gtk:layout-manager-allocate (layout widget width height baseline)

layout -- a gtk:layout-manager object
widget -- a gtk:widget widget using layout
width -- an integer with the new width of the widget
height -- an integer with the new height of the widget
baseline -- an integer with the baseline position of the widget, or -1

This function assigns the given width, height, and baseline to a widget, and computes the position and sizes of the children of the widget using the layout management policy of layout.