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37aedd4251 Restore GP6/7/8 tremolo picking on import (#572)
* Map GP7/8 tremolo picking on import

GP7/8 (GPIF) encodes tremolo picking as a beat-level <Tremolo> element,
which the importer ignored — so tremolo was silently dropped on .gp import,
while note vibrato and the GP3-5 path were unaffected. Read the beat-level
<Tremolo> and set the note tremolo flag across the beat, independent of
vibrato (a note can carry both).

Signed-off-by: Sin <deathlysin@outlook.com>

* test: cover GP6/7/8 tremolo-picking import

Extract the beat-level <Tremolo> detection into a pure _beat_has_tremolo
helper (mirroring the tested _note_has_vibrato) so it's unit-testable in
this suite's fixture-free style, then add:

- 4 unit tests on _beat_has_tremolo: direct <Tremolo> child detected
  (rate-agnostic), absent -> False, direct-child-only (nested Tremolo
  ignored), independent of the VibratoWTremBar whammy property.
- 1 end-to-end test driving convert_file via a crafted GPIF (monkeypatched
  _load_gpif): a tremolo-picked beat's note serializes tremolo="1" while a
  plain beat stays "0".

Both the detection and integration tests fail without the fix; full GP
suite 238 passed. Refactor is behavior-identical.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Signed-off-by: Sin <deathlysin@outlook.com>
Co-authored-by: Byron Gamatos <xasiklas@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-22 21:14:43 +02:00
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