511b09b3d6
Because MIDI triggers compute buffer-relative timestamps using timeline_samples - start_sample, this already takes into account any offset to the start of the trigger. We still need to use dest_offset if a non-zero value was passed into ::midi_run(), but we do NOT want to have it contain the "offset to start of trigger in process cycle" as well. Instead of trying to special case ::maybe_compute_next_transition(), we just pass a dummy pframes_t to that method, leaving dest_offset as it was passed into ::midi_run()
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