Don't use highlighting in non-selectable text. Also fixes potential...

Don't use highlighting in non-selectable text. Also fixes potential discrepancy in indexes for Linkified entities.

Test: atest CtsWidgetTestCases:TextViewTest FrameworksCoreTests:android.widget.TextViewActivityTest CtsViewTestCases:android.view.textclassifier.cts.TextClassificationManagerTest FrameworksCoreTests:android.view.textclassifier.TextLinksTest

Change-Id: Ib479afa9af2b921e6a217a34322a766561867b79
(cherry picked from commit bda1d9e7)