The code that updates a section size must also update length,
otherwise saveState can end up saving inconsistent state, and
restoreState() goes to an early-return, not doing anything.
The actual bug was fixed meanwhile because _q_sectionsChanged is called
again, which recalculates length. I still see this only as a safety
measure, every other code path that changes section sizes updates length
right away.
Change-Id: I6cc16261692d93b3640afafef600a5bdff8dca0c
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
4a04eea4f4