So, imagine a normal GUI window, but one of the components in it is a terminal window. Is there something like that?
Or should I just use mono font text view?
https://gitlab.gnome.org/GNOME/vte
Basically its usage starts with vte_terminal_new().
Unicode? Emojis? https://gitlab.gnome.org/GNOME/vte/-/blob/master/doc/ambiguo...
What hurts me? The only thing which hurts me is that the maintainer doesn’t like background transparency in the official terminal application. The library supports it and many terminals use it. But this is another topic. With an embedded terminal you will likely not use that feature ;)
PS: KDE likely has a smiliar solution within Qt. As you named portability either Gtk or Qt are you tools. The biggest hurdle is shipping the libraries on macOS. On Linux it is done automatically. Windows is rather easy. Regarding Gtk, ship the gdk-pixbuf loaders alongside, they are loaded at runtime via dlopen(). The small differences hurt during porting.