fix(kwinscript): arrange after kwin moves a window between screens

...instead of forcing it back where it was. KWin changes a window's
size before moving it between screens, so we can't react to a
geometry change by always changing it back.

src/kwinscript/controller/index.ts

@@ -77,6 +77,12 @@ export interface Controller {
    */
   onWindowResizeStart(window: EngineWindow): void;
 
+  /**
+   * React to window changing screens
+   * @param window the window whose screen has changed
+   */
+  onWindowScreenChanged(window: EngineWindow): void;
+
   /**
    * React to window resize operation end. The window
    * resize operation ends, when the users drops
@@ -336,7 +342,11 @@ export class ControllerImpl implements Controller {
 
   public onWindowGeometryChanged(window: EngineWindow): void {
     this.log.log(["onWindowGeometryChanged", { window }]);
-    this.engine.enforceSize(window);
+  }
+
+  public onWindowScreenChanged(_window: EngineWindow): void {
+    //TODO only arrange the surface the window came from and went to
+    this.engine.arrange();
   }
 
   // NOTE: accepts `null` to simplify caller. This event is a catch-all hack

src/kwinscript/driver/index.ts

@@ -370,9 +370,9 @@ export class DriverImpl implements Driver {
       }
     });
 
-    this.connect(client.screenChanged, () =>
-      this.controller.onWindowChanged(window, `screen=${client.screen}`)
-    );
+    this.connect(client.screenChanged, () => {
+      this.controller.onWindowScreenChanged(window);
+    });
 
     this.connect(client.activitiesChanged, () =>
       this.controller.onWindowChanged(