Versioning: invalidation of not published changes has no effect on metadatas

504 r21388

I have a site in 2 langs.

I have created a page, with a title in only one lang. I have validated this page.
With a second user, I have defined a title in the second lang
-> last modification date and last contributor have metadata have been updated
In versioning, I have invalidated not published changes
-> title in my second lang has well been invalidated, but metadata have not changed back