Calculates the minimum and natural height of the
areas cells with the current attributes applied. Essentially this is
the same as #GtkCellAreaClass.get_preferred_width() only for areas
that are being requested as gtk.types.SizeRequestMode.WidthForHeight.
Calculates the minimum and natural height of the areas cells with the current attributes applied. Essentially this is the same as #GtkCellAreaClass.get_preferred_width() only for areas that are being requested as gtk.types.SizeRequestMode.WidthForHeight.