Referencing squashed migrations

[Jarek Glowacki]

Greetings,

Django does not currently support designating unapplied squashed migrations as dependencies.

This feels like bad behaviour, especially since `makemigrations` will reference a squashed migration by default if it has already been applied locally.

I've made a ticket for this, along with submitting a patch that addresses the issue by recursively rerouting dependencies on an unapplied squashed migration to that migration's applicable dependent and replaced migrations.

Would really appreciate it if I could get some feedback on my approach to tackling the issue, and hopefully some thumbs up towards getting it merged! :)

Cheers,

Jarek