The extension [1] changes the RC view so that any changed article is only listed *once*.
A new *option* on the preferences "Recent changes" tab is added which allows users to have
- each change (default) or - only the most recent change per changed page
shown in the RC list.
Code on GitHub, see [1] (request for MW extension repo is filed on https://www.mediawiki.org/wiki/Git/New_repositories/Requests )
[1] https://www.mediawiki.org/wiki/Extension:OnlyRecentRecentChanges