To avoid direct callbacks from display drivers to win32u while changing display settings.
-- v4: winemac.drv: Resize desktop window on WM_DISPLAYCHANGE message. winex11.drv: Resize desktop window on WM_DISPLAYCHANGE message. win32u: Send WM_DISPLAYCHANGE message to the desktop window. winex11.drv: Send WM_X11DRV_CLIP_CURSOR_REQUEST message from the deskop. winex11.drv: Sync window positions in a WM_X11DRV_DESKTOP_RESIZED message.