fix(UserPlugin): Don't return mail matches on user id search#61981
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Assisted-by: ClaudeCode:claude-fable-5 Signed-off-by: David Dreschner <david.dreschner@nextcloud.com>
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Summary
Since #47686 , the backend search not only returns matches by user ID, but also by their mail address. This is very confusing, as you would expect that to be impossible when the
shareapi_restrict_user_enumeration_full_match_emailsetting is being set tono.This PR fixes that by checking if the matched user in the user ID code branch was actually a match by user ID and not by something else (like the mail address) as well as adding integration tests to prevent that from happening in the future.
Checklist
3. to review, feature component)stable32)AI (if applicable)