When a project is disabled, still it can execute a build.
In the eXtreme Feedback panel it is shown as not building.
public BallColor getIconColor()
This can be changed to:
BallColor normalColor = super.getIconColor();
We use disable project to let a project finish his job and then take action on that job and prevent a next build is started.
The eXtreme feedback panel does not help us right now to see if the job is finished.