Currently it is implemented by making all characters different
text arrays.

Unit test included.

Change-Id: I850bf192cf5d978a126d3f37b1084021d37bdf30
Reviewed-on: https://gerrit.libreoffice.org/32490Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>