fix(forum): Fix empty pinned thread when filtering thread

CHANGELOG.md

@@ -43,6 +43,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - 帖子：修复滚动时偶现的白屏。
 - 认证：修复登录页面刷新验证码时布局抖动的问题。
 - 统计：修复积分统计中的积分值。
+- 分区：修复开启帖子筛选条件时，显示没有置顶帖的问题。
 
 ### Changed
 

lib/features/forum/bloc/forum_bloc.dart

@@ -143,7 +143,10 @@ class ForumBloc extends Bloc<ForumEvent, ForumState> with LoggerMixin {
     // When jump to other pages, pinned thread and subreddits should be
     // reserved in state.
     // Only the first page has pinned threads and subreddits.
-    if (pageNumber == 1) {
+    //
+    // If any filter options applied on current state, ignore the pinned thread
+    // result in fetched dom because none may found.
+    if (pageNumber == 1 && !state.hasFilter) {
       stickThreadList = _buildThreadList<StickThread>(
         document,
         'tsdm_stickthread',

lib/features/forum/bloc/forum_state.dart

@@ -106,4 +106,12 @@ class ForumState with ForumStateMappable {
 
   /// All available [FilterDateline] list.
   final List<FilterDateline> filterDatelineList;
+
+  /// Check if any filter option applied on current state.
+  bool get hasFilter =>
+      filterState.isFiltering() ||
+      filterTypeList.isNotEmpty ||
+      filterSpecialTypeList.isNotEmpty ||
+      filterOrderList.isNotEmpty ||
+      filterDatelineList.isNotEmpty;
 }