fix(overlay): show all secondary subtitle lines

- Remove the secondary subtitle height and overflow clipping
- Update coverage to allow long subtitle stacks

changes/remove-secondary-subtitle-display-limit.md

@@ -0,0 +1,4 @@
+type: fixed
+area: overlay
+
+- Secondary subtitle overlays now show every rendered line instead of clipping text after roughly four lines.

src/renderer/style.css

@@ -1928,10 +1928,6 @@ body.layer-modal #overlay {
   text-align: center;
   font-size: 24px;
   line-height: 1.5;
-  /* Backstop: pathological tracks (karaoke typesetting, sign spam) must never grow
-     the hover-pause band beyond a top strip. ~4 lines at line-height 1.5. */
-  max-height: 6em;
-  overflow: hidden;
   color: #ffffff;
   -webkit-text-stroke: 0.45px rgba(0, 0, 0, 0.7);
   paint-order: stroke fill;

src/renderer/subtitle-render.test.ts

@@ -1490,13 +1490,13 @@ test('prepareSecondarySubtitleLines strips ASS override tags and handles empty i
   assert.deepEqual(prepareSecondarySubtitleLines('{\\an8}'), []);
 });
 
-test('secondary subtitle root CSS caps height so hover-pause band stays a top strip', () => {
+test('secondary subtitle root CSS does not clip long subtitle stacks', () => {
   const srcCssPath = path.join(process.cwd(), 'src', 'renderer', 'style.css');
   const cssText = fs.readFileSync(srcCssPath, 'utf-8');
 
   const secondaryRootBlock = extractClassBlock(cssText, '#secondarySubRoot');
-  assert.match(secondaryRootBlock, /max-height:\s*6em;/);
+  assert.doesNotMatch(secondaryRootBlock, /max-height\s*:/);
-  assert.match(secondaryRootBlock, /overflow:\s*hidden;/);
+  assert.doesNotMatch(secondaryRootBlock, /overflow\s*:\s*hidden/);
 });
 
 test('applySubtitleStyle sets known-word maturity color variables', () => {