fix(player): 聚焦时保留评论列表并稳定焦点

test/comment/drama_comments_sheet_test.dart

@@ -247,7 +247,8 @@ void main() {
     expect(tester.widget<TextField>(input).controller?.text, isEmpty);
     expect(tester.widget<TextField>(input).focusNode?.hasFocus, isTrue);
     expect(tester.widget<TextField>(input).maxLines, 4);
-    expect(find.byKey(const Key('comment-list')), findsNothing);
+    expect(find.byKey(const Key('comment-list')), findsOneWidget);
+    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
     expect(
       tester
           .widget<TextButton>(find.byKey(const Key('comment-post')))
@@ -285,8 +286,8 @@ void main() {
     await tester.tap(find.byKey(const Key('comment-input')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('comment-list')), findsNothing);
-    expect(find.byKey(const Key('comment-count-label')), findsNothing);
+    expect(find.byKey(const Key('comment-list')), findsOneWidget);
+    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
     expect(find.byKey(const Key('comment-composer')), findsOneWidget);
     expect(find.byKey(const Key('comment-input-surface')), findsOneWidget);
     final editableAfter = tester.state<EditableTextState>(
@@ -309,7 +310,6 @@ void main() {
       isNull,
     );
     expect(tester.getSize(find.byKey(const Key('comment-post'))).height, 32);
-    expect(find.byType(IconButton), findsNothing);
     expect(find.byIcon(Icons.image_outlined), findsNothing);
     expect(find.byIcon(Icons.emoji_emotions_outlined), findsNothing);
     expect(find.byIcon(Icons.alternate_email_rounded), findsNothing);
@@ -323,24 +323,55 @@ void main() {
       isNotNull,
     );
 
+    final sheet = find.byKey(const Key('player-comments-sheet'));
+    final list = find.byKey(const Key('comment-list'));
+    final sheetTop = tester.getTopLeft(sheet).dy;
+    final listTop = tester.getTopLeft(list).dy;
     tester.view.viewInsets = const FakeViewPadding(bottom: 180);
     await tester.pump();
-    await tester.pump(const Duration(milliseconds: 160));
-    expect(find.byKey(const Key('player-comments-sheet')), findsOneWidget);
-    expect(find.byKey(const Key('comment-list')), findsNothing);
+    await tester.pump(const Duration(milliseconds: 200));
+    expect(sheet, findsOneWidget);
+    expect(list, findsOneWidget);
+    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
+    final editableDuringKeyboard = tester.state<EditableTextState>(
+      find.descendant(
+        of: find.byKey(const Key('comment-input')),
+        matching: find.byType(EditableText),
+      ),
+    );
+    expect(identical(editableAfter, editableDuringKeyboard), isTrue);
+    expect(tester.getTopLeft(sheet).dy, closeTo(sheetTop, 0.1));
+    expect(tester.getTopLeft(list).dy, closeTo(listTop, 0.1));
     expect(
-      tester.getBottomLeft(find.byKey(const Key('player-comments-sheet'))).dy,
-      closeTo(844 - 180, 0.1),
+      tester.widget<ListView>(list).padding?.resolve(TextDirection.ltr).bottom,
+      greaterThanOrEqualTo(180 + 44),
     );
     expect(
       tester.getBottomLeft(find.byKey(const Key('comment-input'))).dy,
       lessThanOrEqualTo(844 - 180),
     );
+    expect(
+      tester
+          .widget<TextField>(find.byKey(const Key('comment-input')))
+          .focusNode
+          ?.hasFocus,
+      isTrue,
+    );
 
     tester.view.viewInsets = const FakeViewPadding();
     await tester.pumpAndSettle();
-    expect(find.byKey(const Key('comment-list')), findsOneWidget);
+    expect(list, findsOneWidget);
+    expect(find.byKey(const Key('comment-count-label')), findsOneWidget);
     expect(find.byKey(const Key('comment-composer')), findsOneWidget);
+    final editableAfterKeyboard = tester.state<EditableTextState>(
+      find.descendant(
+        of: find.byKey(const Key('comment-input')),
+        matching: find.byType(EditableText),
+      ),
+    );
+    expect(identical(editableAfter, editableAfterKeyboard), isTrue);
+    expect(tester.getTopLeft(sheet).dy, closeTo(sheetTop, 0.1));
+    expect(tester.getTopLeft(list).dy, closeTo(listTop, 0.1));
     expect(
       tester
           .widget<TextField>(find.byKey(const Key('comment-input')))
@@ -353,7 +384,7 @@ void main() {
           .widget<TextField>(find.byKey(const Key('comment-input')))
           .focusNode
           ?.hasFocus,
-      isFalse,
+      isTrue,
     );
   });