E.g. in Writer create a new comment, type a word that is not in the
dictionary, then a space to trigger the spelling, and that painted the
spelling error indicator outside Paint().

Change-Id: I8f72486189e04a5596729fb52b6af39772f8e002
Reviewed-on: https://gerrit.libreoffice.org/17671Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>