fix in-thread search. (#294)

lib/cubits/comments/comments_cubit.dart

@@ -113,6 +113,8 @@ class CommentsCubit extends Cubit<CommentsState> {
       state.copyWith(
         status: CommentsStatus.inProgress,
         comments: <Comment>[],
+        matchedComments: <int>[],
+        inThreadSearchQuery: '',
         currentPage: 0,
       ),
     );

lib/screens/item/widgets/in_thread_search_icon_button.dart

@@ -141,6 +141,7 @@ class _InThreadSearchViewState extends State<_InThreadSearchView> {
               children: <Widget>[
                 for (final int i in state.matchedComments)
                   CommentTile(
+                    index: i,
                     comment: state.comments.elementAt(i),
                     fetchMode: FetchMode.lazy,
                     actionable: false,

lib/screens/widgets/comment_tile.dart

@@ -359,7 +359,8 @@ class CommentTile extends StatelessWidget {
     final CollapseState collapseState = context.read<CollapseCubit>().state;
     final CommentsState? commentsState =
         context.tryRead<CommentsCubit>()?.state;
-    return fetchMode == FetchMode.lazy &&
+    return actionable &&
+        fetchMode == FetchMode.lazy &&
         comment.kids.isNotEmpty &&
         collapseState.collapsed == false &&
         commentsState?.commentIds.contains(comment.kids.first) == false &&