test: add Playwright tests for FormDropdown positioning

Amp-Thread-ID: https://ampcode.com/threads/T-019d2285-317d-75db-b838-15f7d9b55b3c
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/fixtures/selectors.ts

@@ -100,7 +100,8 @@ export const TestIds = {
     decrement: 'decrement',
     increment: 'increment',
     domWidgetTextarea: 'dom-widget-textarea',
-    subgraphEnterButton: 'subgraph-enter-button'
+    subgraphEnterButton: 'subgraph-enter-button',
+    formDropdownMenu: 'form-dropdown-menu'
   },
   builder: {
     footerNav: 'builder-footer-nav',

browser_tests/tests/vueNodes/widgets/load/formDropdownPosition.spec.ts

@@ -0,0 +1,124 @@
+import {
+  comfyExpect as expect,
+  comfyPageFixture as test
+} from '../../../../fixtures/ComfyPage'
+import { TestIds } from '../../../../fixtures/selectors'
+
+test.describe(
+  'FormDropdown positioning in Vue nodes',
+  { tag: ['@widget', '@node'] },
+  () => {
+    test.beforeEach(async ({ comfyPage }) => {
+      await comfyPage.settings.setSetting('Comfy.VueNodes.Enabled', true)
+      await comfyPage.workflow.loadWorkflow('widgets/load_image_widget')
+      await comfyPage.vueNodes.waitForNodes()
+    })
+
+    test('dropdown menu appears directly below the trigger', async ({
+      comfyPage
+    }) => {
+      const node = comfyPage.vueNodes.getNodeByTitle('Load Image')
+      await expect(node).toBeVisible()
+
+      const trigger = node.locator(
+        'button:has(> span > span), button:has(i.icon-\\[lucide--chevron-down\\])'
+      )
+      await trigger.first().click()
+
+      const menu = comfyPage.page.getByTestId(TestIds.widgets.formDropdownMenu)
+      await expect(menu).toBeVisible({ timeout: 5000 })
+
+      const triggerBox = await trigger.first().boundingBox()
+      const menuBox = await menu.boundingBox()
+
+      expect(triggerBox).toBeTruthy()
+      expect(menuBox).toBeTruthy()
+
+      // Menu top should be near the trigger bottom (within 20px tolerance for padding)
+      expect(menuBox!.y).toBeGreaterThanOrEqual(
+        triggerBox!.y + triggerBox!.height - 5
+      )
+      expect(menuBox!.y).toBeLessThanOrEqual(
+        triggerBox!.y + triggerBox!.height + 20
+      )
+
+      // Menu left should be near the trigger left (within 10px tolerance)
+      expect(menuBox!.x).toBeGreaterThanOrEqual(triggerBox!.x - 10)
+      expect(menuBox!.x).toBeLessThanOrEqual(triggerBox!.x + 10)
+    })
+
+    test('dropdown menu appears correctly at different zoom levels', async ({
+      comfyPage
+    }) => {
+      for (const zoom of [0.5, 1.5]) {
+        // Set zoom via canvas
+        await comfyPage.page.evaluate((scale) => {
+          const canvas = window.app!.canvas
+          canvas.ds.scale = scale
+          canvas.setDirty(true, true)
+        }, zoom)
+        await comfyPage.nextFrame()
+
+        const node = comfyPage.vueNodes.getNodeByTitle('Load Image')
+        await expect(node).toBeVisible()
+
+        const trigger = node.locator(
+          'button:has(i.icon-\\[lucide--chevron-down\\])'
+        )
+        await trigger.first().click()
+
+        const menu = comfyPage.page.getByTestId(
+          TestIds.widgets.formDropdownMenu
+        )
+        await expect(menu).toBeVisible({ timeout: 5000 })
+
+        const triggerBox = await trigger.first().boundingBox()
+        const menuBox = await menu.boundingBox()
+
+        expect(triggerBox).toBeTruthy()
+        expect(menuBox).toBeTruthy()
+
+        // Menu top should still be near trigger bottom regardless of zoom
+        expect(menuBox!.y).toBeGreaterThanOrEqual(
+          triggerBox!.y + triggerBox!.height - 5
+        )
+        expect(menuBox!.y).toBeLessThanOrEqual(
+          triggerBox!.y + triggerBox!.height + 20 * zoom
+        )
+
+        // Close dropdown before next iteration
+        await comfyPage.page.keyboard.press('Escape')
+        await expect(menu).not.toBeVisible()
+      }
+    })
+
+    test('dropdown closes on outside click', async ({ comfyPage }) => {
+      const node = comfyPage.vueNodes.getNodeByTitle('Load Image')
+      const trigger = node.locator(
+        'button:has(i.icon-\\[lucide--chevron-down\\])'
+      )
+      await trigger.first().click()
+
+      const menu = comfyPage.page.getByTestId(TestIds.widgets.formDropdownMenu)
+      await expect(menu).toBeVisible({ timeout: 5000 })
+
+      // Click outside the node
+      await comfyPage.page.mouse.click(10, 10)
+      await expect(menu).not.toBeVisible()
+    })
+
+    test('dropdown closes on Escape key', async ({ comfyPage }) => {
+      const node = comfyPage.vueNodes.getNodeByTitle('Load Image')
+      const trigger = node.locator(
+        'button:has(i.icon-\\[lucide--chevron-down\\])'
+      )
+      await trigger.first().click()
+
+      const menu = comfyPage.page.getByTestId(TestIds.widgets.formDropdownMenu)
+      await expect(menu).toBeVisible({ timeout: 5000 })
+
+      await comfyPage.page.keyboard.press('Escape')
+      await expect(menu).not.toBeVisible()
+    })
+  }
+)

src/renderer/extensions/vueNodes/widgets/components/form/dropdown/FormDropdownMenu.vue

@@ -97,6 +97,7 @@ const virtualItems = computed<VirtualDropdownItem[]>(() =>
 
 <template>
   <div
+    data-testid="form-dropdown-menu"
     class="flex h-[640px] w-103 flex-col rounded-lg bg-component-node-background pt-4 outline -outline-offset-1 outline-node-component-border"
     data-capture-wheel="true"
   >