Make nodeData.widgets reactive (#6019)

Makes the litegraph `node.widgets` array `shallowReactive` and makes the
`nodeData.widgets` a `reactiveComputed` derived from the litegraph
widget data.

![reactive-widgets](https://github.com/user-attachments/assets/8eb8d712-8586-4f34-b699-30fc3dc3340b)


Making changes to the structure of litegraph items is somewhat
dangerous, but code search verifies that there are no custom nodes using
`defineProperty` on `node.widgets`

This fixes display of promoted widgets on subgraph node and any custom
nodes that dynamically add or remove widgets.

TODO:
- Investigate occasional dropped widgets.
- Some of this was confusion with `canvasOnly` widgets and widgets not
implemented in vue. Will keep investigating, but I'm not terribly
concerned with actual test cases and it being an objective improvement.
  
Known Issue:
- Node does not grow/shrink to fit changed widgets

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6019-Make-nodeData-widgets-reactive-2896d73d3650815691b6ee370a86a22c)
by [Unito](https://www.unito.io)

browser_tests/tests/vueNodes/widgets/widgetReactivity.spec.ts

@@ -0,0 +1,51 @@
+import {
+  comfyExpect as expect,
+  comfyPageFixture as test
+} from '../../../fixtures/ComfyPage'
+
+test.describe('Vue Widget Reactivity', () => {
+  test.beforeEach(async ({ comfyPage }) => {
+    await comfyPage.setSetting('Comfy.VueNodes.Enabled', true)
+    await comfyPage.vueNodes.waitForNodes()
+  })
+  test('Should display added widgets', async ({ comfyPage }) => {
+    const loadCheckpointNode = comfyPage.page.locator(
+      'css=[data-testid="node-body-4"] > .lg-node-widgets > div'
+    )
+    await comfyPage.page.evaluate(() => {
+      const node = window['graph']._nodes_by_id['4']
+      node.widgets.push(node.widgets[0])
+    })
+    await expect(loadCheckpointNode).toHaveCount(2)
+    await comfyPage.page.evaluate(() => {
+      const node = window['graph']._nodes_by_id['4']
+      node.widgets[2] = node.widgets[0]
+    })
+    await expect(loadCheckpointNode).toHaveCount(3)
+    await comfyPage.page.evaluate(() => {
+      const node = window['graph']._nodes_by_id['4']
+      node.widgets.splice(0, 0, node.widgets[0])
+    })
+    await expect(loadCheckpointNode).toHaveCount(4)
+  })
+  test('Should hide removed widgets', async ({ comfyPage }) => {
+    const loadCheckpointNode = comfyPage.page.locator(
+      'css=[data-testid="node-body-3"] > .lg-node-widgets > div'
+    )
+    await comfyPage.page.evaluate(() => {
+      const node = window['graph']._nodes_by_id['3']
+      node.widgets.pop()
+    })
+    await expect(loadCheckpointNode).toHaveCount(5)
+    await comfyPage.page.evaluate(() => {
+      const node = window['graph']._nodes_by_id['3']
+      node.widgets.length--
+    })
+    await expect(loadCheckpointNode).toHaveCount(4)
+    await comfyPage.page.evaluate(() => {
+      const node = window['graph']._nodes_by_id['3']
+      node.widgets.splice(0, 1)
+    })
+    await expect(loadCheckpointNode).toHaveCount(3)
+  })
+})

src/composables/graph/useGraphNodeManager.ts

@@ -2,13 +2,15 @@
  * Vue node lifecycle management for LiteGraph integration
  * Provides event-driven reactivity with performance optimizations
  */
-import { reactive } from 'vue'
+import { reactiveComputed } from '@vueuse/core'
+import { reactive, shallowReactive } from 'vue'
 
 import { useChainCallback } from '@/composables/functional/useChainCallback'
 import type {
   INodeInputSlot,
   INodeOutputSlot
 } from '@/lib/litegraph/src/interfaces'
+import type { IBaseWidget } from '@/lib/litegraph/src/types/widgets'
 import { useLayoutMutations } from '@/renderer/core/layout/operations/layoutMutations'
 import { LayoutSource } from '@/renderer/core/layout/types'
 import type { InputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
@@ -132,44 +134,57 @@ export function useGraphNodeManager(graph: LGraph): GraphNodeManager {
       })
     })
 
-    const safeWidgets = node.widgets?.map((widget) => {
-      try {
-        // TODO: Use widget.getReactiveData() once TypeScript types are updated
-        let value = widget.value
-
-        // For combo widgets, if value is undefined, use the first option as default
-        if (
-          value === undefined &&
-          widget.type === 'combo' &&
-          widget.options?.values &&
-          Array.isArray(widget.options.values) &&
-          widget.options.values.length > 0
-        ) {
-          value = widget.options.values[0]
-        }
-        const spec = nodeDefStore.getInputSpecForWidget(node, widget.name)
-        const slotInfo = slotMetadata.get(widget.name)
-
-        return {
-          name: widget.name,
-          type: widget.type,
-          value: value,
-          label: widget.label,
-          options: widget.options ? { ...widget.options } : undefined,
-          callback: widget.callback,
-          spec,
-          slotMetadata: slotInfo,
-          isDOMWidget: isDOMWidget(widget)
-        }
-      } catch (error) {
-        return {
-          name: widget.name || 'unknown',
-          type: widget.type || 'text',
-          value: undefined
-        }
+    const reactiveWidgets = shallowReactive<IBaseWidget[]>(node.widgets ?? [])
+    Object.defineProperty(node, 'widgets', {
+      get() {
+        return reactiveWidgets
+      },
+      set(v) {
+        reactiveWidgets.splice(0, reactiveWidgets.length, ...v)
       }
     })
 
+    const safeWidgets = reactiveComputed<SafeWidgetData[]>(
+      () =>
+        node.widgets?.map((widget) => {
+          try {
+            // TODO: Use widget.getReactiveData() once TypeScript types are updated
+            let value = widget.value
+
+            // For combo widgets, if value is undefined, use the first option as default
+            if (
+              value === undefined &&
+              widget.type === 'combo' &&
+              widget.options?.values &&
+              Array.isArray(widget.options.values) &&
+              widget.options.values.length > 0
+            ) {
+              value = widget.options.values[0]
+            }
+            const spec = nodeDefStore.getInputSpecForWidget(node, widget.name)
+            const slotInfo = slotMetadata.get(widget.name)
+
+            return {
+              name: widget.name,
+              type: widget.type,
+              value: value,
+              label: widget.label,
+              options: widget.options ? { ...widget.options } : undefined,
+              callback: widget.callback,
+              spec,
+              slotMetadata: slotInfo,
+              isDOMWidget: isDOMWidget(widget)
+            }
+          } catch (error) {
+            return {
+              name: widget.name || 'unknown',
+              type: widget.type || 'text',
+              value: undefined
+            }
+          }
+        }) ?? []
+    )
+
     const nodeType =
       node.type ||
       node.constructor?.comfyClass ||