LayoutChild 
    abstract class LayoutChild(val gtkLayoutChildPointer: <Error class: unknown class><<Error class: unknown class>>)(source)
GtkLayoutChild is the base class for objects that are meant to hold layout properties.
If a GtkLayoutManager has per-child properties, like their packing type, or the horizontal and vertical span, or the icon name, then the layout manager should use a GtkLayoutChild implementation to store those properties.
A GtkLayoutChild instance is only ever valid while a widget is part of a layout.
Inheritors
Constructors
Types
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                  class LayoutChildImpl(pointer: <Error class: unknown class><<Error class: unknown class>>) : LayoutChild
The LayoutChildImpl type represents a native instance of the abstract LayoutChild class.