get_preferred_height_for_width

Description:

public virtual void get_preferred_height_for_width (int width, out int minimum_height, out int natural_height)

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

After reset is called and/or before ever requesting the size of a `GtkCellArea`, the returned values are -1.

this	a `GtkCellAreaContext`
width	a proposed width for allocation
minimum_height	location to store the minimum height
natural_height	location to store the natural height