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webern
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<key print-object="no"> (a key signature that applies to the music but is not drawn) had no api home, so it was written back as a plain <key> and the signature became visible. KeyData gains printObject, a Bool that mirrors ClefData::printObject. The reader fills it for traditional and non-traditional keys, and the writer emits it when it is not unspecified. The default leaves output unchanged. musuite/testInvisibleElements.xml now round-trips and is pinned in the baseline.
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Summary
<key print-object="no">(a key signature that applies to the music but is not drawn) had no apihome, so it was written back as a plain
<key>and the signature became visible.KeyDatagainsprintObject, a tri-stateBoolthat mirrorsClefData::printObject. The readerfills it for traditional and non-traditional keys;
PropertiesWriter::writeKey, the one place a<key>is built, emits it when it is not unspecified. The default leaves output unchanged.data/api.features.xmlmarks keyprint-objectas supported.musuite/testInvisibleElements.xmlnow round-trips and is pinned in the baseline.Not addressed here: the non-traditional key reader branch still does not set
staffIndexortickTimePosition, and other<key>attributes (color, position, font) are still dropped.Testing
PrintObject*cases inKeyDataTest.cpp: no, yes, unspecified (omitted), non-traditional,per-staff, and equality
make api-testpasses (6141 assertions in 710 test cases)make api-roundtrippasses, 442 of 442 pinned filesmake api-roundtrip-discover: 442 pass, no file that passed before now failsmake fmt-checkpassesReferences