ephyr: Send RRCrtcChangeNotify events on resize

After resizing Xephyr's window RRGetCrtcInfo returns the changed size,
but the RRCrtcChangeNotify event is not sent.
Call RRGetInfo(pScreen, TRUE) to update the current mode and send
notifications to clients.
3 jobs for xephyr-crtc in 6 minutes and 25 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Docker Image
passed debian-testing #238133

00:01:19

 
  Build And Test
passed autotools-build-and-test #238134

00:05:06

passed meson-build-and-test #238135

00:01:19