When navigating to Updates -> Show Apps and then downloading an item, it
shows the download progress inline for that item. After this is
complete, it then shows a tick icon next to the item. The long term goal
should be to remove the list item from under "Show Apps" so that it is
only shown at the top of the "Updates" view. However this will require
more work. In the meantime, we can alleviate some confusion by replacing
the "Tick" icon with a button that says "Update" (like the other buttons
in the Update view).
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