As of recently, DataUpdate objects are used to represent updates to be performed on the database when a page is changed or deleted (basically, DataUpdate is a generalization of LinksUpdate).

Currently, WikiPage::doEdit takes a list of DataUpdate objects from the ParserOutput object and applies them to the database. However, the DataUpdate could be implemented more smartly if the difference between the previous and the new revision could be used,m instead of relying solely on the new revision.

So, WikiPage::doEdit should call a function that can generate DataUpdate objects based on the (difference between) the previous and the new revision, and apply them to the database.

Conceptually, WikiPage::doEdit should have a way to determine which DataUpdates need to be performed for the current edit, instead of relying on the UpdateObjects from the ParserOutput directly.

Version: unspecified
Severity: minor