Deleting a node deletes the linked group_content entities which then resaves the node

I am still periodically running into this problem on Group 2.x when the group relationship for the deleted entity is already in the in-memory cache. Attaching a patch with the same approach as #13 for Group 2.x.

Is this automatically solved when 🐛 Node update hook is triggered upon group content create RTBC is fixed?

About to write a test.

MR237 contains test and fix, whereas MR238 only contains the test. Running the test alone should give some fatal errors or exceptions, whereas the fix should pass the test.

I had to add another fix part into group_user_delete hook implementation, as the problem is also happening when deleting a user that is the owner of some groups.

Sorry I only had the time to work on top of 3.2.x branch, needs probably a reroll for 3.3.x (and other more recent versions).

I think this will be fixed as part of 🐛 Node update hook is triggered upon group content create RTBC . I.e.: We will no longer save entities when they are added to or removed from a group.