Fix undefined behavior in C++20, see #4735
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@ -832,7 +832,8 @@ namespace StringUtils
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if (utf32[i] >= 128 || utf32[i] == '&' || utf32[i] == '<' ||
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utf32[i] == '>' || utf32[i] == '\"' || utf32[i] == ' ')
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{
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output << "&#x" << std::hex << std::uppercase << utf32[i] << ";";
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unsigned code = (unsigned)utf32[i];
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output << "&#x" << std::hex << std::uppercase << code << ";";
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}
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else
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{
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