Both View focus (which is triggered by View.requestFocus()) and IME focus
(which is internally handled inside InputMethodManager), are implemented
as delayed tasks on the UI thread. The goal here is to make sure that
InputMethodManager.showSoftInput() always gets called only after the target
EditText gained IME focus.
This requires some tricks, but is basically a solved problem with
ImeAwareEditText introduced by
I182b05d3ff59fb3b4732d60d0d5a464f0e0e0235. Here we can just reuse it.
Note that ConfirmLockPassword & ChooseLockPassword are the only ones
using ScrollToParentEditText. Latter doesn't call IMM.showSoftInput().
Fixes: 62542157
Test: Verified keyboard still shows-up on the ConfirmLock screen.
Change-Id: I892d639f3cc5d43db553b682d5278b8ce2fe72da
Replace the negative margin + inset background hack with a overriding
call to requestRectangleOnScreen, which will also make a best effort
to show all the password requirements if there are multiple of them.
Bug: 38236574
Test: Added ScrollToParentEditTextTest
Change-Id: Id570652b64434b2d0b25c231540375d93884aaa9
