http://www.soft-switch.org/fltk-bug/slider_bug.fl is a simple demonstration of
a small bug I found, which affects FLTK 1.1.10 and 1.3.0. It displays a
vertical slider with a knob and a box, and a similar slider without the box. It
also displays two similar horizontal sliders. If you adjust the sliders with
boxes everything is fine. If you adjust the ones without boxes the knob smears
across the slider, rather than being erased and redrawn.
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