[Story] Username disambiguation

[Velin92]

Description

• As a user I want my username and the username of other users to not be spoofed by other malicious users by having the user ID being shown if multiple users in the same room share the same display name, so that I can always understand who really is the user having that display name, and if they are pretending to be someone else.

Acceptance criteria

• If multiple users have the same display name in a room we should display also their user id in the timeline and in notifications
• The additional user ID displayed in the timeline should probably be displayed with a slightly different format than the display name, this is already done on web, this is for security reason to avoid users spoofing also the presence of the user ID in their name to circumvent the ambiguity check.

Leads

• Tech: @Velin92
• Design: @amshakal

Size estimate

S

Dependencies

• None

Out of scope

• Nothing

Open questions

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Subtasks

Android

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1. Display name disambiguation element-x-android#2221
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2. Disambiguate display name in notifications #2224 element-x-android#2295
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iOS

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Rust

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Sign-off

Android

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iOS

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