This function is useful only when implementing subclasses of
#GtkContainer.
Sets the container as the parent of @widget, and takes care of
some details such as updating the state and style of the child
to reflect its new location. The opposite function is
gtk_widget_unparent().
This function is useful only when implementing subclasses of #GtkContainer. Sets the container as the parent of @widget, and takes care of some details such as updating the state and style of the child to reflect its new location. The opposite function is gtk_widget_unparent().