Correctly split three-or-more byte sequences of UTF-8 #2123
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The underlying bug was the assumption that
uft8.DecodeLastRuneInString
returns some kind of number of bytes that, when stripped from the end, leaves the string with a correct ending.In reality, this function always returns the constant value 1 if the last rune is not valid.
Therefore, if there are two or more partial bytes of a three-or-more byte rune, this used to give the wrong result.
Found while trying to implement a related feature.