sublime-syntax (oniguruma regex): nested char classes aren't always scoped properly

[keith-hall]

For example, this regex: (?:[[-\w]{{nonascii}}]|{{escape}})

It seems it detects the [-\w] as a range rather than a nested character class, and the ] is scoped as a literal. It gets it right if you remove the - or move it to after the \w.