🔧 Backport #393 to pre 45 GNOME

kwin/main.js.in

@@ -80,6 +80,12 @@ class %EFFECT_CLASS% {
             return window.hasDecoration;
         }
 
+        // This is primarily to avoid animating the AltTab popup.
+        // See https://github.com/Schneegans/Burn-My-Windows/issues/384 for details.
+        if (!window.hasDecoration && window.onAllDesktops) {
+            return false
+        }
+
         if (blacklist.indexOf(window.windowClass) != -1) {
             return false;
         }