v2.25.0

• Drop Python 3.6 support, require Python >= 3.7 (#541)
• [COLR] Don't copy color layer refers to a glyph in the same UFO layer,
  don’t make an pessary copy of the glyph (#538)
• [preProcessoer] Apply ExplodeColorLayerGlyphsFilter to interpolatable
  TTFs (#537)
• [featureWriters] Add writer for curs feature (#476)
• [doc] Document color layers lib keys (#536)

v2.24.0

• [filters] Also transform advance width and height when applying a scale through
  the Transformations filter (#490, #515).
• [COLR] Define new 'colrClipBoxes' lib key, to be used with colorLib.buildCOLR
  for building COLRv1 ClipList table (#521).

v2.23.0

• [featureWriters] Added quantization option to MarkFeatureWriter and KernFeatureWriter, to round values to the nearest multiple of a given integer value, thus potentially optimizing the GPOS size (#513, #516, #517).
• [MarkFeatureWriter] Ensure mark is always written before mkmk feature (#506, #512).
• Bump minimum required fonttools >= 4.25.1. Fixes a bug with the TTGlyphPen when compiling glyphs with open contours (googlefonts/nanoemoji#304).

v2.22.0

• Added support for Unicode Variation Sequences via lib key public.unicodeVariationSequences (#495, #496, #162).
• outlineCompiler now uses the new fonttools' TTGlyphPointPen to avoid modification of the order of TrueType contour points (#503).
• Added support for meta table from "public.openTypeMeta" UFO lib key (#509).
• Fixed issue whereby MarkFeatureWriter's markClasses were inserted after manual mkmk feature, leading to compilation error (#504, #505).

v2.21.0

• While compiling variable fonts, only post-process the final merged font. This can save ca. 14-24% of the compilation time, depending on the sources. (#486)

v2.20.0

• Use cffsubr by default for both CFF 1.0 and CFF2 (#465). Make compreffor an optional requirement (#464).
• Added support for # Automatic Code special marker comments to allow inserting auto-generated features in specific places of the features.fea, similar to Glyphs.app (#458, #482, #351).
• Allow to run ufo2ft filters and featureWriters from the command line, which can be helpful for testing purposes (#470, #473).
• Added loadFilterFromString function, pass filters argument to compile functions and PreProcessor (#466, #479, googlefonts/fontmake#737).
• Added GDEF feature writer (enabled by default) that generates GlyphClassDefs based on UFO public.openTypeCategories, and also generates ligature caret statements based on "caret_" or "vcaret_" named glyph anchors (#480).

v2.19.2

• [flattenCompontents] Fixed issue with mixed contour+component glyphs in nested components (#448).
• [flattenCompontents] Fixed issue with transformed nested components ending up with the wrong translation offset (#450).

v2.19.1

Only cosmetic changes since v2.19.0

• Removed last vestiges of py2 support
• Reformatted code with black and isort

v2.19.0

Added flattenComponents compile option. If set, composite glyphs with nested components are flattened so that they have at most one level of components (#438).

v2.18.1

[featureWriters] Fixed KeyError when glyphOrder contains more glyphs than the glyphSet subsetted with 'public.skipExportGlyphs' UFO lib key (#432, #434).