Use any web browser or WebView as GUI, with your preferred language in the backend and modern web technologies in the frontend, all in a lightweight portable library.
"Build Text Editor Example (debug)..."
.../../lib/libmingw32.a(lib64_libmingw32_a-crtexewin.o):crtexewin.c:(.text.startup+0xbd): undefined reference to `WinMain'
cd examples\C\text-editor
mingw32-make debug