f371ac1beb
To export a MIDI region to a file, the code used MidiRegion::clone() since it takes care of creating a new file-backed source with the wanted contents. Nevertheless, it had several side-effects: - it created and registered a new region which is confusing to users - it only exported notes that were in the region range, but didn't remove the region start offset from MIDI events, essentially producing a spurious silence at the beginning of the exported file (this is not a problem for region cloning because the newly created region is made aware of the offset and caters for it). Add a dedicated code path for export, that uses the new offsetting capabilities of MidiModel::write_section_to().
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