Fill reply history windows at boundaries and preserve read position

tools/chatgui/src/messagelist.cpp

@@ -676,8 +676,6 @@ void MessageList::loadChannel(const QString& channelId) {
     QWidget* prevFocus = QApplication::focusWidget();
 
     bool sameChannel = (m_currentChannelId == channelId);
-    if (!sameChannel) m_historyAnchor.clear();
-    m_view->setHistoricalWindow(!m_historyAnchor.isEmpty());
 
     /* Save state of current channel before switching */
     if (!m_currentChannelId.isEmpty()) {
@@ -699,6 +697,8 @@ void MessageList::loadChannel(const QString& channelId) {
         }
     }
 
+    if (!sameChannel) m_historyAnchor.clear();
+    m_view->setHistoricalWindow(!m_historyAnchor.isEmpty());
     m_model->clear();
     m_avatarCache.clear();
     if (m_currentChannelId != channelId) { m_feedback.clear(); m_pendingPoll.clear(); }
@@ -869,6 +869,7 @@ void MessageList::refresh() {
 }
 
 void MessageList::saveChannelState() {
+    if (!m_historyAnchor.isEmpty()) return; // Просмотр цитаты сохраняет прежнюю позицию чтения свежей истории.
     if (m_currentChannelId.isEmpty() || m_model->rowCount() == 0) return;
 
     QScrollBar* sb = m_view->verticalScrollBar();
@@ -922,6 +923,7 @@ void MessageList::reloadLocalNicks() {
         quint64 nid = v.value<quint64>();
         item->setData(authorName(nid), MsgAuthorRole);
     }
+    if (!isDmChannel(m_currentChannelId)) refreshReplies();
     m_view->viewport()->update();
 }
 
@@ -947,6 +949,7 @@ void MessageList::restoreScrollPosition(const QString& channelId) {
 }
 
 void MessageList::updateReadPosition() {
+    if (!m_historyAnchor.isEmpty()) return;
     if (m_currentChannelId.isEmpty() || m_model->rowCount() == 0) return;
 
     int vpHeight = m_view->viewport()->height();