Ref T13516. Hide this UI on devices without the screen width to reasonably support it.
- Maniphest Tasks
- T13516: Remove the "filetree" setting (so it's always enabled for everyone)
- rP4793bfcb7c49: Don't show the "file tree" view on tablets/phones
Viewed a revision at various window widths, saw the elements vanish at device widths and reappear at desktop widths.