Is your feature request related to a problem? Please describe.

My internal windows manger tool will read the _NET_WM_PID atom from X11 window to know the Process Id. The internal windows manger tool works well on the GTK application, because the GTK application will set the _NET_WM_PID atom. But it can not work with the Avalonia application, because the Avalonia application do not set the _NET_WM_PID atom.

Describe the solution you'd like

I want to add the _NET_WM_PID when the X11 window be created in Avalonia.

And I find the Avalonia already define the _NET_WM_PID atom:

Describe alternatives you've considered

No response

Additional context

gdkwindow-x11.c:

      long pid = getpid ();
      XChangeProperty (xdisplay, xid,
                       gdk_x11_get_xatom_by_name_for_display (x11_screen->display, "_NET_WM_PID"),
                       XA_CARDINAL, 32,
                       PropModeReplace,
                       (guchar *)&pid, 1);