = false;
+               }
             });
 
             close_button.set_x_align(Clutter.ActorAlign.END);