GtkWidget::remove_accelerators
void remove_accelerators(string accel_signal, bool visible_only);
remove_accelerators() is a way
to remove any number of accelerators belonging to the calling widget
and causing the given signal to be fired. The second parameter toggles
whether this should include all such accelerators, or only those
displayed on the GtkAccelLabel.
Note that the accelerators on the widget need to be unlocked before
this method will work.
