fix detection of full-screen windows for apps that manage their own window decorations

src/lib/world/Clients.ts

@@ -47,8 +47,8 @@ namespace Clients {
 
     export function isFullScreenGeometry(kwinClient: KwinClient) {
         const fullScreenArea = Workspace.clientArea(ClientAreaOption.FullScreenArea, kwinClient.output, getKwinDesktopApprox(kwinClient));
-        return kwinClient.clientGeometry.width === fullScreenArea.width &&
-            kwinClient.clientGeometry.height === fullScreenArea.height;
+        return kwinClient.clientGeometry.width >= fullScreenArea.width &&
+            kwinClient.clientGeometry.height >= fullScreenArea.height;
     }
 
     export function isOnVirtualDesktop(kwinClient: KwinClient, kwinDesktop: KwinDesktop) {

src/tests/utils/mocks/MockKwinClient.ts

@@ -88,7 +88,15 @@ class MockKwinClient {
                 this.frameGeometry.height - 2 * MockKwinClient.borderThickness,
             );
         } else {
-            return this.frameGeometry;
+            return runOneOf(
+                () => this.frameGeometry,
+                () => new MockQmlRect(
+                    this.frameGeometry.x - 20,
+                    this.frameGeometry.y - 20,
+                    this.frameGeometry.width + 40,
+                    this.frameGeometry.height + 40,
+                ), // some full-screen windows that manage their own window decorations can temporarily have a client geometry bigger than the screen
+            );
         }
     }