Merge changes from topic "staged_split_ime" into sc-dev

* changes:
  Adjust split layout with IME animation in split (5/N)
  Adjust split layout with IME animation in split (4/N)
  Adjust split layout with IME animation in split (3/N)
  Adjust split layout with IME animation in split (2/N)
  Adjust split layout with IME animation in split (1/N)