Add test for for editor toggling of linked widgets

browser_tests/fixtures/components/SubgraphEditor.ts

@@ -47,13 +47,18 @@ export class SubgraphEditor {
         .filter({ hasText: options.widgetName })
     })
   }
+
+  getToggleButton(item: Locator) {
+    return item.getByTestId(TestIds.subgraphEditor.widgetToggle)
+  }
+
   async togglePromotionOnItem(item: Locator, toState?: boolean) {
-    const toggleButton = item.getByTestId(TestIds.subgraphEditor.iconEye)
+    const toggleIcon = item.getByTestId(TestIds.subgraphEditor.iconEye)
     if (toState !== undefined) {
       const expectedIcon = `icon-[lucide--eye${toState ? '-off' : ''}]`
-      await expect(toggleButton).toContainClass(expectedIcon)
+      await expect(toggleIcon).toContainClass(expectedIcon)
     }
-    await toggleButton.click()
+    await toggleIcon.click()
   }
 
   async togglePromotion(

browser_tests/tests/subgraph/subgraphPromotion.spec.ts

@@ -799,3 +799,26 @@ test('Can promote multiple previews @vue-nodes', async ({ comfyPage }) => {
     await expect(subgraph.content).toHaveCount(1)
   })
 })
+
+test('Linked widgets can not be demoted @vue-nodes', async ({ comfyPage }) => {
+  await comfyPage.workflow.loadWorkflow('subgraphs/basic-subgraph')
+  const { editor } = comfyPage.subgraph
+  const subgraphNode = comfyPage.vueNodes.getNodeLocator('2')
+
+  await test.step('Enter subgraph and link widget to input', async () => {
+    await comfyPage.vueNodes.enterSubgraph('2')
+    const ksampler = await comfyPage.vueNodes.getFixtureByTitle('KSampler')
+
+    const fromSlot = ksampler.getSlot('steps')
+    const toPos = await comfyPage.subgraph.getInputSlot().getOpenSlotPosition()
+    await fromSlot.dragTo(comfyPage.canvas, { targetPosition: toPos })
+    const isConnected = () => comfyPage.vueNodes.isSlotConnected(fromSlot)
+    await expect.poll(isConnected).toBe(true)
+
+    await comfyPage.subgraph.exitViaBreadcrumb()
+  })
+
+  await editor.open(subgraphNode)
+  const stepsItem = await editor.resolvePromotionItem({ widgetName: 'steps' })
+  await expect(editor.getToggleButton(stepsItem)).toBeDisabled()
+})