PR #4322 is now part of Leo's "devel" branch. This PR:
- Removes three unused methods and moves them to the attic.
- Removes three unused vars that Leo previously injected into various widgets.
- Improves one annotation.
- Adds comments to all remaining `Widget = Any` annotations explaining why `Any` is correct.
This PR is unlikely to cause problems. Please let me know if I am mistaken.
Edward