Commit ac8bf47f authored by Ell's avatar Ell

libgimpwidgets: control GimpSpinButton scroll increments using modifiers

In GimpSpinButton, adjust the scroll step in response to modifiers:
normal scrolling uses the step increment, Ctrl uses the page
increment, and Shift scales the step increment down by the ratio
between the page and step increments (up to the minimal precision
of the spin button).

This applies to all spin buttons used in GIMP, including spin
scales.
parent 90022de2
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