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NEWS.rst

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-- [varLib.interpolatable] Various bugfixes and rendering improvements. In particular, a new test for "underweight" glyphs. The new test reports quite a few falsse-positives though. Please send feedback.
+- [featureVars] Allow to register the same set of substitution rules to multiple features.
+  The ``addFeatureVariations`` function can now take a list of featureTags; similarly, the
+  lib key 'com.github.fonttools.varLib.featureVarsFeatureTag' can now take a
+  comma-separateed string of feature tags (e.g. "salt,ss01") instead of a single tag (#3360).
+- [featureVars] Don't overwrite GSUB FeatureVariations, but append new records to it
+  for features which are not already there. But raise ``VarLibError`` if the feature tag
+  already has feature variations associated with it (#3363).
+- [varLib] Added ``addGSUBFeatureVariations`` function to add GSUB Feature Variations
+  to an existing variable font from rules defined in a DesignSpace document (#3362).
+- [varLib.interpolatable] Various bugfixes and rendering improvements. In particular,
+  a new test for "underweight" glyphs. The new test reports quite a few false-positives
+  though. Please send feedback.
 
 4.45.1 (released 2023-11-23)
 ----------------------------