Fix cursor position following multibyte characters #428
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Closes #427 Use `charcol` over `col` where it exists. Gate the function definition behind the feature check to avoid repeating it for every call.
Use a single utility that wraps charcol when possible, and falls back on col otherwise. Older vim without charcol will not handle multibyte characters for now. Continue to use `col` for the tag stack, and `virtcol` for setting character position. In places where the column is used to index into a string value, prefer `charcol` when available.
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Closes #427
Use
charcolovercolwhere it exists.Gate the function definition behind the feature check to avoid repeating
it for every call.