release: publish v2.0.19 sidebar interaction fixes

Restore the shared sliding-selection transition after React StrictMode effect restarts, disable redundant service filters, add regression coverage, and update the public English changelog and package metadata for v2.0.19.

tests/downloads-view.test.tsx

@@ -486,6 +486,16 @@ describe("downloads view", () => {
     expect(html.match(/data-sliding-selection-active="true"/g)).toHaveLength(1);
   });
 
+  it("disables the service filter until more than one concrete service is available", () => {
+    const none = renderToStaticMarkup(<DownloadsSidebar actions={createActions()} model={withRuntime(createInput(), { providerOptions: [] })} />);
+    const one = renderToStaticMarkup(<DownloadsSidebar actions={createActions()} model={withRuntime(createInput(), { providerOptions: [{ id: "rapidgator", label: "RapidGator" }] })} />);
+    const multiple = renderToStaticMarkup(<DownloadsSidebar actions={createActions()} model={withRuntime(createInput(), { providerOptions: [{ id: "rapidgator", label: "RapidGator" }, { id: "ddownload", label: "DDownload" }] })} />);
+
+    expect(none).toMatch(/<select[^>]*aria-label="Service filtern"[^>]*disabled=""/);
+    expect(one).toMatch(/<select[^>]*aria-label="Service filtern"[^>]*disabled=""/);
+    expect(multiple).not.toMatch(/<select[^>]*aria-label="Service filtern"[^>]*disabled=""/);
+  });
+
   it("shows only the package mode while the file mode remains hidden", () => {
     const html = renderToStaticMarkup(<DownloadsSidebar actions={createActions()} model={withRuntime(createInput())} />);
     const css = fs.readFileSync(path.join(process.cwd(), "src/renderer/views/downloads/downloads.css"), "utf8");

tests/sliding-selection.test.ts

@@ -1,6 +1,34 @@
 import { describe, expect, it } from "vitest";
 
 describe("sliding selection scheduling", () => {
+  it("re-arms transitions when a StrictMode effect cleanup cancels the first frame", async () => {
+    const selectionModule = await import("../src/renderer/ui/SlidingSelection");
+    const schedule = Reflect.get(selectionModule, "scheduleSelectionTransitions");
+
+    expect(schedule).toBeTypeOf("function");
+
+    let transitionsEnabled = false;
+    let nextFrame = 0;
+    const pending = new Map<number, FrameRequestCallback>();
+    const requestFrame = (callback: FrameRequestCallback): number => {
+      nextFrame += 1;
+      pending.set(nextFrame, callback);
+      return nextFrame;
+    };
+    const cancelFrame = (frame: number): void => {
+      pending.delete(frame);
+    };
+
+    const firstFrame = schedule(false, 0, () => { transitionsEnabled = true; }, requestFrame, cancelFrame);
+    cancelFrame(firstFrame);
+    const secondFrame = schedule(false, 0, () => { transitionsEnabled = true; }, requestFrame, cancelFrame);
+
+    expect(transitionsEnabled).toBe(false);
+    expect(pending.has(firstFrame)).toBe(false);
+    pending.get(secondFrame)?.(0);
+    expect(transitionsEnabled).toBe(true);
+  });
+
   it("applies the first mounted selection before scheduling later movements", async () => {
     const selectionModule = await import("../src/renderer/ui/SlidingSelection");
     const schedule = Reflect.get(selectionModule, "scheduleSelectionLayout");