pass focus when moving a column to another desktop

src/lib/layout/Column.ts

@@ -21,7 +21,7 @@ class Column {
         if (targetGrid === this.grid) {
             this.grid.moveColumn(this, leftColumn);
         } else {
-            this.grid.onColumnRemoved(this, false);
+            this.grid.onColumnRemoved(this, this.isFocused());
             this.grid = targetGrid;
             targetGrid.onColumnAdded(this, leftColumn);
             for (const window of this.windows.iterator()) {
@@ -203,6 +203,14 @@ class Column {
         window.focus();
     }
 
+    public isFocused() {
+        const lastFocusedWindow = this.grid.getLastFocusedWindow();
+        if (lastFocusedWindow === null) {
+            return false;
+        }
+        return lastFocusedWindow.column === this && lastFocusedWindow.isFocused();
+    }
+
     public arrange(x: number, visibleRange: Range, forceOpaque: boolean) {
         if (this.grid.config.offScreenOpacity < 1.0 && !forceOpaque) {
             const opacity = Range.contains(visibleRange, this) ? 100 : this.grid.config.offScreenOpacity;

src/tests/flows/passFocus.ts

@@ -0,0 +1,13 @@
+tests.register("Pass focus", 1, () => {
+    const config = getDefaultConfig();
+    const { qtMock, workspaceMock, world } = init(config);
+
+    const [client0, client1, client2, client3, client4] = workspaceMock.createClients(5);
+    workspaceMock.activeWindow = client3;
+
+    workspaceMock.removeWindow(client3);
+    Assert.equal(workspaceMock.activeWindow, client2);
+
+    qtMock.fireShortcut("karousel-column-move-to-desktop-2");
+    Assert.equal(workspaceMock.activeWindow, client1);
+});

src/tests/utils/mocks/MockWorkspace.ts

@@ -50,6 +50,11 @@ class MockWorkspace {
         return this.createClientsWithFrames(...widths.map(width => new MockQmlRect(randomInt(100), randomInt(100), width, 100+randomInt(400))));
     }
 
+    public removeWindow(window: MockKwinClient) {
+        this.windowRemoved.fire(window);
+        // TODO: activate another window
+    }
+
     public resizeWindow(window: MockKwinClient, edgeResize: boolean, leftEdge: boolean, topEdge: boolean, ...deltas: QmlSize[]) {
         const frame = window.getFrameGeometryCopy();
         if (edgeResize) {