ensure fitness

CHANGELOG.md

@@ -246,6 +246,7 @@
     Task #5896: Do not use deprecated MyGUI properties
     Task #6085: Replace boost::filesystem with std::filesystem
     Task #6149: Dehardcode Lua API_REVISION
+    Task #6505: UTF-8 support in Lua scripts
     Task #6624: Drop support for saves made prior to 0.45
     Task #7048: Get rid of std::bind
     Task #7113: Move from std::atoi to std::from_char

components/lua/utf8.cpp

@@ -96,7 +96,7 @@ namespace LuaUtf8
 
         utf8["char"] = [](const sol::variadic_args args) -> std::string {
             std::string result{};
-            std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
+            std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> converter;
             for (size_t i = 0; i < args.size(); ++i)
             {
                 int64_t codepoint = getInteger(args[i], (i + 1), "char");
@@ -104,8 +104,7 @@ namespace LuaUtf8
                     throw std::runtime_error(
                         "bad argument #" + std::to_string(i + 1) + " to 'char' (value out of range)");
 
-                // this feels dodgy if wchar_t is 16-bit as MAXUTF won't fit in sixteen bits
-                result += converter.to_bytes(static_cast<wchar_t>(codepoint));
+                result += converter.to_bytes(static_cast<char32_t>(codepoint));
             }
             return result;
         };