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aec4938a21
Problem:
`vim.rpcnotify(0)` and `rpcnotify(0)` are documented as follows:
If {channel} is 0, the event is broadcast to all channels.
But that's not actually true. Channels must call `nvim_subscribe` to
receive "broadcast" events, so it's actually "multicast".
- Assuming there is a use-case for "broadcast", the current model adds
an extra step for broadcasting: all channels need to "subscribe".
- The presence of `nvim_subscribe` is a source of confusion for users,
because its name implies something more generally useful than what it
does.
Presumably the use-case of `nvim_subscribe` is to avoid "noise" on RPC
channels not expected a broadcast notification, and potentially an error
if the channel client reports an unknown event.
Solution:
- Deprecate `nvim_subscribe`/`nvim_unsubscribe`.
- If applications want to multicast, they can keep their own multicast
list. Or they can use `nvim_list_chans()` and `nvim_get_chan_info()`
to enumerate and filter the clients they want to target.
- Always send "broadcast" events to ALL channels. Don't require channels
to "subscribe" to receive broadcasts. This matches the documented
behavior of `rpcnotify()`.