I have a situation where diff pairs are routing within the area of a BGA device in neck mode. When
the traces emerge from that area, they open up to their regular defined spacing, and then proceed
to their destination somewhere else. When I use the slide command and grab one element of the
diff pair, what happens is that the other cline immediately snaps to the neck spacing gap for the
entire length of the route. Can anyone shed any light on why this is happening?