[Story] ER-212: Show room encryption state in the composer

[mxandreas]

Description

The main goal of this is to mitigate the potential attacks on "downgrading" room encryption via cloning/spoofing of rooms as captured on https://github.com/matrix-org/internal-config/issues/1606.

It should be clear for the user if the room is E2EE when sending the message. Currently there is some indication on EW (a legacy shield and placeholder text of the composer) but nothing on EX, making it slightly less urgent for EW.

Designs are available here for all platforms (this story only concerns the decoration in the composer, potential decoration in other areas should be ignored). Illustration on iOS:

Acceptance criteria

• Composer shows room encryption state in/at the composer

Leads

• Tech:
• Design:

Size estimate

None

Dependencies

• None

Out of scope

• Nothing

Open questions

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Subtasks

Android

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iOS

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Web

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Sign-off

Android

• Design sign-off on completion
• QA sign-off on completion
• Product sign-off on completion

iOS

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• QA sign-off on completion
• Product sign-off on completion