fix issue #1181

src/widget/form/chatform.cpp

@@ -753,7 +753,7 @@ void ChatForm::onAvatarRemoved(int FriendId)
 
 void ChatForm::loadHistory(QDateTime since, bool processUndelivered)
 {
-    QDateTime now = QDateTime::currentDateTime();
+    QDateTime now = historyBaselineDate.addMSecs(-1);
 
     if (since > now)
         return;

src/widget/form/genericchatform.cpp

@@ -331,6 +331,7 @@ void GenericChatForm::clearChatArea(bool notinform)
         addSystemInfoMessage(tr("Cleared"), ChatMessage::INFO, QDateTime::currentDateTime());
 
     earliestMessage = QDateTime(); //null
+    historyBaselineDate = QDateTime::currentDateTime();
 
     emit chatAreaCleared();
 }

src/widget/form/genericchatform.h

@@ -91,6 +91,7 @@ protected:
     QPushButton *sendButton;
     ChatLog *chatWidget;
     QDateTime earliestMessage;
+    QDateTime historyBaselineDate = QDateTime::currentDateTime(); // used by HistoryKeeper to load messages from t to historyBaselineDate (excluded)
     bool audioInputFlag;
     bool audioOutputFlag;
 };