Comment 1 for bug 175719

Now forcing the window to move into correct position on first pass windowproperty callback. This should be WM independent, but may still not capture all WM inconsistencies.

Initial cause was related to this:
"gtk_window_get_position() is not 100% reliable because the X Window System does not specify a way to obtain the geometry of the decorations placed on a window by the window manager. Thus GTK+ is using a "best guess" that works with most window managers." (http://library.gnome.org/devel/gtk/unstable/GtkWindow.html)