Fix some more divider/ime interractions

Fixes the following issues:
- Opening an app, then going to recents and putting it into split
  wasn't going to minimized.
- Compose thing in secondary split would leave split in weird state

Also added several debug logs behind a variable for easier
debugging in future.

Bug: 151181674
Bug: 151060730
Test: Open an already-open app from recents into split-screen.
      Cancel opening IME partway by defocusing editfield.
Change-Id: I4de4c3e543504087eae2458ca62d08c155899397