Avoid FloatingToolbar flickers

by:
 1. Restricting 'moving hide' -- where we hide the toolbar if the
    toolbar is moving.
 2. Hide the toolbar when transitioning to 'select all' -- where the
    toolbar is refreshed.

Bug: 32910217
Bug: 30418276
Test: bit FrameworksCoreTests:android.widget.TextViewActivityTest
bit CtsWidgetTestCases:android.widget.cts.TextViewTest

Change-Id: I1f44ee765d74bbcf08e6e7cd635f76d1e8f6305b