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The update policy of a Range widget defines at what points during
user interaction it will change the value field of its
Gtk::Adjustment and emit the value_changed signal. The update policies, set with the set_update_policy() method, are:
Gtk::UPDATE_CONTINUOUS - This is the default. The
value_changed signal is emitted continuously, i.e. whenever the
slider is moved by even the tiniest amount.
Gtk::UPDATE_DISCONTINUOUS - The value_changed signal is
only emitted once the slider has stopped moving and the user has
released the mouse button.
Gtk::UPDATE_DELAYED - The value_changed signal is emitted
when the user releases the mouse button, or if the slider stops moving
for a short period of time.
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