less generic type

GUI/View/Canvas/ProjectionsEditorCanvas.cpp

@@ -155,7 +155,7 @@ void ProjectionsEditorCanvas::onActivityChanged(MaskFlags::MaskMode mask_mode)
     onLeavingColorMap();
 }
 
-void ProjectionsEditorCanvas::onLineItemMoved(OverlayItem* sender)
+void ProjectionsEditorCanvas::onLineItemMoved(LineItem* sender)
 {
     if (dynamic_cast<HorizontalLineItem*>(sender)
         && (m_currentActivity != MaskFlags::VERTICAL_LINE_MODE))

GUI/View/Canvas/ProjectionsEditorCanvas.h

@@ -24,7 +24,6 @@ class Data2DItem;
 class LineItem;
 class MaskGraphicsScene;
 class MaskGraphicsView;
-class OverlayItem;
 class PlotStatusLabel;
 
 //! Holds a graphics scene to draw projections on top of ColorMap. Being a part
@@ -56,7 +55,7 @@ public slots:
     void onActivityChanged(MaskFlags::MaskMode mask_mode);
 
 private:
-    void onLineItemMoved(OverlayItem* sender);
+    void onLineItemMoved(LineItem* sender);
     void setColorMap(ColorMap* colorMap);
     void setConnected(bool isConnected);