jenkinsci/jenkins — pull request #414 by kayabendroth (2012-03-23 10:19:09+00:00)
Title: Fix for JENKINS-13200: 1.455: Block build when downstream project is building doesn't work

Fix blocking of builds unless job and any of its decendants are done (and if this options set in config). [JENKINS-13200]

I think the commit https://github.com/jenkinsci/jenkins/commit/d6a92f37f9111a68a5f13dc938fe60889eb7273 for Jenkins 1.455 broke that behavior.