9b070eefb106c25032d6e077090d9f8a959aefc4
We need a MidiStateTracker to determine notes whose end is not reached during the call to ::write_one_track(), so that we can resolve them in the output (SMF) source. This required some changes to the ::export_stuff() API for tracks. In addition, we now take the source "lock" just once during ::write_one_track() rather than every time we write. This isn't an integral part of the note tracking, but fell out along the way. Finally, note that although we use a vector to handle MIDI "sources" here, it is expected that there is only 1 MIDI source at present. Leave vectors in place since it is possible that ::write_one_track() could be modified in the future to change that.
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