gistfile1.txt

1. User types stuff into chat formspec. At this point it is stored as a core::stringw inside irrlicht.
2. User submits the form. guiFormSpecMenu.cpp converts the text to utf8 for submitting it as a formspec field.
3. Since this is the chat formspec, code in game.cpp intercepts the formspec submission.
4. game.cpp:186 calls narrow_to_wide on the string.

Result: a utf8 string is interpreted as a narrow string for conversion to wide string.

--> on Linux: no effect because narrow == utf8
--> on Windows: BOOM, narrow means CP_ACP, not CP_UTF8.