[Story] Show read receipts

[VolkerJunginger]

As a user that has send a message I want to get an info if the message has been read to know my information has reached the receiver.

Userflow
Receiver

• When the receiver opens a room with unread messages mark all unread messages in the main timeline as "read".
• Mark all unread messages in Threads as read when the user has opened the Thread.
• If a receiver marks a room as "unread" don't mark messages as unread if they have been marked as read before.

Sender

• When the sender is looking at the messages he has send and they are marked as "read" on the receiver side - mark them as "read" on sender side, too.

Spec
https://spec.matrix.org/v1.6/client-server-api/#receipts

Scope

These should be a list of technical tasks which take ½-1 day to complete

iOS

Preview Give feedback

1. Timeline - Read receipts vector-im/element-x-ios#110
   T-User Story Z-BBQ-Alpha Z-BBQ-Beta +3
2. Read receipts with avatars element-x-ios#1052
   +0
   
3. Tapping on read receipts should display a sheet vector-im/element-x-ios#1053
   A-Read-Receipt T-Task Z-Labs Z-Polish Z-Schedule +5
   
4. Read receipts lack profile data vector-im/element-x-ios#1381
   A-Read-Receipt O-Frequent S-Major T-Task X-Needs-Rust Z-Labs +6
5. Same user shows twice in RR vector-im/element-x-ios#2000
   A-Read-Receipt O-Uncommon S-Major T-Defect X-Needs-Rust Z-Schedule +6

• QA signoff on completion
• Design signoff on completion
• Product signoff on completion

Android

Preview Give feedback

1. Render read receipt vector-im/element-x-android#1808
   A-Read-Receipt A-Timeline T-Enhancement Z-Labs +4
   

• QA signoff on completion
• Design signoff on completion
• Product signoff on completion

Stretch goals

None at this time

Out of scope

• Known issue: Invisible Read Receipt matrix-org/matrix-rust-sdk#2889

[erkinalp]

When the receiver opens a room with unread messages mark all unread messages in the main timeline as "read".

Alternative: when the receiver moves the room timeline view to a point no earlier than event #Y in room #X for the first time, the room #X's fully read marker moves to event #Y. As the fully read marker cannot be ahead of the public read receipt by spec, the public mark shall move implicitly.