Fix SaveAs (#5643)

Implementing subgraph blueprints (#5139) included changes to saving to
ensure that SaveAs generates a new workflow of the correct type. However
this code failed to utilize the pre-prepared state when performing the
actual save. This produced a couple of problems with both failing to
detach the workflow and failing to apply the correct state

This error is only encountered when using Save As from a non temporary
workflow (one loaded from the workflows sidebar tab).

As this state calculation code is only used in this code path, it has
been moved into the saveAs function of the workflowStore.

Resolves #5592

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5643-Fix-SaveAs-2726d73d3650818faa7af449d1f13c26)
by [Unito](https://www.unito.io)

src/platform/workflow/management/stores/workflowStore.ts

@@ -20,7 +20,7 @@ import {
   parseNodeExecutionId,
   parseNodeLocatorId
 } from '@/types/nodeIdentification'
-import { getPathDetails } from '@/utils/formatUtil'
+import { generateUUID, getPathDetails } from '@/utils/formatUtil'
 import { syncEntities } from '@/utils/syncUtil'
 import { isSubgraph } from '@/utils/typeGuardUtil'
 
@@ -320,12 +320,19 @@ export const useWorkflowStore = defineStore('workflow', () => {
     existingWorkflow: ComfyWorkflow,
     path: string
   ): ComfyWorkflow => {
+    // Generate new id when saving existing workflow as a new file
+    const id = generateUUID()
+    const state = JSON.parse(
+      JSON.stringify(existingWorkflow.activeState)
+    ) as ComfyWorkflowJSON
+    state.id = id
+
     const workflow: ComfyWorkflow = new (existingWorkflow.constructor as any)({
       path,
       modified: Date.now(),
       size: -1
     })
-    workflow.originalContent = workflow.content = existingWorkflow.content
+    workflow.originalContent = workflow.content = JSON.stringify(state)
     workflowLookup.value[workflow.path] = workflow
     return workflow
   }