Github user markobean commented on the issue:
https://github.com/apache/nifi/pull/2957
@scottyaslan The connections do not need to be overlapping to experience
the bad behavior. As the JIRA ticket says, "Select a connection. Then, select
another connection on its bend point." These connections do not need to be
overlapping. In both cases, the second connection can be manipulated while the
first connection still displays as highlighted. That is the behavior prior to
this fix, that is.---
