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This should optimize the worst layout case—when scrollables with a lot of content are first shown.
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This PR makes embedded scrollbars in a
scrollable(i.e. when usingspacing) only appear and take up space when needed.We avoid constantly relayouting twice by remembering the scrollbar "status quo" and only recalculating if the content has grown longer or shorter enough to change it. Chains of status quo changes should be very rare; therefore
layoutcan still be considered single-pass.