Use overflow-anchor as a better fix for scrolling behaviour #48
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Some browsers (Chrome definitely) try to stop the visible portion of the page moving when there are DOM changes above/below. This messed with our virtual table because while we were resizing the padding row at the top, it would scroll down by the same amount. I couldn't find a way to disable it so I put a hack in (keep track of the scrollTop and re-set it afterwards). This worked, but it actually messed with the programatic smooth scrolling because we'd end up re-setting it during the animation and the browser would then leave it as-is (so a long smooth scroll would stop after only a few pixels).
Turns out, there is a proper way to disable it, so this removes our hack and uses that.