fix(overlay): refresh current subtitle when enabling invisible layer

src/core/services/subtitle-processing-controller.test.ts

@@ -76,3 +76,26 @@ test('subtitle processing falls back to plain subtitle when tokenization returns
 
   assert.deepEqual(emitted, [{ text: 'fallback', tokens: null }]);
 });
+
+test('subtitle processing can refresh current subtitle without text change', async () => {
+  const emitted: SubtitleData[] = [];
+  let tokenizeCalls = 0;
+  const controller = createSubtitleProcessingController({
+    tokenizeSubtitle: async (text) => {
+      tokenizeCalls += 1;
+      return { text, tokens: [] };
+    },
+    emitSubtitle: (payload) => emitted.push(payload),
+  });
+
+  controller.onSubtitleChange('same');
+  await flushMicrotasks();
+  controller.refreshCurrentSubtitle();
+  await flushMicrotasks();
+
+  assert.equal(tokenizeCalls, 2);
+  assert.deepEqual(emitted, [
+    { text: 'same', tokens: [] },
+    { text: 'same', tokens: [] },
+  ]);
+});

src/core/services/subtitle-processing-controller.ts

@@ -9,6 +9,7 @@ export interface SubtitleProcessingControllerDeps {
 
 export interface SubtitleProcessingController {
   onSubtitleChange: (text: string) => void;
+  refreshCurrentSubtitle: () => void;
 }
 
 export function createSubtitleProcessingController(
@@ -18,6 +19,7 @@ export function createSubtitleProcessingController(
   let lastEmittedText = '';
   let processing = false;
   let staleDropCount = 0;
+  let refreshRequested = false;
   const now = deps.now ?? (() => Date.now());
 
   const processLatest = (): void => {
@@ -30,6 +32,8 @@ export function createSubtitleProcessingController(
     void (async () => {
       while (true) {
         const text = latestText;
+        const forceRefresh = refreshRequested;
+        refreshRequested = false;
         const startedAtMs = now();
 
         if (!text.trim()) {
@@ -69,7 +73,7 @@ export function createSubtitleProcessingController(
       })
       .finally(() => {
         processing = false;
-        if (latestText !== lastEmittedText) {
+        if (refreshRequested || latestText !== lastEmittedText) {
           processLatest();
         }
       });
@@ -83,5 +87,12 @@ export function createSubtitleProcessingController(
       latestText = text;
       processLatest();
     },
+    refreshCurrentSubtitle: () => {
+      if (!latestText.trim()) {
+        return;
+      }
+      refreshRequested = true;
+      processLatest();
+    },
   };
 }

src/main.ts

@@ -2972,6 +2972,9 @@ function setVisibleOverlayVisible(visible: boolean): void {
 
 function setInvisibleOverlayVisible(visible: boolean): void {
   setInvisibleOverlayVisibleHandler(visible);
+  if (visible) {
+    subtitleProcessingController.refreshCurrentSubtitle();
+  }
 }
 
 function toggleVisibleOverlay(): void {