Bug 1898251 Comment 0 Edit History

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Placeholder for transitions/animations for opening and closing the sidebar.
This will be timeboxed work to two weeks to try to make the expanded/collapsed states of the sidebar more smooth (especially when the "always show" setting is selected and a user toggles the sideview icon). The animation of the tools and pinned tabs will be handled in a separate bug since this is higher priority.

This is the ideal state [here](https://www.figma.com/proto/ZFavpnAJee39j2mFf8U3D0/Sidebar-UX-Spec?page-id=7459%3A96013&node-id=8433-141400&viewport=1227%2C-5250%2C0.12&t=njsAO8qyj2YTXPse-1&scaling=scale-down&content-scaling=fixed&starting-point-node-id=8433%3A141438&show-proto-sidebar=1) and [here](https://www.figma.com/proto/ZFavpnAJee39j2mFf8U3D0/Sidebar-UX-Spec?page-id=7459%3A96013&node-id=8433-141400&viewport=1227%2C-5250%2C0.12&t=njsAO8qyj2YTXPse-1&scaling=scale-down&content-scaling=fixed&starting-point-node-id=8433%3A141438&show-proto-sidebar=1), and we'll try to do that while avoiding the issues Gijs flagged in [this doc](https://docs.google.com/document/d/1breHIPJQ4vV7txZz8h6eGo35bSyUqhHlQ1T3bjXqw3U/edit#heading=h.juw17yju1nu2).

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