Allow focusing of inputs in booklet layouts without continuous pages

Changes:
* Prevent OutlineWidget.setItem and and BookletLayout.setPage from doing
  anything if the item/page being set is already active
* Only bind focusin handler if autoFocus option is set

Bug: 62163
Change-Id: Ib01f7f0295dec5bb75e3a797e92be1b9bfcac199
Merge "Allow focusing of inputs in booklet layouts without continuous pages"