fixed selections moving when new messages come in while selecting

src/widgets/helper/channelview.hpp

@@ -86,7 +86,10 @@ private:
     bool updateQueued = false;
     bool messageWasAdded = false;
     bool lastMessageHasAlternateBackground = false;
-    bool paused = false;
+    bool pausedTemporarily = false;
+    bool pausedBySelection = false;
+    bool scrollToBottomAfterTemporaryPause = false;
+    int messagesAddedSinceSelectionPause = 0;
     QTimer pauseTimeout;
     boost::optional<messages::MessageElement::Flags> overrideFlags;
     messages::MessageLayoutPtr lastReadMessage;
@@ -99,6 +102,10 @@ private:
     void drawMessages(QPainter &painter);
     void setSelection(const messages::SelectionItem &start, const messages::SelectionItem &end);
     messages::MessageElement::Flags getFlags() const;
+    bool isPaused();
+
+    void beginPause();
+    void endPause();
 
     ChannelPtr channel;