[Story] Warn if all other users are blocked in the DM/room

[kittykat]

A story should take roughly a week or a sprint to finish. Each story is usually made up of a number of tasks that take half to a full day.

As a user,
I want to know when I have blocked everyone in a room
so that I know that no one will receive my messages when I send messages into that room

This if follow on from #1106

Scope

Tasklist

Preview Give feedback

1. In a DM, if I have blocked the other user, I get a warning when I try to send a message when I try to send a message to the room
2. In a group chat, if I have blocked all other users in the room, I get a warning when I try to send a message to the room

Android

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

iOS

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

Stretch goals

None at this time

Out of scope

[manuroe]

@VolkerJunginger should we work on this now?

It has been discovered during QA on #1106. Look for "You won’t be able to receive or send any messages until you unblock them" in this issue.
This is the last action of the https://github.com/vector-im/internal-planning/issues/334 epic.

[VolkerJunginger]

No, let's put this into the backlog. This is neither urgent nor has big impact.

[manuroe]

I added it to the backog