B0004 check sometimes triggers false positives

[Shatur]

Bevy version

0.16.0

What you did

Spawned a scene with a hierarchy where children are defined before parents, and all have a Transform component.

What went wrong

This results in a false-positive warning like:

warning[B0004]: The `0vX` entity with the GlobalTransform component has a parent without GlobalTransform.

This happens because the check is implemented in this hook, which runs on insertion.

I think we should turn this check into a disableable system that iterates over entities with Added<C>.

Temporary workaround

Users can create a separate component that, on insertion, adds ChildOf using commands. This causes the check to be delayed until after all entities are spawned.

Additional information

This also happens with bevy_replicon during replication when a child is processed before its parent.