toolkit: File revisions

ui/gtk/range.h

2017-11-10	Olaf Wintermann	refactors value binding system	file \| diff \| annotate
2016-01-27	Olaf Wintermann	added scrollbar (Motif)	file \| diff \| annotate
2016-01-27	Olaf Wintermann	added scrollbar (GTK)	file \| diff \| annotate

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