OverlayLayout 
    open class OverlayLayout(val gtkOverlayLayoutPointer: <Error class: unknown class><<Error class: unknown class>>) : LayoutManager(source)
GtkOverlayLayout is the layout manager used by class@Gtk.Overlay.
It places widgets as overlays on top of the main child.
This is not a reusable layout manager, since it expects its widget to be a GtkOverlay. It is only listed here so that its layout properties get documented.
Constructors
Functions
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                  open fun allocate(widget: Widget, width: <Error class: unknown class>, height: <Error class: unknown class>, baseline: <Error class: unknown class>)
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 @manager.
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                  Retrieves a GtkLayoutChild instance for the GtkLayoutManager, creating one if necessary.
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                  Retrieves the request mode of @manager.
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                  Queues a resize on the GtkWidget using @manager, if any.