fix(widgets): reuse orphaned DOM containers after undo/redo in Vue render mode

In ComfyUI Vue render mode, WidgetDOM.vue reuses its component instance
during undo/redo without re-calling mountWidgetElement(), leaving newly
created widget containers detached from the DOM.

- AutocompleteTextWidget: scan for empty containers by ID prefix and reuse
- Loras widget: scan for empty .lm-loras-container elements and reuse
- Prevent duplicate event listeners by guarding listener setup on new
  containers only
- Keep container in DOM on cleanup (clearChildren instead of remove)
  so it can be found and reused by the next factory invocation

web/comfyui/loras_widget.js

@@ -14,12 +14,31 @@ import { getStrengthStepPreference } from "./settings.js";
 export function addLorasWidget(node, name, opts, callback) {
   ensureLmStyles();
 
-  // Create container for loras
-  const container = document.createElement("div");
-  container.className = "lm-loras-container";
+  // Create container for loras — search for an empty container already
+  // in the DOM first. During undo/redo in ComfyUI Vue render mode,
+  // WidgetDOM.vue reuses its component without re-calling
+  // mountWidgetElement(), so we must reuse the existing DOM element
+  // instead of creating an orphaned replacement.
+  let container = null;
+  let reuseExisting = false;
+  const existingContainers = document.querySelectorAll('.lm-loras-container');
+  for (const el of existingContainers) {
+    if (el.children.length === 0) {
+      container = el;
+      reuseExisting = true;
+      break;
+    }
+  }
 
-  forwardMiddleMouseToCanvas(container);
-  forwardWheelToCanvas(container);
+  if (!container) {
+    container = document.createElement("div");
+    container.className = "lm-loras-container";
+  }
+
+  if (!reuseExisting) {
+    forwardMiddleMouseToCanvas(container);
+    forwardWheelToCanvas(container);
+  }
 
   // Set initial height using CSS variables approach
   const defaultHeight = 200;
@@ -29,10 +48,8 @@ export function addLorasWidget(node, name, opts, callback) {
   // scrolls when content exceeds the allocated space.
   container.style.setProperty('--comfy-widget-min-height', `${defaultHeight}px`);
 
-  if (typeof LiteGraph !== 'undefined' && LiteGraph.vueNodesMode) {
+  if (!reuseExisting && typeof LiteGraph !== 'undefined' && LiteGraph.vueNodesMode) {
     container.classList.add('lm-vue-node');
-    // Window capture-phase hook: scroll the widget instead of zooming the canvas
-    // when the wheel is over a scrollable loras list.
     enableListWheelScroll(container);
   }
 
@@ -732,9 +749,10 @@ export function addLorasWidget(node, name, opts, callback) {
   widget.callback = callback;
 
   widget.onRemove = () => {
-    container.remove(); 
+    while (container.firstChild) {
+      container.removeChild(container.firstChild);
+    }
     previewTooltip.cleanup();
-    // Remove keyboard event listener
     container.removeEventListener('keydown', handleKeyboardNavigation);
   };