Sets, or unsets if @child is %NULL, the focused child of @container.
This function emits the GtkContainer::set_focus_child signal of
@container. Implementations of #GtkContainer can override the
default behaviour by overriding the class closure of this signal.
This is function is mostly meant to be used by widgets. Applications can use
gtk_widget_grab_focus() to manualy set the focus to a specific widget.
Sets, or unsets if @child is %NULL, the focused child of @container.
This function emits the GtkContainer::set_focus_child signal of @container. Implementations of #GtkContainer can override the default behaviour by overriding the class closure of this signal.
This is function is mostly meant to be used by widgets. Applications can use gtk_widget_grab_focus() to manualy set the focus to a specific widget.