alhudz opened a new pull request, #1719:
URL: https://github.com/apache/commons-lang/pull/1719
Repro: `StringUtils.abbreviate("😀abcdef", 4)` returns a lone high surrogate
followed by `...`, and `StringUtils.truncate("a😀b", 0, 2)` returns `a` plus a
lone high surrogate.
Cause: both choose the cut position in `char` units and slice with
`String.substring`, so a boundary that lands between the two halves of a
surrogate pair leaves an unpaired surrogate behind.
Fix: nudge the boundary to the nearest code-point edge before slicing, so a
pair is never split. The result still never exceeds `maxWidth`.
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