+ const

GUI/Model/Project/ProjectDocument.cpp

@@ -354,8 +354,8 @@ ProjectDocument::ReadResult ProjectDocument::readProject(QIODevice* device,
             itemWithMaterial->setMaterialModel(materialModel());
 
     // make a sanity check whether all materials are present
-    for (auto* multiLayerItem : m_applicationModels.sampleModel()->multiLayerItems())
-        for (auto* itemWithMaterial : multiLayerItem->itemsWithMaterial())
+    for (const auto* multiLayerItem : m_applicationModels.sampleModel()->multiLayerItems())
+        for (const auto* itemWithMaterial : multiLayerItem->itemsWithMaterial())
             if (itemWithMaterial->materialItem() == nullptr) {
                 QString message = QString("Material link is broken (id: '%1')")
                                       .arg(itemWithMaterial->materialIdentifier());