Volta deleted when deleting range that includes start & end point

Ubuntu 14.04, GIT commit: 4eda1f6

1) new score
2) add a (single measure) volta to measure 2
3) select measure 2-3
4) delete

Result: volta is deleted

There was a lot of back forth on when spanners should be deleted over the summer, and I know code was added to delete spanners if both endpoints were removed, but I'm pretty sure it was never intended that this apply to voltas.