When a user's request for rename through Special:GlobalRenameRequest is completed, all users with the name are being emailed of its completion. This is a problem because all the contacted users think they are being renamed when they are not.
$oldUser->sendMail( $subject, $body );
seems to be the trouble.
The problem appears to be that we rename the proper user but when we send the email we use the email address of the user that was locally attached on the wiki where the rename was processed.
Change 198441 had a related patch set uploaded (by BryanDavis):
Ensure that emails are sent to correct email address
Change 198441 merged by jenkins-bot:
Ensure that emails are sent to correct email address
Change 199044 had a related patch set uploaded (by Legoktm):
Ensure that emails are sent to correct email address
Change 199046 had a related patch set uploaded (by Legoktm):
Ensure that emails are sent to correct email address
Change 199044 merged by Legoktm:
Ensure that emails are sent to correct email address
Change 199046 merged by Legoktm:
Ensure that emails are sent to correct email address