Modifies a subclass of GtkContainerClass to automatically add and
remove the border-width setting on GtkContainer. This allows the
subclass to ignore the border width in its size request and
allocate methods. The intent is for a subclass to invoke this
in its class_init function.
gtk_container_class_handle_border_width() is necessary because it
would break API too badly to make this behavior the default. So
subclasses must "opt in" to the parent class handling border_width
for them.
Modifies a subclass of GtkContainerClass to automatically add and remove the border-width setting on GtkContainer. This allows the subclass to ignore the border width in its size request and allocate methods. The intent is for a subclass to invoke this in its class_init function. gtk_container_class_handle_border_width() is necessary because it would break API too badly to make this behavior the default. So subclasses must "opt in" to the parent class handling border_width for them.