alhudz opened a new pull request, #1691:
URL: https://github.com/apache/commons-lang/pull/1691
Repro: build a `LookupTranslator` whose key is a single supplementary code
point, e.g. `U+1D54F` mapped to `X`, then `translate("𝕏Y")`.
Expected: `XY`. Actual: `X` — the trailing `Y` is silently dropped (likewise
`a𝕏b` becomes `aX`).
Cause: `translate` returns the matched key length counted in `char`s (`i`),
but `CharSequenceTranslator` documents the return value as a count of code
points and advances the cursor by `Character.charCount` per unit. A
supplementary key is two `char`s but one code point, so the loop steps twice
and over-consumes the following character.
Fix: return `Character.codePointCount(input, index, index + i)` so the count
matches the framework's code-point stepping. The other translators in the
package already return code-point counts, so this is the only affected site.
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