Feature summary (what you would like to be able to do and where):

In order to detect when a revision has been revision deleted, there is a hook ArticleRevisionVisibilitySet. There is no equivalent hook for log items or files, which can also be revdeleted.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

Anytime an extension does something with this content, but also wants to make sure that it appropriately redacts things if the underlying data is hidden.

In particular, I want to know log item revdels for my Extension:Hashtag. I don't specificly have a need for file revdel, but i think we should be consistent here for all types of revdel.

Less clear is if there should also be a hook for hideuser, and archived revisions, files, and logs. Or maybe there should just be one hook that covers everything?