Jump at Volta End makes last measure not skipped
Using the test file from https://musescore.org/en/node/313743
Expected Result: After the D.C. playback should use the "final playthrough" and skip the first volta
Actual Result: The D.C. breaks the volta interpretation, leaving m6 to be included in "final playthrough".
Underlying reason: Jumps break up voltas, which makes sense in the case where the Jump is trailing an open ended volta (the intended code path here). But it doesn't make sense when the Jump is enclosed within the volta's notated anchor point (be it open or closed).
Solution: Just as with overlapping voltas, it is required to duplicate and split the volta here. (istr there's already a TODO hook in the code for this)