Keep accumulator previews stable when reordered

loop_nodes.py

@@ -54,6 +54,14 @@ INDEX_SWITCH_MISSING_BEHAVIORS = ["fallback", "none", "clamp", "wrap"]
 _ACCUMULATOR_STORES: dict[str, list[dict[str, Any]]] = {}
 
 
+def _entry_preview_key(entry: dict[str, Any]) -> str:
+    key = str(entry.get("_sxcp_preview_key") or "").strip()
+    if not key:
+        key = f"entry_{random.getrandbits(64):016x}"
+        entry["_sxcp_preview_key"] = key
+    return key
+
+
 class AnyType(str):
     def __ne__(self, _other: object) -> bool:
         return False
@@ -218,6 +226,7 @@ def _entry_infos(store: list[dict[str, Any]]) -> list[dict[str, Any]]:
             {
                 "index": index,
                 "id": str(entry.get("id") or ""),
+                "preview_key": _entry_preview_key(entry),
                 "has_image": image is not None,
                 "has_metadata": has_metadata,
                 "shape": list(shape) if shape is not None else [],
@@ -424,7 +433,13 @@ def _preview_image_results(
         metadata = _metadata_for_entry(entry, prompt, extra_pnginfo)
         file = f"{filename}_{counter:05}_.png"
         _image_to_pil(image).save(os.path.join(full_output_folder, file), pnginfo=metadata, compress_level=1)
-        results.append({"filename": file, "subfolder": subfolder, "type": "temp"})
+        results.append({
+            "filename": file,
+            "subfolder": subfolder,
+            "type": "temp",
+            "preview_key": _entry_preview_key(entry),
+            "entry_id": str(entry.get("id") or ""),
+        })
         counter += 1
     return results