Fix grapheme cluster width - #126
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as pointed out in #125, the width of a grapheme cluster is not the sum of the wcwidth of its codepoints. there's no standard way of determining the column width of a grapheme cluster, but the implementation in this commit is a decent real world approximation. basically, it returns the max wcwidth in the cluster, and tries to account for vs15, vs16, zero-width joiners, and regional indicators.
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As pointed out in #125, the width of a grapheme cluster is not the sum of the wcwidth of its codepoints. There's no standard way of determining the column width of a grapheme cluster, but the implementation in this commit is a decent real world approximation. Basically, it returns the max wcwidth in the cluster, and tries to account for VS15, VS16, zero-width joiners, and regional indicators, which are common exceptions to this shortcut.