(bug 35217) [CodeReview] As per the bug, I have added a new config setting, $wgCodeReviewDisableFollowUpNotification, which is probably pretty self-explanatory. Set this flag to true if you want to disable the automatic notifications to all watchers of a specific revision, when a follow-up to that revision is committed. Useful for small repos when everyone is reading the commit e-mails anyway, or if you have multiple repositories which refer to one another, which result in an unreasonable level of false positives. Note that the new revision will still be marked as a follow-up - this setting just stops the e-mail being sent.
The default value of false means that behaviour will remain unchanged for existing installations.