implement shrinkable scrollbar #2732
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This PR adds the ability to let the scrollbar shrink if the scrollbar is neither hovered nor dragged. This behavior only affects the drawing and not the layout or anything else. So the hover area is not affected.
By default, this is disabled but can be enabled with the
shrinking_scrollbarfunction. The default behavior is defined in thescrollbar_shrink_factorfield of theScrollable.An advantage of a shrinking scrollbar is, beside subjective design, that the scrollbar hides less content.