fix(widgets): collapse duplicate COLOR widget rendering on Color to RGB Int (FE-842) (#12447)

## Summary

Fix the duplicate \`<WidgetColorPicker>\` rendering on the \`Color to
RGB Int\` node (and any other COLOR-using V3 node that the runtime
double-registers a widget for).
<img width="480" alt="after-fix-dedupe-proof"
src="https://github.com/user-attachments/assets/5c801806-ed5d-493f-92b6-e0b99dd8e408"
/>

## Changes

- **What**:
- \`useProcessedWidgets.getWidgetIdentity\`: fall back to the host
\`nodeId\` parameter for the dedupe identity root when neither
\`storeNodeId/widget.nodeId\` nor \`sourceExecutionId\` is set. Normal
root-graph widgets now dedupe identically to promoted/execution-scoped
widgets, so any duplicate same-name+same-type widget collapses to one
render. \`sourceExecutionId\` precedence is preserved.
- \`useColorWidget\`: read top-level \`default\` from the V2 spec (falls
back to nested \`options.default\` for hand-authored V2 specs), and
short-circuit if a same-name color widget already exists on
\`node.widgets\` so a second \`addWidget('color', …)\` call from
upstream hooks (or a \`configure\` round-trip) no longer duplicates the
row.
- **Tests**:
- New \`useColorWidget.test.ts\` covers top-level default,
nested-options fallback, no-default fallback, and the idempotency guard.
- \`useProcessedWidgets.test.ts\` gets a regression case for two
identical color widgets on the same node collapsing to one render, plus
an updated \`getWidgetIdentity\` case for the host-nodeId fallback.

## Review Focus

- \`getWidgetIdentity\` precedence change. The fallback only fires when
none of \`storeNodeId\`, \`widget.nodeId\`, or \`sourceExecutionId\` are
present, so promoted/exec-scoped widgets (incl. the \"unresolved
same-name promoted entries distinct by source execution identity\"
\`NodeWidgets\` test) are unaffected.
- \`useColorWidget\` idempotency guard is defensive — the root cause of
the second \`addWidget\` call (cloud-only hook or persisted
\`info.widgets\` configure round-trip) is not in this diff; that's
tracked separately.

Fixes
[FE-842](https://linear.app/comfyorg/issue/FE-842/color-to-rgb-int-node-shows-duplicate-color-widgets)

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

@@ -12,19 +12,22 @@ test.describe('Vue Widget Reactivity', { tag: '@vue-nodes' }, () => {
     await comfyPage.page.evaluate(() => {
       const graph = window.graph as TestGraphAccess
       const node = graph._nodes_by_id['4']
-      node.widgets!.push(node.widgets![0])
+      node.widgets!.push({ ...node.widgets![0], name: 'added_widget_1' })
     })
     await expect(loadCheckpointNode).toHaveCount(2)
     await comfyPage.page.evaluate(() => {
       const graph = window.graph as TestGraphAccess
       const node = graph._nodes_by_id['4']
-      node.widgets![2] = node.widgets![0]
+      node.widgets![2] = { ...node.widgets![0], name: 'added_widget_2' }
     })
     await expect(loadCheckpointNode).toHaveCount(3)
     await comfyPage.page.evaluate(() => {
       const graph = window.graph as TestGraphAccess
       const node = graph._nodes_by_id['4']
-      node.widgets!.splice(0, 0, node.widgets![0])
+      node.widgets!.splice(0, 0, {
+        ...node.widgets![0],
+        name: 'added_widget_3'
+      })
     })
     await expect(loadCheckpointNode).toHaveCount(4)
   })

src/renderer/extensions/vueNodes/composables/useProcessedWidgets.test.ts

@@ -54,15 +54,30 @@ describe('getWidgetIdentity', () => {
     expect(renderKey).toBe(dedupeIdentity)
   })
 
-  it('returns transient renderKey for widgets without stable identity', () => {
+  it('falls back to host nodeId so duplicate normal widgets dedupe', () => {
     const widget = createMockWidget({
       nodeId: undefined,
       storeNodeId: undefined,
       sourceExecutionId: undefined
     })
     const { dedupeIdentity, renderKey } = getWidgetIdentity(widget, '5', 3)
+    expect(dedupeIdentity).toBe('node:5:test_widget:test_widget:combo')
+    expect(renderKey).toBe(dedupeIdentity)
+  })
+
+  it('returns transient renderKey when no nodeId is available at all', () => {
+    const widget = createMockWidget({
+      nodeId: undefined,
+      storeNodeId: undefined,
+      sourceExecutionId: undefined
+    })
+    const { dedupeIdentity, renderKey } = getWidgetIdentity(
+      widget,
+      undefined,
+      3
+    )
     expect(dedupeIdentity).toBeUndefined()
-    expect(renderKey).toBe('transient:5:test_widget:test_widget:combo:3')
+    expect(renderKey).toBe('transient::test_widget:test_widget:combo:3')
   })
 
   it('uses sourceExecutionId for identity when no nodeId', () => {
@@ -360,6 +375,46 @@ describe('computeProcessedWidgets borderStyle', () => {
     expect(result).toHaveLength(1)
     expect(result[0].hidden).toBe(false)
   })
+
+  it('collapses duplicate normal widgets on the same node to one render', () => {
+    const colorA = createMockWidget({
+      name: 'color',
+      type: 'color',
+      nodeId: undefined,
+      storeNodeId: undefined,
+      sourceExecutionId: undefined
+    })
+    const colorB = createMockWidget({
+      name: 'color',
+      type: 'color',
+      nodeId: undefined,
+      storeNodeId: undefined,
+      sourceExecutionId: undefined
+    })
+
+    const result = computeProcessedWidgets({
+      nodeData: {
+        id: '1',
+        type: 'ColorToRGBInt',
+        widgets: [colorA, colorB],
+        title: 'Color to RGB Int',
+        mode: 0,
+        selected: false,
+        executing: false,
+        inputs: [],
+        outputs: []
+      },
+      graphId: 'graph-test',
+      showAdvanced: false,
+      isGraphReady: false,
+      rootGraph: null,
+      ui: noopUi
+    })
+
+    expect(result).toHaveLength(1)
+    expect(result[0].name).toBe('color')
+    expect(result[0].renderKey).toBe('node:1:color:color:color')
+  })
 })
 
 describe('createWidgetUpdateHandler (via computeProcessedWidgets)', () => {

src/renderer/extensions/vueNodes/composables/useProcessedWidgets.ts

@@ -129,11 +129,15 @@ export function getWidgetIdentity(
   const rawWidgetId = widget.storeNodeId ?? widget.nodeId
   const storeWidgetName = widget.storeName ?? widget.name
   const slotNameForIdentity = widget.slotName ?? widget.name
+  const hostNodeIdRoot =
+    nodeId !== undefined && nodeId !== ''
+      ? `node:${String(stripGraphPrefix(nodeId))}`
+      : undefined
   const stableIdentityRoot = rawWidgetId
     ? `node:${String(stripGraphPrefix(rawWidgetId))}`
     : widget.sourceExecutionId
       ? `exec:${widget.sourceExecutionId}`
-      : undefined
+      : hostNodeIdRoot
 
   const dedupeIdentity = stableIdentityRoot
     ? `${stableIdentityRoot}:${storeWidgetName}:${slotNameForIdentity}:${widget.type}`

src/renderer/extensions/vueNodes/widgets/composables/useColorWidget.test.ts

@@ -0,0 +1,76 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import type { LGraphNode } from '@/lib/litegraph/src/litegraph'
+import type {
+  IColorWidget,
+  IWidgetOptions
+} from '@/lib/litegraph/src/types/widgets'
+import type { InputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
+import { useColorWidget } from '@/renderer/extensions/vueNodes/widgets/composables/useColorWidget'
+
+function createMockNode(): LGraphNode {
+  const widgets: IColorWidget[] = []
+  const addWidget = vi.fn(
+    (
+      type: string,
+      name: string,
+      value: string,
+      _callback: () => void,
+      options: IWidgetOptions
+    ) => {
+      const widget = {
+        type,
+        name,
+        value,
+        options,
+        callback: _callback
+      } as unknown as IColorWidget
+      widgets.push(widget)
+      return widget
+    }
+  )
+
+  return { widgets, addWidget } as unknown as LGraphNode
+}
+
+const colorSpec: InputSpec = {
+  type: 'COLOR',
+  name: 'color',
+  default: '#ffffff',
+  socketless: true
+}
+
+describe('useColorWidget', () => {
+  it('reads the top-level default from the V2 spec', () => {
+    const node = createMockNode()
+    const widget = useColorWidget()(node, colorSpec)
+    expect(widget.value).toBe('#ffffff')
+  })
+
+  it('falls back to nested options.default when top-level default is absent', () => {
+    const node = createMockNode()
+    const widget = useColorWidget()(node, {
+      type: 'COLOR',
+      name: 'color',
+      options: { default: '#abcdef' }
+    } as InputSpec)
+    expect(widget.value).toBe('#abcdef')
+  })
+
+  it('falls back to #000000 when no default is declared', () => {
+    const node = createMockNode()
+    const widget = useColorWidget()(node, {
+      type: 'COLOR',
+      name: 'color'
+    } as InputSpec)
+    expect(widget.value).toBe('#000000')
+  })
+
+  it('returns the existing widget instead of creating a duplicate', () => {
+    const node = createMockNode()
+    const first = useColorWidget()(node, colorSpec)
+    const second = useColorWidget()(node, colorSpec)
+    expect(second).toBe(first)
+    expect(node.widgets).toHaveLength(1)
+  })
+})

src/renderer/extensions/vueNodes/widgets/composables/useColorWidget.ts

@@ -8,8 +8,14 @@ import type { ComfyWidgetConstructorV2 } from '@/scripts/widgets'
 
 export const useColorWidget = (): ComfyWidgetConstructorV2 => {
   return (node: LGraphNode, inputSpec: InputSpecV2): IColorWidget => {
-    const { name, options } = inputSpec as ColorInputSpec
-    const defaultValue = options?.default || '#000000'
+    const colorSpec = inputSpec as ColorInputSpec
+    const { name, options } = colorSpec
+    const defaultValue = colorSpec.default ?? options?.default ?? '#000000'
+
+    const existing = node.widgets?.find(
+      (w): w is IColorWidget => w.name === name && w.type === 'color'
+    )
+    if (existing) return existing
 
     const widget = node.addWidget('color', name, defaultValue, () => {}, {
       serialize: true