cubicweb-trackervcs #5034747 reviewer selection bug [open]

say we have a ticket T. a patch P from user Alice is linked to the ticket, and Bob is selected as reviewer.

now if Bob submits another patch for the same ticket, and asks for review, no reviewer is selected because we pick from P's reviewer set and exclude the new patch's author, leaving no candidate.

done in<not specified>
load left0.500
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