gdk:toplevel-present (toplevel layout)

toplevel -- a gdk:toplevel object to show
layout -- a gdk:toplevel-layout instance used to layout

Present toplevel after having processed the gtk:toplevel-layout rules. If the toplevel was previously not showing, it will be showed, otherwise it will change layout according to layout.

GDK may emit the "compute-size" signal to let the user of this toplevel compute the preferred size of the toplevel surface. See "compute-size" signal for details.

Presenting is asynchronous and the specified layout parameters are not guaranteed to be respected.