Paintable.getIntrinsicHeight

Gets the preferred height the paintable would like to be displayed at.

Consumers of this interface can use this to reserve enough space to draw the paintable.

This is a purely informational value and does not in any way limit the values that may be passed to [gdk.paintable.Paintable.snapshot].

If the paintable does not have a preferred height, it returns 0. Negative values are never returned.