[wp-trac] [WordPress Trac] #58862: Add filter to allow to change who can add new users with their username on multisite

[WordPress Trac]

#58862: Add filter to allow to change who can add new users with their username on
multisite
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 Reporter:  sippis       |       Owner:  (none)
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Users        |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:
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Comment (by sippis):

 Oh, it looks like autocomplete can be allowed via
 `autocomplete_users_for_site_admins` filter. Autocomplete searches against
 the email address AND username, fills in the username, and when the form
 is submitted, validation nags about the invalid email address.

 1. Return true for `autocomplete_users_for_site_admins`
 2. Go to user-new.php
 3. Type a username that is not part of any email
 4. Select the result and submit form

 So this is actually a bug, since one does nothing with the autocomplete
 enabled without allowing usernames to be used.

 Should the `autocomplete_users_for_site_admins` filter also be used for
 the message and validation parts, or should a new filter still be
 introduced?

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Ticket URL: <https://core.trac.wordpress.org/ticket/58862#comment:2>
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