gdk:window-move-resize (window x y width height)

window -- a gdk:window object
x -- an integer with the new x position relative to window's parent
y -- an integer with the new y position relative to window's parent
width -- an integer with the new width
height -- an integer with the new height

Equivalent to calling the gdk:window-move and gdk:window-resize functions, except that both operations are performed at once, avoiding strange visual effects. I.e. the user may be able to see the window first move, then resize, if you do not use the gdk:window-move-resize function.