which allows to display a value different from the original
adjustment's value.
This is sortof a hack but insanely useful to map normalized config
values to a nicer range (e.g. 0.0 -> 1.0 to 0 ->100).
The default value is 1.0 which is linear and the old behavior, values above
1.0 gives finer control in the lower portions of the range, the lower half of
the widget behaves like before doing small relative adjustments.
which allows to restrict the scale to a range that is smaller than
that of the model GtkAdjustment. This way we can enter large values in
the entry or by dragging beyond the end of the scale, but keep a
reasonably usable scale range for "normal" values.
