I'm loving the new migrate edit UI and the ability for uses to edit the mappings. I notice that based on #2017951: Overriding UI configuration using code there is a revert button, which is great, but there is no way for a user to see what is overridden, or if anything at all is overridden for that matter.

It would be great to have some kind of UI presentation that allows users to see which migrations they have overridden the mappings for and which are default.