This is the warning that Phil noticed in the regression-test comparison.
In a situation where you typeset several files in one run with
lilypond *.ly
such as four movements of a piece, the internal MIDI-channel counter might
exceed 16 and give a "warning: MIDI channel wrapped around".
If each file uses 16-channels or fewer, then each MIDI file will play
just fine.
% Instead of putting many input files on the command line,
% we can just request several MIDI files in a short test file
\score {<<
\new Staff c
\new Staff c
\new Staff c
\new Staff c >>
\midi {} \midi {} \midi {} \midi {}
}
The simple input above demonstrates the false warning when
midiChannelMapping=#'staff, the default since version 2.13.63.
When midiChannelMapping=#'instrument, the problem does not appear until
the total number of unique instruments in all the files exceeds 16 (counting
all drumstaffs together as one).
It seems that Staff_performer::static_channel_map_ and channel_count_ should
be reset between MIDI output files. Formerly, the channel counter was reset
in the hconstructor for "Performance".
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