m.room.aliases is deprecated since MSC2432

[johannes-krude]

It seems the spec has evolved since Room#aliases was implemented.

m.room.aliases is deprecated and I have a room which an uptodate m.room.canonical_alias as well as an old m.room.aliases state event which contains outdated aliases.

Upon initical sync, matrix-ruby-sdk uses the m.room.canonical_aliases state, but after one hour the cache is discarded and ruby-matrix-sdk then instead uses m.room.aliases in Room#aliases and Protocols::CS#get_room_aliases.

There are now two different sources to get aliases from:

• m.room.canonical_aliases has a curated subset of all aliases for a room
• /_matrix/client/v3/rooms/{roomId}/aliases returns a list of all server-local aliases

In my opinion, any handling of m.room.aliases should be removed from ruby-matrix-sdk.