def METHOD_NAME(self, topLeft, bottomRight):
    if topLeft.parent() != QModelIndex() and \
       topLeft.column() <= PlotStep.name <= bottomRight.column() and \
       self._showSubPlot:
        # Name's of Step has been updated, we update Items if showing
        # subplots.
        self.updateItems()
    elif topLeft.parent() != QModelIndex():
        return
    if topLeft.column() <= Plot.name <= bottomRight.column():
        # Update name
        self.updateNames()
    elif topLeft.column() <= Plot.importance <= bottomRight.column():
        # Importance changed
        self.updateItems()