See <https://issues.oasis-open.org/browse/OFFICE-4105>, the proposal is
to include the gutter in the left/top/right margin to have better
backwards compatibility, at the price of more complex xmloff code.
This works by increasing the left/top/right margin on export (so even if
gutter margin is ignored at import time, the layout will look fine, just
the editing will be poor) and decreasing on import.
Change-Id: I852e5c7366e8641abd61e136f9390466585953fa
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113464
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins
Miklos Vajna
f3cf833f70