message: qt, refactor: Use default arguments for overridden functions
  See Qt docs for QAbstractTableModel and QAbstractItemModel classes.
diff: @@ -61,11 +61,11 @@ public:
  /** @name Methods overridden from QAbstractTableModel
  @{*/
  - int rowCount(const QModelIndex &parent) const override;
  - int columnCount(const QModelIndex &parent) const override;
  - QVariant data(const QModelIndex &index, int role) const override;
  - QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
  - QModelIndex index(int row, int column, const QModelIndex &parent) const override;
  + int rowCount(const QModelIndex& parent = QModelIndex()) const override;
  + int columnCount(const QModelIndex& parent = QModelIndex()) const override;
  + QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
  + QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
  + QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const override;
  Qt::ItemFlags flags(const QModelIndex &index) const override;
  /*@}*/
  