MBS-6087: Show relationship edits for recordings on release edit list

[reosarevok]

https://tickets.metabrainz.org/browse/MBS-6087

[yvanzo]

It shows the edit in /open_edits but it still doesn’t set class mp on any entity of the relationship in the tracklist. Tests would be welcome.

[mwiencek]

The lack of an mp class seems unrelated to MBS-6087? A separate ticket might be better for that.

[reosarevok]

Unrelated and tricky (since we'd want to only select the specific relationship somehow - is this a thing we can do in any reasonable way at the moment? do we have edits_pending for specific relationships? If we do, then we need a ticket and I can look into it at some point too)

[mwiencek]

There should be a way by overriding alter_edit_pending, but it's not something we do for relationships in general, so I'm not sure it makes sense to create an exception here unless we do it for all. For example, if you're to currently add or edit or remove a relationship, we don't even increment edits_pending for the entities on the relationship, let alone indirect entities (like releases using a particular recording). Perhaps that's something we want, but it's a separate issue at least.

[yvanzo]

Edits history works fine.

Created ticket MBS-10284 accordingly.