fix: 修复吧页面“回到顶部”无反应

app/src/main/java/com/huanchengfly/tieba/post/activities/ForumActivity.kt

@@ -496,9 +496,9 @@ class ForumActivity : BaseActivity(), View.OnClickListener, OnRefreshedListener,
                         refresh()
                     }
                     "back_to_top" -> {
-                        mAdapter?.currentFragment?.apply {
+                        mAdapter?.getItem(headerTabView.selectedTabPosition)?.apply {
                             if (this is ScrollTopable) {
-                                scrollToTop()
+                                this.scrollToTop()
                             }
                         }
                     }

app/src/main/java/com/huanchengfly/tieba/post/fragments/ForumFragment.kt

@@ -253,7 +253,9 @@ class ForumFragment : BaseFragment(), Refreshable, OnSwitchListener, ScrollTopab
     }
 
     override fun scrollToTop() {
-        virtualLayoutManager.scrollToPosition(0)
+        mRecyclerView.post {
+            virtualLayoutManager.scrollToPosition(0)
+        }
     }
 
     interface OnRefreshedListener {