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  1. Handling Python/GTK's GtkScale value-changed event.

    It took me way too long, but now I know how to handle the value-changed event of GtkScale.

    In Glade:

    1. Create a GtkScale widget. We will ID it foo_scale.
    2. In the Signals -> GtkRange -> value-changed line change the Handler field to something sensible like on_foo_scale_value_changed. That will be the name of …