get_preferred_height

Description:

public virtual void get_preferred_height (Container container, float for_width, out float min_height_p, out float nat_height_p)

Computes the minimum and natural heights of the container according to this.

this	a LayoutManager
container	the Container using this
for_width	the width for which the height should be computed, or -1
min_height_p	return location for the minimum height of the layout, or `null`
nat_height_p	return location for the natural height of the layout, or `null`