alhudz opened a new pull request, #1731:
URL: https://github.com/apache/commons-lang/pull/1731
Repro: `WordUtils.wrap("a😀😀😀😀", 4, "\n", true)`, four `U+1F600` after a
leading `a`.
Cause: with `wrapLongWords` set, a word longer than the column is
hard-broken at the fixed char offset `wrapLength + offset` and the new-line is
inserted there. When that offset lands between the high and low surrogate of a
supplementary code point the pair is split, so a lossless wrap emits a lone
high surrogate at the end of one line and a lone low surrogate at the start of
the next.
Fix: nudge the break one char forward when it would land inside a pair,
keeping the whole code point on the current line. BMP input and the
delimiter-based wrap paths are unaffected.
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