1. For tiled rendering, don't invalidate the whole page when hiding it
2. Don't invalidate when showing a page because we've just hidden the
previous one
3. No need for invalidation when setting visible layers

Change-Id: I858401b22c95093c58ec00896fe92b766fddb6de
Reviewed-on: https://gerrit.libreoffice.org/17452Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>