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.