In https://gerrit.wikimedia.org/r/c/mediawiki/core/+/867732 we generalized history tools for usage on other similar pages to support adding the thanks link (T51541). During review it was noted that we could improve how this code is organized and how data is passed around.
Some possible improvements:
- https://gerrit.wikimedia.org/r/c/mediawiki/core/+/874949
- Reduce complexity of constructor
- https://gerrit.wikimedia.org/r/c/mediawiki/core/+/874950
- Rename PagerTools to ChangeTools
- Update associated classes
- Replace mw-history-undo class with something more generic.