fix: prevent slug id from overwriting migrated UUID via changeTracker.reset

ChangeTracker.reset(state) clones the argument into activeState
unconditionally, so passing the raw incoming workflowData on the
same-path reuse path could overwrite a freshly-migrated UUID with the
slug id that was on disk, negating the migration on the next save.

Wrap the two reset call sites in a withMigratedId helper that preserves
a valid incoming UUID and otherwise substitutes the existing UUID (or a
fresh one) so reset can never write a non-UUID id back. Strengthen the
slug-vs-UUID reuse test to assert the reset payload, and add a both-
sides-legacy-slug test plus an explicit pass-through test for the
common matching-UUID case.

src/platform/workflow/core/services/workflowService.test.ts

@@ -530,8 +530,8 @@ describe('useWorkflowService', () => {
     })
 
     it('should reuse active workflow when the incoming id is a legacy slug and existing id is a fresh UUID', async () => {
-      existingWorkflow.changeTracker.activeState.id =
-        '9cea40bb-b0cf-4b40-a758-8935cfe8d52f'
+      const existingUuid = '9cea40bb-b0cf-4b40-a758-8935cfe8d52f'
+      existingWorkflow.changeTracker.activeState.id = existingUuid
 
       await useWorkflowService().afterLoadNewGraph('repeat', {
         id: 'video-point-prompt-example',
@@ -539,7 +539,9 @@ describe('useWorkflowService', () => {
       } as never)
 
       expect(workflowStore.openWorkflow).toHaveBeenCalledWith(existingWorkflow)
-      expect(existingWorkflow.changeTracker.reset).toHaveBeenCalled()
+      expect(existingWorkflow.changeTracker.reset).toHaveBeenCalledWith(
+        expect.objectContaining({ id: existingUuid })
+      )
       expect(existingWorkflow.changeTracker.restore).toHaveBeenCalled()
       expect(workflowStore.createNewTemporary).not.toHaveBeenCalled()
     })
@@ -554,6 +556,26 @@ describe('useWorkflowService', () => {
 
       expect(workflowStore.openWorkflow).toHaveBeenCalledWith(existingWorkflow)
       expect(workflowStore.createNewTemporary).not.toHaveBeenCalled()
+      const resetArg = vi.mocked(existingWorkflow.changeTracker.reset).mock
+        .calls[0][0]
+      expect(resetArg?.id).toMatch(
+        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i
+      )
+      expect(resetArg?.id).not.toBe('different-legacy-name')
+    })
+
+    it('should pass through the incoming UUID id to changeTracker.reset on same-path reuse', async () => {
+      const sharedUuid = '9cea40bb-b0cf-4b40-a758-8935cfe8d52f'
+      existingWorkflow.changeTracker.activeState.id = sharedUuid
+
+      await useWorkflowService().afterLoadNewGraph('repeat', {
+        id: sharedUuid,
+        nodes: [{ id: 1, type: 'TestNode', pos: [0, 0], size: [100, 100] }]
+      } as never)
+
+      expect(existingWorkflow.changeTracker.reset).toHaveBeenCalledWith(
+        expect.objectContaining({ id: sharedUuid })
+      )
     })
   })
 

src/platform/workflow/core/services/workflowService.ts

@@ -51,6 +51,21 @@ function normalizeWorkflowIdForReuse(id: unknown): string | undefined {
   return isValidUuid(id) ? id : undefined
 }
 
+/**
+ * Returns the workflow payload with a UUID-shaped `id`, preserving the
+ * existing one when valid and otherwise substituting `fallbackId` (or a fresh
+ * UUID). Used before passing data to `ChangeTracker.reset` so a slug id on the
+ * incoming payload cannot overwrite the migrated UUID already stored on the
+ * reused workflow.
+ */
+function withMigratedId(
+  workflowData: ComfyWorkflowJSON,
+  fallbackId: string | undefined
+): ComfyWorkflowJSON {
+  if (isValidUuid(workflowData.id)) return workflowData
+  return { ...workflowData, id: fallbackId ?? generateUUID() }
+}
+
 export const useWorkflowService = () => {
   const settingStore = useSettingStore()
   const workflowStore = useWorkflowStore()
@@ -505,7 +520,9 @@ export const useWorkflowService = () => {
               ) ?? freshLoadMode
             trackIfEnteringApp(loadedWorkflow)
           }
-          loadedWorkflow.changeTracker.reset(workflowData)
+          loadedWorkflow.changeTracker.reset(
+            withMigratedId(workflowData, existingId)
+          )
           loadedWorkflow.changeTracker.restore()
           return
         }
@@ -526,7 +543,12 @@ export const useWorkflowService = () => {
       loadedWorkflow.initialMode = freshLoadMode
       trackIfEnteringApp(loadedWorkflow)
     }
-    loadedWorkflow.changeTracker.reset(workflowData)
+    loadedWorkflow.changeTracker.reset(
+      withMigratedId(
+        workflowData,
+        normalizeWorkflowIdForReuse(loadedWorkflow.activeState?.id)
+      )
+    )
     loadedWorkflow.changeTracker.restore()
   }