How to update the code below from GTK 3.x to GTK 4.x

Platform Core
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How to update the code below from GTK 3.x to GTK 4.x
Tip: m_window_values is a instance of Gtk.Window

int x = 0, y = 0, origin_x = 0, origin_y = 0;
this.get_window().get_origin(out origin_x, out origin_y);
Gdk.Device? pointer = this.get_display().get_default_seat().get_pointer();
this.get_window().get_device_position(pointer, out x, out y, null);
m_window_values.move(origin_x + x, origin_y + y + 20);
m_window_values.resize(400, 450);
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There is no way to do this using only GTK4, please read this thread for a further discussion: Gtk4 migration - window management functions gone

You will have to use your backend’s API (Xlib, Win32, etc) if you want to continue using this functionality.

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