Multiple fixes related to copying subgraphs (#6383)

- DOMWidgets have ownership reset after a `subgraphNode.clone()`.
- Fixes Ctrl+C on a subgraphNode with a prompted prompt making the
prompt disappear.
- alt + drag uses the copy/paste pathway that deeply clones subgraphs.
- Fixed dangling references on nodes in subgraphs by updating subgraph
ids before configuration.
- Attempt to recursively resolve disconnected proxyWidgets (Can matter
when subgraphs load out of order).
- Fix Right click -> clone creating linked copies of subgraphs.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6383-Multiple-fixes-related-to-copying-subgraphs-29b6d73d365081819671ced440dde327)
by [Unito](https://www.unito.io)

src/core/graph/subgraph/proxyWidget.ts

@@ -158,7 +158,11 @@ function resolveLinkedWidget(
   const { graph, nodeId, widgetName } = overlay
   const n = getNodeByExecutionId(graph, nodeId)
   if (!n) return [undefined, undefined]
-  return [n, n.widgets?.find((w: IBaseWidget) => w.name === widgetName)]
+  const widget = n.widgets?.find((w: IBaseWidget) => w.name === widgetName)
+  //Slightly hacky. Force recursive resolution of nested widgets
+  if (widget instanceof disconnectedWidget.constructor && isProxyWidget(widget))
+    widget.computedHeight = 20
+  return [n, widget]
 }
 
 function newProxyFromOverlay(subgraphNode: SubgraphNode, overlay: Overlay) {

src/lib/litegraph/src/LGraphCanvas.ts

@@ -86,7 +86,11 @@ import {
   RenderShape,
   TitleMode
 } from './types/globalEnums'
-import type { ClipboardItems, SubgraphIO } from './types/serialisation'
+import type {
+  ClipboardItems,
+  ISerialisedNode,
+  SubgraphIO
+} from './types/serialisation'
 import type { NeverNever, PickNevers } from './types/utility'
 import type { IBaseWidget } from './types/widgets'
 import { alignNodes, distributeNodes, getBoundaryNodes } from './utils/arrange'
@@ -1772,47 +1776,24 @@ export class LGraphCanvas
     menu: ContextMenu,
     node: LGraphNode
   ): void {
-    const { graph } = node
-    if (!graph) throw new NullGraphError()
-    graph.beforeChange()
-
-    const newSelected = new Set<LGraphNode>()
-
-    const fApplyMultiNode = function (
-      node: LGraphNode,
-      newNodes: Set<LGraphNode>
-    ): void {
-      if (node.clonable === false) return
-
-      const newnode = node.clone()
-      if (!newnode) return
-
-      newnode.pos = [node.pos[0] + 5, node.pos[1] + 5]
-      if (!node.graph) throw new NullGraphError()
-
-      node.graph.add(newnode)
-      newNodes.add(newnode)
-    }
-
     const canvas = LGraphCanvas.active_canvas
-    if (
-      !canvas.selected_nodes ||
-      Object.keys(canvas.selected_nodes).length <= 1
-    ) {
-      fApplyMultiNode(node, newSelected)
-    } else {
-      for (const i in canvas.selected_nodes) {
-        fApplyMultiNode(canvas.selected_nodes[i], newSelected)
-      }
+    const nodes = canvas.selectedItems.size ? canvas.selectedItems : [node]
+
+    // Find top-left-most boundary
+    let offsetX = Infinity
+    let offsetY = Infinity
+    for (const item of nodes) {
+      if (item.pos == null)
+        throw new TypeError(
+          'Invalid node encountered on clone.  `pos` was null.'
+        )
+      if (item.pos[0] < offsetX) offsetX = item.pos[0]
+      if (item.pos[1] < offsetY) offsetY = item.pos[1]
     }
 
-    if (newSelected.size) {
-      canvas.selectNodes([...newSelected])
-    }
-
-    graph.afterChange()
-
-    canvas.setDirty(true, true)
+    canvas._deserializeItems(canvas._serializeItems(nodes), {
+      position: [offsetX + 5, offsetY + 5]
+    })
   }
 
   /**
@@ -2384,42 +2365,22 @@ export class LGraphCanvas
       node &&
       this.allow_interaction
     ) {
-      let newType = node.type
+      const items = this._deserializeItems(this._serializeItems([node]), {
+        position: node.pos
+      })
+      const cloned = items?.created[0] as LGraphNode | undefined
+      if (!cloned) return
 
-      if (node instanceof SubgraphNode) {
-        const cloned = node.subgraph.clone().asSerialisable()
+      cloned.pos[0] += 5
+      cloned.pos[1] += 5
 
-        const subgraph = graph.createSubgraph(cloned)
-        subgraph.configure(cloned)
-        newType = subgraph.id
-      }
-
-      const node_data = node.clone()?.serialize()
-      if (node_data?.type != null) {
-        // Ensure the cloned node is configured against the correct type (especially for SubgraphNodes)
-        node_data.type = newType
-        const cloned = LiteGraph.createNode(newType)
-        if (cloned) {
-          cloned.configure(node_data)
-          cloned.pos[0] += 5
-          cloned.pos[1] += 5
-
-          if (this.allow_dragnodes) {
-            pointer.onDragStart = (pointer) => {
-              graph.add(cloned, false)
-              this.#startDraggingItems(cloned, pointer)
-            }
-            pointer.onDragEnd = (e) => this.#processDraggedItems(e)
-          } else {
-            // TODO: Check if before/after change are necessary here.
-            graph.beforeChange()
-            graph.add(cloned, false)
-            graph.afterChange()
-          }
-
-          return
+      if (this.allow_dragnodes) {
+        pointer.onDragStart = (pointer) => {
+          this.#startDraggingItems(cloned, pointer)
         }
+        pointer.onDragEnd = (e) => this.#processDraggedItems(e)
       }
+      return
     }
 
     // Node clicked
@@ -3963,17 +3924,26 @@ export class LGraphCanvas
     const { created, nodes, links, reroutes } = results
 
     // const failedNodes: ISerialisedNode[] = []
+    const subgraphIdMap: Record<string, string> = {}
+    // SubgraphV2: Remove always-clone behaviour
+    //Update subgraph ids
+    for (const subgraphInfo of parsed.subgraphs)
+      subgraphInfo.id = subgraphIdMap[subgraphInfo.id] = createUuidv4()
+    const allNodeInfo: ISerialisedNode[] = [
+      parsed.nodes ? [parsed.nodes] : [],
+      parsed.subgraphs ? parsed.subgraphs.map((s) => s.nodes ?? []) : []
+    ].flat(2)
+    for (const nodeInfo of allNodeInfo)
+      if (nodeInfo.type in subgraphIdMap)
+        nodeInfo.type = subgraphIdMap[nodeInfo.type]
 
     // Subgraphs
     for (const info of parsed.subgraphs) {
-      // SubgraphV2: Remove always-clone behaviour
-      const originalId = info.id
-      info.id = createUuidv4()
-
       const subgraph = graph.createSubgraph(info)
-      subgraph.configure(info)
-      results.subgraphs.set(originalId, subgraph)
+      results.subgraphs.set(info.id, subgraph)
     }
+    for (const info of parsed.subgraphs)
+      results.subgraphs.get(info.id)?.configure(info)
 
     // Groups
     for (const info of parsed.groups) {
@@ -3985,17 +3955,6 @@ export class LGraphCanvas
       created.push(group)
     }
 
-    // Update subgraph ids with nesting
-    function updateSubgraphIds(nodes: { type: string }[]) {
-      for (const info of nodes) {
-        const subgraph = results.subgraphs.get(info.type)
-        if (!subgraph) continue
-        info.type = subgraph.id
-        updateSubgraphIds(subgraph.nodes)
-      }
-    }
-    updateSubgraphIds(parsed.nodes)
-
     // Nodes
     for (const info of parsed.nodes) {
       const node = info.type == null ? null : LiteGraph.createNode(info.type)

src/lib/litegraph/src/subgraph/SubgraphNode.ts

@@ -618,4 +618,17 @@ export class SubgraphNode extends LGraphNode implements BaseLGraph {
     // Call parent serialize method
     return super.serialize()
   }
+  override clone() {
+    const clone = super.clone()
+    // force reasign so domWidgets reset ownership
+    // eslint-disable-next-line  no-self-assign
+    this.properties.proxyWidgets = this.properties.proxyWidgets
+
+    //TODO: Consider deep cloning subgraphs here.
+    //It's the safest place to prevent creation of linked subgraphs
+    //But the frequency of clone().serialize() calls is likely to result in
+    //pollution of rootGraph.subgraphs
+
+    return clone
+  }
 }