Found that Gtk::Socket not available in GTK 4
Must I create new widget or any other presets available?
There is no API in GTK4 that allows you to embed windowing system surfaces: that was only ever available on X11. Additionally, GTK4 does not support “foreign” windowing system surfaces: you can’t create a wrapper object around an X11 Window XID and tell GTK to consider it like a window it itself created.
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