We kindly ask to add the Two-Column-Edit-Conflict-Merge extension to the list of "gated extensions". Means, all changes made to core will trigger the TwoColConflict tests as well, and make the CI fail when a patch would break something in the extension.
Reasoning: We plan to enable the TwoColConflict interface on all Wikimedia wikis by default. As of now it's already enabled on German Wikipedia and a few more (see T244863), and available as a Beta-Feature on all other wikis.
- Mark slow tests as such, if needed.
- Do we need to document this somewhere?