You and your coworker have similar responsibilities and often work together on projects. Coworker is not really friendly and some case history has established that leads you to believe that they do no like you very much. You author a paper by coworker's request, they edit it without telling you and e-mail it out to a "Core Team" that you have not been invited to and you did not even get copied on the e-mail. The coworker did not credit you with the work.
How mad would you be?
Would you confront the coworker? What would you say?
If you would not confront the coworker, what would you do?