Fix rounding errors caused by glyph cross references (#2545) #2546
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This change fixes #2545, which is caused by rounding error, which is then caused by glyph level dependencies when flattening the geometry.
ReferenceGeometryholds a glyph reference, so when simplifying the geometry, we cannot modify the geometry data glyph by glyph (a later processed glyph may depend on some other glyph before it, causing this bug).