🪲 Fix effects in front of fullscreen windows

src/Shader.js

@@ -14,8 +14,8 @@
 
 'use strict';
 
-const {Gio, Shell, GObject, Clutter} = imports.gi;
-const ByteArray                      = imports.byteArray;
+const {Gio, Shell, GObject, Clutter, Meta} = imports.gi;
+const ByteArray                            = imports.byteArray;
 
 const Main           = imports.ui.main;
 const ExtensionUtils = imports.misc.extensionUtils;
@@ -113,6 +113,10 @@ var Shader = GObject.registerClass(
       this._timeline.set_duration(duration);
       this._timeline.start();
 
+      // Make sure that no fullscreen window is drawn over our animations.
+      Meta.disable_unredirect_for_display(global.display);
+      global.begin_work();
+
       // Reset progress value.
       this._progress = 0;
       this._testMode = testMode;
@@ -147,6 +151,10 @@ var Shader = GObject.registerClass(
         return;
       }
 
+      // Restore unredirecting behavior for fullscreen windows.
+      Meta.enable_unredirect_for_display(global.display);
+      global.end_work();
+
       this.emit('end-animation');
     }