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[WIP] Allow left sidebar to float on top of content on smaller viewports
Originally opened by @jschatz1 at !2620 (merged)
This makes left sidebar to float when viewport is smaller than 1199px putting content behind. Right sidebar if present keeps its current behaviour.
Also updates niceScroll position after finishing toggling animation of left sidebar. This is to prevent a floating custom scrollbar when we toggle the sidebar.
Fixes #12717 (closed)