chore: unshift shortest whitespace prefix only (#33618)

packages/playwright/src/matchers/toMatchAriaSnapshot.ts

@@ -126,7 +126,6 @@ function unshift(snapshot: string): string {
     const match = line.match(/^(\s*)/);
     if (match && match[1].length < whitespacePrefixLength)
       whitespacePrefixLength = match[1].length;
-    break;
   }
   return lines.filter(t => t.trim()).map(line => line.substring(whitespacePrefixLength)).join('\n');
 }

tests/page/page-aria-snapshot.spec.ts

@@ -27,7 +27,6 @@ function unshift(snapshot: string): string {
     const match = line.match(/^(\s*)/);
     if (match && match[1].length < whitespacePrefixLength)
       whitespacePrefixLength = match[1].length;
-    break;
   }
   return lines.filter(t => t.trim()).map(line => line.substring(whitespacePrefixLength)).join('\n');
 }

tests/page/to-match-aria-snapshot.spec.ts

@@ -659,3 +659,17 @@ test('should parse attributes', async ({ page }) => {
     `);
   }
 });
+
+test('should not unshift actual template text', async ({ page }) => {
+  await page.setContent(`
+    <h1>title</h1>
+    <h1>title 2</h1>
+  `);
+  const error = await expect(page.locator('body')).toMatchAriaSnapshot(`
+        - heading "title" [level=1]
+    - heading "title 2" [level=1]
+  `, { timeout: 1000 }).catch(e => e);
+  expect(stripAnsi(error.message)).toContain(`
+    - heading "title" [level=1]
+- heading "title 2" [level=1]`);
+});