title: How to move a Gtk::Window with native widows api?
body: <h2>Background</h2>
  <p>I am developing an application in C++ with Gtkmm 4. I am creating a Gtk::Window. Now i want to move this window to the center of the screen. In Gtkmm 3 there were methods such as <code>Gtk::Window::set_position</code> and <code>Gtk::Window::move</code>, but they were removed in Gtkmm 4. I have already worked out how to get the screen size from <code>Gdk::Display</code>, and calculate the position.
  But, i have to use platform specific API to move my window. On Linux, there is X11 and Wayland, and i know how to do it with these.</p>
  <h2>Question</h2>
  <p>How can i move a <code>Gtk::Window</code> to a specific position on screen with native windows API ?</p>