Update litegraph to 0.7.26 (#161)

* Update litegraph

* Test node order

* Update test expectations [skip ci]

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Co-authored-by: github-actions <github-actions@github.com>

tests-ui/tests/litegraph.test.ts

@@ -0,0 +1,40 @@
+import { LiteGraph } from "@comfyorg/litegraph";
+import { LGraph } from "@comfyorg/litegraph";
+import { LGraphNode } from "@comfyorg/litegraph";
+
+function swapNodes(nodes: LGraphNode[]) {
+  const firstNode = nodes[0];
+  const lastNode = nodes[nodes.length - 1];
+  nodes[0] = lastNode;
+  nodes[nodes.length - 1] = firstNode;
+  return nodes;
+}
+
+function createGraph(...nodes: LGraphNode[]) {
+  const graph = new LGraph();
+  nodes.forEach((node) => graph.add(node));
+  return graph;
+}
+
+class DummyNode extends LGraphNode {
+  constructor() {
+    super();
+  }
+}
+
+describe("LGraph", () => {
+  it("should serialize deterministic node order", async () => {
+    LiteGraph.registerNodeType("dummy", DummyNode);
+    const node1 = new DummyNode();
+    const node2 = new DummyNode();
+    const graph = createGraph(node1, node2);
+
+    const result1 = graph.serialize();
+    expect(result1.nodes).not.toHaveLength(0);
+    // @ts-ignore
+    graph._nodes = swapNodes(graph._nodes);
+    const result2 = graph.serialize();
+
+    expect(result1).toEqual(result2);
+  });
+});