`EntityHashSet` can't be used as a relationship target collection because it doesn't implement `VisitEntitiesMut`
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A-ECS
C-Bug
C-Usability
- Dominant language
- Rust
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Description
## Bevy version
Main branch https://github.com/bevyengine/bevy/commit/3b9e2e640f41fcc7c83dc477161e1b6b96764585
## What you did
- Tried to implement `RelationshipSourceCollection` for `EntityIndexMap`.
- Encountered error.
- Attempted to use `EntityHashSet` to double check.
- Same error.
## What went wrong
The `Component` derive macro implements `visit_entities_mut` by using `VisitEntitiesMut`. `EntityHashSet` and friends can't implement `VisitEntitiesMut` since mutable access to it's keys could break internal invariants.
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