Python内核代码移除，建模界面缩放bug修复

frontend/tests/e2e/fit-view.spec.ts

@@ -257,18 +257,18 @@ test("普通滚轮纵向平移，Ctrl 滚轮缩放且滚动条和中键拖动保
   await expect
     .poll(async () => (await readModelingViewport(page)).zoom)
     .not.toBeCloseTo(beforeZoom.zoom, 2);
-  const horizontalAfterZoom = await horizontalScrollbar.evaluate(
-    (element) => element.scrollLeft,
-  );
-  const verticalAfterZoom = await verticalScrollbar.evaluate(
-    (element) => element.scrollTop,
-  );
-  expect(
-    Math.hypot(
+  await expect.poll(async () => {
+    const horizontalAfterZoom = await horizontalScrollbar.evaluate(
+      (element) => element.scrollLeft,
+    );
+    const verticalAfterZoom = await verticalScrollbar.evaluate(
+      (element) => element.scrollTop,
+    );
+    return Math.hypot(
       horizontalAfterZoom - horizontalBeforeZoom,
       verticalAfterZoom - verticalBeforeZoom,
-    ),
-  ).toBeGreaterThan(1);
+    );
+  }).toBeGreaterThan(1);
 
   const beforeMiddleDrag = await readModelingViewport(page);
   await page.mouse.move(pointer.x, pointer.y);
@@ -404,6 +404,67 @@ test("导入大型工程 JSON 后非接触连线端点与端口保持对齐", as
 
 });
 
+test("大型工程连续缩放时滚动条不逐帧重排且停稳后同步", async ({ page }) => {
+  await prepareApp(page);
+  await page.goto("/");
+  await page.locator('input[type="file"]').setInputFiles(MQL_8_PROJECT_PATH);
+  await expectAllNodesInsideCanvas(page, ".flow-canvas", mql8Project.nodes.length);
+  await expect(page.getByRole("scrollbar", { name: "水平滚动画布" }))
+    .toHaveAttribute("aria-valuemax", /[1-9]/);
+
+  const changes = await page.evaluate(async () => {
+    const canvas = document.querySelector<HTMLElement>(".flow-canvas")!;
+    const pane = canvas.querySelector<HTMLElement>(".react-flow__pane")!;
+    const viewport = canvas.querySelector<HTMLElement>(".react-flow__viewport")!;
+    const scrollbars = canvas.querySelector<HTMLElement>(".flow-viewport-scrollbars")!;
+    const bounds = canvas.getBoundingClientRect();
+    let viewportChanges = 0;
+    let scrollbarChanges = 0;
+    const observer = new MutationObserver((mutations) => {
+      for (const mutation of mutations) {
+        if (mutation.target === viewport) viewportChanges++;
+        if (scrollbars.contains(mutation.target)) scrollbarChanges++;
+      }
+    });
+    observer.observe(viewport, { attributes: true, attributeFilter: ["style"] });
+    observer.observe(scrollbars, {
+      attributes: true, attributeFilter: ["style"], subtree: true,
+    });
+    // 连续输入覆盖整个手势，避免驱动侧等待导致其被拆成多个独立缩放。
+    for (let index = 0; index < 12; index++) {
+      pane.dispatchEvent(new WheelEvent("wheel", {
+        bubbles: true, cancelable: true, ctrlKey: true, deltaY: -8,
+        clientX: bounds.x + bounds.width / 2,
+        clientY: bounds.y + bounds.height / 2,
+      }));
+      await new Promise<void>((resolve) => requestAnimationFrame(() => resolve()));
+    }
+    observer.disconnect();
+    return { viewportChanges, scrollbarChanges };
+  });
+  expect(changes.viewportChanges).toBeGreaterThan(5);
+  expect(changes.scrollbarChanges).toBeLessThan(changes.viewportChanges / 2);
+
+  await expect.poll(async () => {
+    const viewport = await readModelingViewport(page);
+    const scale = await page.locator(".flow-canvas").evaluate((canvas) =>
+      Number(canvas.style.getPropertyValue("--port-handle-hit-scale")),
+    );
+    return Math.abs(scale * viewport.zoom - 1);
+  }).toBeLessThan(0.01);
+  const alignment = await readVisibleEdgeEndpointAlignment(page, mql8Project.edges);
+  expect(alignment.missingHandles).toEqual([]);
+  expect(alignment.checkedEdgeCount).toBeGreaterThan(20);
+  expect(alignment.maxDistance).toBeLessThanOrEqual(4);
+  const zoom = (await readModelingViewport(page)).zoom;
+  const horizontal = page.getByRole("scrollbar", { name: "水平滚动画布" });
+  await horizontal.focus();
+  const before = await readModelingViewport(page);
+  await horizontal.press("ArrowRight");
+  await expect.poll(async () => (await readModelingViewport(page)).x).toBeLessThan(before.x);
+  expect((await readModelingViewport(page)).zoom).toBeCloseTo(zoom, 5);
+});
+
 test("恢复自动保存工程后自动适配建模画布", async ({ page }) => {
   await prepareApp(page);
   await page.addInitScript((project) => {