Fix duplicate nickname check with custom display names #3922
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Information
This fixes a quirk in which if the display name is changed by another plugin (eg: prefixes from PEX), it is possible for two online users to change their nicknames to be the same. As far as I can tell, no such previous issue exists.
Details
Proposed fix:
Check for nickname similarity switched to split on nickname prefix, rather than replace it. This avoids capturing anything in the display name before the nickname prefix, which correctly shows a warning if a duplicate exists.
Environments tested: