gboolean gtk_widget_can_activate_accel ( GtkWidget* widget, guint signal_id )
Determines whether an accelerator that activates the signal
signal_id can currently be activated.
This is done by emitting the
widget; if the signal isn’t overridden by a
handler or in a derived widget, then the default check is
that the widget must be sensitive, and the widget and all
its ancestors mapped.