Returns the current focus child widget inside @container. This is not the currently focused widget. That can be obtained by calling gtk_window_get_focus().
The child widget which will receive the focus inside @container when the @container is focused, or %NULL if none is set.
2.14
See Implementation
Returns the current focus child widget inside @container. This is not the currently focused widget. That can be obtained by calling gtk_window_get_focus().