Recent users logic

[alfogrillo]

As a user that wants to create a new chat I want to see some proposals for users to invite so I don't have to remember the matrix id of the person I want to have a conversation with.

Designs
https://www.figma.com/file/0MMNu7cTOzLOlWb7ctTkv3/Element-X-(new)?node-id=189%3A25255&t=7PXA7SLLH426S2GK-1

ACs

• The user can see other users (aka direct rooms) he had a recent conversation with
• Clients will show at most 5 results, but it should be a changeable parameter.
• Results are sorted by last activity / last message (more details below)
• Results should be built by just using local information

Web implementation

1. Take all the direct rooms of the user (ignore group DM rooms)
2. For each room in the above consider the last 20 events in the local database
3. In the above 20 events consider just the ones with types m.room.message, m.room.encrypted, m.sticker. Consider just the timestamp of the most recent event (if any) with the above filters.
4. Return the users (the other party in the chat) sorted by the timestamp found at the previous step
   • If timestamp are the same for two users, sort by alphabetical order of user ids.

Web reference

Tasks

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1. Add logic to get "recent users" matrix-org/matrix-rust-sdk#1562
   Z-ElementX-Alpha enhancement +2