Move time conversion into the region view rather than the source.
Adapt MIDI (including controllers) regions to the destination tempo when moved (e.g. dragging a region to a location with half the tempo will make the notes twice as long).
git-svn-id: svn://localhost/ardour2/branches/3.0@4635 d708f5d6-7413-0410-9779-e7cbd77b26cf