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### Room Upgrades
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From time to time, a room may need to be upgraded to a different room
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version for a variety of reasons. This module defines a way for rooms
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to upgrade to a different room version when needed.
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#### Events
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{{% event event="m.room.tombstone" %}}
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#### Client behaviour
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Clients which understand `m.room.tombstone` events and the `predecessor`
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field on `m.room.create` events should communicate to the user that the
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room was upgraded. One way of accomplishing this would be hiding the old
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room from the user's room list and showing banners linking between the
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old and new room - ensuring that permalinks work when referencing the
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old room. Another approach may be to virtually merge the rooms such that
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the old room's timeline seamlessly continues into the new timeline
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without the user having to jump between the rooms.
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{{% http-api spec="client-server" api="room_upgrades" %}}
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#### Server behaviour
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When the client requests to upgrade a known room to a known version, the
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server:
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1. Checks that the user has permission to send `m.room.tombstone`
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events in the room.
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2. {{< changed-in v="1.4" >}} Creates a replacement room with a `m.room.create` event containing a
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`predecessor` field, the applicable `room_version`, and a `type` field
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which is copied from the `predecessor` room. If no `type` is set on the
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previous room, no `type` is specified on the new room's create event
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either.
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3. Replicates transferable state events to the new room. The exact
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details for what is transferred is left as an implementation detail,
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however the recommended state events to transfer are:
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- `m.room.server_acl`
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- `m.room.encryption`
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- `m.room.name`
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- `m.room.avatar`
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- `m.room.topic`
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- `m.room.guest_access`
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- `m.room.history_visibility`
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- `m.room.join_rules`
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- `m.room.power_levels`
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Membership events should not be transferred to the new room due to
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technical limitations of servers not being able to impersonate
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people from other homeservers. Additionally, servers should not
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transfer state events which are sensitive to who sent them, such as
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events outside of the Matrix namespace where clients may rely on the
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sender to match certain criteria.
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4. Moves any local aliases to the new room.
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5. Sends a `m.room.tombstone` event to the old room to indicate that it
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is not intended to be used any further.
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6. If possible, the power levels in the old room should also be
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modified to prevent sending of events and inviting new users. For
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example, setting `events_default` and `invite` to the greater of
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`50` and `users_default + 1`.
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When a user joins the new room, the server should automatically
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transfer/replicate some of the user's personalized settings such as
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notifications, tags, etc.
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