tree a07b945fb3dc73a087207ea42c7b61db55091423
parent 821bd95bf0abd85d87d9b3aa456f4af3d2756e09
author Dake Gu <dake@google.com> 1520473893 -0800
committer Dake Gu <dake@google.com> 1520636714 -0800

DO NOT MERGE: leanback: fix setSelectedPosition

Fixed bug that setSelectedPosition should not startSmoothScroller
when requestLayout() was called.

Added complete tests to cover the all 16 combinations for
setSelectedPosition:
1. Wether there is a SmoothScroller running
2. Whether requestLayout() was called
3. setSelectionPosition or setSelectedPosiitonSmooth
4. The target position is visible or not

Removed special flag for preventing SmoothScroller.onStop() reentry
problem.

Bug: 74130178
Test: Passed GridWidgetTest
Test: added 16 tests GridWidgetTest#testSelectedPosition01~16

Change-Id: I1f4c4ac0f04d7a2f645d604d39c56264d9edc4f6