Comment 4 for bug 1612541

Even if user carefully place all track around keep-out zone it's still a problem. Cause track locking doesn't work with interactive router as well.
And this one is the most annoying part. If you accidentally touch already placed track while routing something else, router often decide "to optimize" old track straightening it out through keep-out zone. This can happen when you're focused on other part of there board and then... bam... Surprise!!!