Let user know about non accessible replies because of denied history access

[giomfo]

Steps to reproduce

Scenario:

• A room exists since time t0
• User A joined the room at time t1>t0
• User B gets an invite to at time t2>t1 and also joins the room
• The room history settings does not allow that User B can see messages before t2
• User A can now reply to messages between t1 and t2 which should be not visible to user B

Outcome

What did you expect?

The original text should be hidden in UserB side

The client must check if the user has the permission to have access to the original event. For that, the client should check the response to the following request GET https://\<homeserver>/_matrix/client/r0/rooms/\<roomId>/context/\<eventId> If the answer is "403 Forbidden" -> the fallback has to be ignored The _replyto event rendering should be similar to Element-web rendering:

Suggested wording: "Unable to load event that was replied to, it either does not exist or you do not have permission to view it."

What happened instead?

User B sees the original message in the reply part of the message from User A

Here: "msg3" should not be visible by Marcel

Your phone model

No response

Operating system version

No response

Application version

No response

Homeserver

No response

Will you send logs?

No

[giomfo]

After investigation, we realized that it would be complex to fix this issue without rewriting all the reply_to logic. We know the issue will not appear in ElementX because the reply_to have been implemented without considering the fallback (like the Element web client is doing currently) We decided to close it as no planned for Element-iOS