fix(player): 键盘收起后保持评论输入弹窗位置

test/comment/drama_comments_sheet_test.dart

@@ -377,8 +377,9 @@ void main() {
     tester.view.viewInsets = const FakeViewPadding(bottom: 180);
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));
+    final keyboardUpBottom = tester.getBottomLeft(composer).dy;
     expect(tester.getSize(composer).height, closeTo(compactHeight, 0.1));
-    expect(tester.getBottomLeft(composer).dy, closeTo(844 - 180, 0.1));
+    expect(keyboardUpBottom, closeTo(844 - 180, 0.1));
     expect(
       tester.getBottomLeft(composerInput).dy,
       lessThanOrEqualTo(844 - 180),
@@ -388,12 +389,21 @@ void main() {
     tester.view.viewInsets = const FakeViewPadding();
     await tester.pumpAndSettle();
     expect(composer, findsOneWidget);
-    expect(tester.getBottomLeft(composer).dy, closeTo(844, 0.1));
+    expect(tester.getBottomLeft(composer).dy, closeTo(keyboardUpBottom, 0.1));
     expect(commentsSheet, findsOneWidget);
     expect(list, findsOneWidget);
     expect(placeholder, findsOneWidget);
     expect(tester.getRect(commentsSheet), sheetRect);
     expect(tester.getSize(commentsSheet).height, closeTo(sheetHeight, 0.1));
+
+    await tester.tapAt(const Offset(20, 20));
+    await tester.pumpAndSettle();
+    expect(composer, findsNothing);
+
+    await tester.tap(placeholder);
+    await tester.pumpAndSettle();
+    expect(composer, findsOneWidget);
+    expect(tester.getBottomLeft(composer).dy, closeTo(844, 0.1));
   });
 
   testWidgets('should_keep_composer_open_after_input_loses_focus', (