Code review comment for lp:~vthompson/music-app/fix-1332570-test_next_previous

Hopefully should resolve the issue :)

And passes on mako locally for me:
00:17:28.789 INFO testresult:46 - OK: music_app.tests.test_music.TestMainWindow.test_next_previous(with touch)

Ran 1 test in 78.110s
OK