Staff lines failed to be recognized

[jlpoolen]

This duet version contains dense staves which have slurs and beams overlapping staff lines. The result is that the thick nature of the overlaps cause the short verticals tables to be deprived of accurate staff line runs.

Here is a sample page where the 4th system fails to be identified. From the piano duet of Mendelssohn's 4th Symphony "The Italian", 1st movement.

[jlpoolen]

[jlpoolen]

An analysis of long horizontal runs shows that the staff that is failed to be recognized has healthy long runs in it.

7   1   186 2042    2417    1754
        1   2043    2677    1794
    2   25  2068    2333    1780
        1   2069    2952    1524
    3   26  2095    2464    2055
        1   2096    2025    2448
    4   24  2120    682 1379
        1   2121    2478    1515
        1   2122    2448    2036
        1   2123    3115    1342
    5   23  2146    705 1345
        1   2147    2615    1649
        1   2148    3145    1281

[jlpoolen]

Above is what the short verticals window shows for the corresponding stave that was missed.