- os << "\\usepackage[" << from_ascii(encoding().latexName());
- if (features.runparams().flavor == Flavor::LuaTeX
+ string const doc_encoding = encoding().latexName();
+ // The 2022 release of ucs.sty uses the default utf8
+ // inputenc encoding with 'utf8x' inputenc if the ucs
+ // package is not loaded before inputenc.
+ // This breaks existing documents that use utf8x
+ // and also makes utf8x redundant.
+ // Thus we load ucs.sty in order to keep functionality
+ // that would otherwise be silently dropped.
+ if (doc_encoding == "utf8x"
+ && features.isAvailable("ucs-2022/08/07")
+ && !features.isProvided("ucs"))
+ os << "\\usepackage{ucs}\n";
+ os << "\\usepackage[" << from_ascii(doc_encoding);
+ if (features.runparams().flavor == Flavor::LuaTeX