When a widget receives a call to the snapshot function,
it must send synthetic GtkWidgetClass.snapshot() calls
to all children. This function provides a convenient way
of doing this. A widget, when it receives a call to its
GtkWidgetClass.snapshot() function, calls
gtk_widget_snapshot_child() once for each child, passing in
the @snapshot the widget received.
gtk_widget_snapshot_child() takes care of translating the origin of
@snapshot, and deciding whether the child needs to be snapshot.
This function does nothing for children that implement GtkNative.
Snapshot the a child of @widget.
When a widget receives a call to the snapshot function, it must send synthetic GtkWidgetClass.snapshot() calls to all children. This function provides a convenient way of doing this. A widget, when it receives a call to its GtkWidgetClass.snapshot() function, calls gtk_widget_snapshot_child() once for each child, passing in the @snapshot the widget received.
gtk_widget_snapshot_child() takes care of translating the origin of @snapshot, and deciding whether the child needs to be snapshot.
This function does nothing for children that implement GtkNative.