ProjectDocument: make 'sampleModel()' const

GUI/Model/Project/ProjectDocument.cpp

@@ -122,9 +122,9 @@ InstrumentModel* ProjectDocument::instrumentModel() const
     return const_cast<InstrumentModel*>(&m_instrumentModel);
 }
 
-SampleModel* ProjectDocument::sampleModel()
+SampleModel* ProjectDocument::sampleModel() const
 {
-    return &m_sampleModel;
+    return const_cast<SampleModel*>(&m_sampleModel);
 }
 
 RealModel* ProjectDocument::realModel() const

GUI/Model/Project/ProjectDocument.h

@@ -73,7 +73,7 @@ public:
     void setProjectFullPath(const QString& fullPath);
 
     InstrumentModel* instrumentModel() const;
-    SampleModel* sampleModel();
+    SampleModel* sampleModel() const;
     RealModel* realModel() const;
     JobModel* jobModel() const;
     SimulationOptionsItem* simulationOptionsItem();