test: add failing test for focus mode toggle resizing properties panel

browser_tests/tests/focusMode.spec.ts

@@ -55,4 +55,30 @@ test.describe('Focus Mode', { tag: '@ui' }, () => {
     await comfyPage.setFocusMode(true)
     await expect(comfyPage.menu.sideToolbar).toBeHidden()
   })
+
+  test('Focus mode toggle preserves properties panel width', async ({
+    comfyPage
+  }) => {
+    // Open the properties panel
+    await comfyPage.actionbar.propertiesButton.click()
+    await expect(comfyPage.menu.propertiesPanel.root).toBeVisible()
+
+    // Record the initial panel width
+    const initialBox = await comfyPage.menu.propertiesPanel.root.boundingBox()
+    expect(initialBox).not.toBeNull()
+    const initialWidth = initialBox!.width
+
+    // Toggle focus mode on then off
+    await comfyPage.setFocusMode(true)
+    await comfyPage.setFocusMode(false)
+
+    // Properties panel should be visible again with the same width
+    await expect(comfyPage.menu.propertiesPanel.root).toBeVisible()
+    await expect
+      .poll(async () => {
+        const box = await comfyPage.menu.propertiesPanel.root.boundingBox()
+        return box ? Math.abs(box.width - initialWidth) : Infinity
+      })
+      .toBeLessThan(2)
+  })
 })