95c87f87fa
Add black backgrounds to each item display, as well as a black background with a full-screen height to the workspaces display. Update the expanded item display up front when 'More...' is clicked, and reveal the additional items gradually when the other components of the overlay slide away. Raise the documents display up gradually as the applications display above it slides away. Reverse the process when 'Less...' is clicked. First, gradually cover up additional items by other components, and then update the displays to contain fewer items.
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