x11window: explicitly resize when the Xwayland scale changes
With how Xwayland scaling works, KWin assumes the window already uses the new coordinate system - but that doesn't happen until Xwayland and the client know about the new size as well.
With how Xwayland scaling works, KWin assumes the window already uses the new coordinate system - but that doesn't happen until Xwayland and the client know about the new size as well.