RegistryState/GlobalList redundancy

[MaxVerevkin]

From what I understand, right now global handling is done in multiple steps:

1. waylad_client: GlobalList intercepts events and fills it's internal Mutex<Vec<Global>>. After the initial roundtrip it starts propagating new events.
2. client-toolkit: RegistryState clones the list of globals from GlobalList and keeps it in sync.

It seems that having two copies of Vec<Global> is redundant.

[ids1024]

I'm not sure there's a way to avoid some kind of redundancy here as long as wayland_client has a helper related to globals, and sctk needs a helper that provides additional functionality (for hotpluggable globals).

But it would be good to improve this if anyone has ideas.

[i509VCB]

I don't see a way we can remove this redundancy without expanding wayland-client's helpers into this scope or tell users of sctk to manually instantiate globals like wl_output

[ids1024]

I guess this abstraction is useful in wayland-rs for things that are using wayland-rs without sctk?

Assuming it's thus necessary to have in client-toolkit, there might be a couple options:

• Just don't use this wayland-client feature in sctk, and duplicate it (or wrap the wayland-client version, so the user of sctk doesn't directly call it)
• Expand the scope of this in wayland-client in some way, and remove the need for a registry helper type in sctk
  • This seems to blur the boundry of what's in scope for wayland-client and for sctk