[calamares] Role names for progress model

src/calamares/progresstree/ProgressTreeModel.cpp

@@ -108,3 +108,12 @@ ProgressTreeModel::rowCount( const QModelIndex& parent ) const
     const Calamares::ViewManager* vm = Calamares::ViewManager::instance();
     return vm ? vm->viewSteps().length() : 0;
 }
+
+QHash< int, QByteArray >
+ProgressTreeModel::roleNames() const
+{
+    auto h = QAbstractListModel::roleNames();
+    h.insert( ProgressTreeItemCurrentRole, "current" );
+    h.insert( ProgressTreeItemCompletedRole, "completed" );
+    return h;
+}

src/calamares/progresstree/ProgressTreeModel.h

@@ -40,6 +40,8 @@ public:
 
     QVariant data( const QModelIndex& index, int role = Qt::DisplayRole ) const override;
     int rowCount( const QModelIndex& parent = QModelIndex() ) const override;
+
+    QHash< int, QByteArray > roleNames() const override;
 };
 
 #endif  // PROGRESSTREEMODEL_H