This version has 2 new requests:
- gtk_shell1.notify_launch notifies the compositor that the requesting
  client shall launch another application. The given ID is expected to
  be unique.
- gtk_surface1.request_focus notifies the compositor that a surface
  requests focus due to it being activated. The given ID is passed to
  this process through undetermined means, if it corresponds with a
  current startup ID and there was no user interaction in between the
  surface will be focused, otherwise it will demand attention.