get_preferred_height

Description:

public void get_preferred_height (out int minimum_height, out int natural_height)

Gets the accumulative preferred height for all rows which have been requested with this context.

After reset is called and/or before ever requesting the size of a `GtkCellArea`, the returned values are 0.

this	a `GtkCellAreaContext`
minimum_height	location to store the minimum height
natural_height	location to store the natural height