Loading Mapping --> setPaint was commented. Seems to be necesary. Also added related Label for paintId just including ProjectLabels.h

src/core/Mapping.cpp

@@ -91,8 +91,8 @@ void Mapping::read(const QDomElement& obj)
   Element::read(obj);
 
   // Read paint.
-  int paintId = obj.attribute("paintId").toInt();
-//  setPaint(MainWindow::window()->getMappingManager().getPaintById(paintId));
+  int paintId = obj.attribute(ProjectLabels::PAINT_ID).toInt();
+  setPaint(MainWindow::window()->getMappingManager().getPaintById(paintId));
 
   // Read output shape.
   _readShape(obj, true);

src/core/Mapping.h

@@ -33,6 +33,8 @@
 
 #include "MetaObjectRegistry.h"
 
+#include "ProjectLabels.h"
+
 namespace mmp {
 
 // TODO: replace by ProjectAttribute