In the desktop case we invalidate up to the right side of the visible
area, however in the tiled rendering case we need to take care to
invalidate also cached tiles.

Change-Id: I7290ff35c155fab6bda3ce8b5d9c765624507052
Reviewed-on: https://gerrit.libreoffice.org/39728Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>