Please display user handles in the "Add people to repo" dialog

[benlk]

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Bug

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Definitions:

• Handle: a user's GitHub account username, like benlk
• Display name: the name a user has set for themself, like Ben Keith, which can be changed at any time
• Avatar: the image that a user sets to represent their account, such as https://avatars.githubusercontent.com/u/1754187?v=4

In a repo's access management settings (https://github.com/github/github/settings/access), the dialog for adding users to the repository does not currently differentiate between users who have the same display name and the same avatar. Here, I've searched for "helen":

Note that the only things differentiating users from each other are signifiers that are under the user's control: their display name and avatar image.

The user's handle is displayed on the screen following a click in the modal, but at that point, a user who is adding someone to the repo is already operating on the assumption that this is the correct user.

Failure to differentiate accounts by signifiers that are not user-controlled opens repository owners to attacks by account-cloning: creating an account that has the same avatar and display name as a known account, and waiting for the repository owner to erroneously add the clone instead of the real user.

Please add the user's handle to the "Add people" dialog. To prevent against homoglyph attacks, make sure that the handle is displayed using a monospace font which adequately distinguishes between common homoglyphs that can be used in a Github handle, like 0O and Il1

[github-actions[bot]]

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