`EntityWorldMut::(try_)resource_scope`

[BigWingBeat]

What problem does this solve or what need does it fill?

EntityWorldMut mirrors many of the methods on World, but not all of them. One of the methods it does not mirror is resource_scope. If you need to use resource_scope in a context where you have an EntityWorldMut, such as an EntityCommand, you currently need to deconstruct and then reconstruct it like so:

let id = entity_world_mut.id();
let world = entity_world_mut.into_world_mut();
world.resource_scope::<_, _>(|world, res| {
    let entity_world_mut = world.entity_mut(id);
    /* ... */
});

What solution would you like?

Add resource_scope and try_resource_scope methods to EntityWorldMut that mirror the corresponding methods on World.

What alternative(s) have you considered?

• Change methods like EntityCommand::apply, BundleEffect::apply, and anything else that takes an EntityWorldMut as a parameter, to instead separately take an Entity and a &mut World as parameters.
• Continue using the aforementioned workaround.