Added triple clicking to select the whole message.

src/widgets/helper/ChannelView.hpp

@@ -108,7 +108,7 @@ private:
 
     void handleMouseClick(QMouseEvent *event,
                           const MessageLayoutElement *hoverLayoutElement,
-                          MessageLayout *layout);
+                          MessageLayout *layout, int &messageIndex);
     void addContextMenuItems(const MessageLayoutElement *hoveredElement,
                              MessageLayout *layout);
     int getLayoutWidth() const;
@@ -149,6 +149,7 @@ private:
     bool isRightMouseDown_ = false;
     QPointF lastPressPosition_;
     QPointF lastRightPressPosition_;
+    QTimer *clickTimer_;
 
     Selection selection_;
     bool selecting_ = false;