mbs-8013: Assign next position correctly when adding data tracks to a disc with a pregap
Add test for d937faf
When the cdtoc changes, better handle pregap/data tracks
Only reset track numbers if they were previously consecutively numbered
Merge remote-tracking branch 'bitmap/mbs-8013' into beta

* bitmap/mbs-8013:
  Only reset track numbers if they were previously consecutively numbered
  When the cdtoc changes, better handle pregap/data tracks
  Add test for d937faf
  mbs-8013: Assign next position correctly when adding data tracks to a disc with a pregap