netliomax25-code opened a new pull request, #2717:
URL: https://github.com/apache/groovy/pull/2717
Repro: write a lone low surrogate (a `\uDC00`-`\uDFFF` char with no
preceding high surrogate) through StreamingMarkupBuilder, e.g. `new
StreamingMarkupBuilder().bind { mkp.yield '\uDC00' }`.
Cause: the low-surrogate branch in `write(int)` assumes a high surrogate was
already buffered, so it reads `surrogatePair.charAt(0)` (the low surrogate
itself) and emits a numeric character reference for an unrelated code point
(`\uDC00` becomes `𐀀`) instead of failing.
Fix: reject a low surrogate that is not preceded by a high surrogate,
matching the existing rejection of a high surrogate not followed by a low one.
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