[backport cloud/1.40] fix: prevent infinite node resize loop in Vue mode (#9179)

Backport of #9177 to `cloud/1.40`

Automatically created by backport workflow.

Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: Amp <amp@ampcode.com>

src/lib/litegraph/src/LGraphNode.ts

@@ -4187,7 +4187,12 @@ export class LGraphNode
     // Ref: https://github.com/Comfy-Org/ComfyUI_frontend/issues/2652
     // TODO: Move the layout logic before drawing of the node shape, so we don't
     // need to trigger extra round of rendering.
-    if (y > bodyHeight) {
+    // In Vue mode, the DOM is the source of truth for node sizing — the
+    // ResizeObserver feeds measurements back to the layout store.  Allowing
+    // LiteGraph to also call setSize() here creates an infinite feedback loop
+    // (LG grows node → CSS min-height increases → textarea fills extra space →
+    // ResizeObserver reports larger size → LG grows node again).
+    if (!LiteGraph.vueNodesMode && y > bodyHeight) {
       this.setSize([this.size[0], y])
       this.graph.setDirtyCanvas(false, true)
     }

src/renderer/core/layout/sync/useLayoutSync.ts

@@ -50,8 +50,12 @@ export function useLayoutSync() {
           liteNode.size[0] !== layout.size.width ||
           liteNode.size[1] !== layout.size.height
         ) {
-          // Use setSize() to trigger onResize callback
-          liteNode.setSize([layout.size.width, layout.size.height])
+          // Update internal size directly (like position above) to avoid
+          // the size setter writing back to layoutStore with Canvas source,
+          // which would create a feedback loop through handleLayoutChange.
+          liteNode.size[0] = layout.size.width
+          liteNode.size[1] = layout.size.height
+          liteNode.onResize?.(liteNode.size)
         }
       }