Revert "Don't apply ime adjustments/dims if split is not active"

Revert submission 10602670

Reason for revert: Breaks WM pre-submit
Reverted Changes:
I68f1b47e0:Some clean-up of divider code in preparation for b...
Ifcac72f0f:Don't apply ime adjustments/dims if split is not a...

Bug: 151053107
Change-Id: Ie599188debabc3e58ad37141edaba7fab7f7d8eb