[ardour-dev] multiple y drag/copy patch

[Paul Davis]

>this revised patch should suck less.
>it handles different sized tracks better, and is probably easier to
>modify.

tasty. i think it still suffers from one issue that we have known
about for some time. when dragging a region, we raise the track's
group to the top of the canvas stack so that the dragged region will
always be visible. its not clear how this should work for multiple
track drags ...