randr: send RRProviderChangeNotify event
Send RRProviderChangeNotify event when a provider becomes output source or offload sink. Reviewed-by:Dave Airlie <airlied@redhat.com> Signed-off-by:
Michal Srb <msrb@suse.com> Signed-off-by:
Keith Packard <keithp@keithp.com>