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def.lang: Update Unicode identifier regexes

Jeffery To requested to merge jefferyto/gtksourceview:fix-unicode-identifier-chars into master

  • Update def:unicode-id-start and def:unicode-id-continue

    The definitions of ID_Start and ID_Continue include subtracting characters from Pattern_Syntax and Pattern_White_Space; there is one character (U+2E2F VERTICAL TILDE) that needs to be subtracted.

  • Add def:unicode-xid-start and def:unicode-xid-continue

    These classes are ID_Start and ID_Continue modified for closure under NFKC normalization; certain ineligible characters are subtracted.

Also:

  • Update python3.lang to use def:unicode-xid-start and def:unicode-xid-continue

  • Update javascript.lang (and family) with the updated definition of def:unicode-id-continue

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