Some related managers not getting set up

[aleksanb]

See discussion in #902 as well.

I still have most related managers missing after the latest upgrades to the type checker code.

The patch we used to have to apply to an older version of django-mypy was this one: HyreAS@2ec7384.

But i'm not quite sure as to how i would apply this to the current state of the code.

Some related managers do get set up, so it seems like django-mypy just gives up at a certain point and stops adding more related managers.

Our models are on the form

class MyModel(SomeMixin, SomeAbstractClassThatItselfInheritsFromModelsModel):
mode_fields = ...

I'll try to create a repro, but haven't had any luck making a reduced test case actually fail on ci before.

Update: the repro does not fail: #967 :(

This is a dump of what i get with some extra logging added:

no manager <ManyToOneRel: hyre__payment.salesorderrow> django.db.models.manager.RelatedManager TypeInfo(
  Name(django.db.models.manager.RelatedManager)
  Bases(django.db.models.manager.Manager[_T`1])
  Mro(django.db.models.manager.RelatedManager, django.db.models.manager.Manager, django.db.models.manager.BaseManager, builtins.object)
  Names(
    add
    clear
    related_val (builtins.tuple[builtins.int, ...])
    remove
    set))

When adding logging here:

Unsure where to go from here.

[flaeppe]

Closed via #993