587dc283ea
I attempted to preserve the "don't draw unless different" by ditching rounding for more precise display_span, but that didn't work. An alternative solution would be to draw on adjustment change if there's text, since then we need to redraw regardless of slider position, but it seemed weird even just with respect to the slider, so I opted for this, which really definitely redraws when the adjustment changes, period. If this proves to be a performance issue we'll have to figure that out.
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