fix: delegate multi-line digit selection to visible overlay (#78)

src/main/runtime/subtitle-prefetch-runtime.test.ts

@@ -1,6 +1,9 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
-import { createResolveActiveSubtitleSidebarSourceHandler } from './subtitle-prefetch-runtime';
+import {
+  createRefreshSubtitlePrefetchFromActiveTrackHandler,
+  createResolveActiveSubtitleSidebarSourceHandler,
+} from './subtitle-prefetch-runtime';
 
 test('subtitle prefetch runtime resolves direct external subtitle sources first', async () => {
   const resolveSource = createResolveActiveSubtitleSidebarSourceHandler({
@@ -57,3 +60,43 @@ test('subtitle prefetch runtime extracts internal subtitle tracks into a stable
     cleanup: resolved?.cleanup,
   });
 });
+
+test('subtitle prefetch runtime preserves parsed cues when YouTube active track source is unresolved', async () => {
+  const calls: string[] = [];
+  const refresh = createRefreshSubtitlePrefetchFromActiveTrackHandler({
+    getMpvClient: () => ({
+      connected: true,
+      requestProperty: async (name) => {
+        if (name === 'path') return 'https://www.youtube.com/watch?v=video123';
+        if (name === 'track-list') {
+          return [
+            {
+              type: 'sub',
+              id: 4,
+              lang: 'ja',
+              title: 'Japanese',
+              external: true,
+            },
+          ];
+        }
+        if (name === 'sid') return 4;
+        return null;
+      },
+    }),
+    getLastObservedTimePos: () => 12,
+    subtitlePrefetchInitController: {
+      cancelPendingInit: () => {
+        calls.push('cancel');
+      },
+      initSubtitlePrefetch: async () => {
+        calls.push('init');
+      },
+    },
+    resolveActiveSubtitleSidebarSource: async () => null,
+    shouldKeepExistingCuesOnMissingSource: (videoPath) => videoPath.includes('youtube.com'),
+  });
+
+  await refresh();
+
+  assert.deepEqual(calls, []);
+});