bugfix / timeslider: only update timeslider on correct message type -- resolves #4100
bugfix / timeslider: only update timeslider on correct message type -- resolves #4100


storytouch/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite