Disable double cursor for BiDi in Layout.

-- Disabled double cursor for BiDi in Layout.getCursorPath.
-- Add tests in LayoutTest.

Bug: 112875662
Test: Manual (no more double cursors, bidi editing feels OK)
Test: bit FrameworksCoreTests:android.text.LayoutTest
Change-Id: I3d201734d12f59724fa627b06ba9ca8c307c27fb
3 files changed