Function cancelPreviewEvent

app/core/store/modules/events.js:80–82

(state, id = 'temp-event')

      Vue.set(state.events, event._id, event)
    },
    cancelPreviewEvent (state, id = 'temp-event') {
      Vue.delete(state.events, id)
    },
    selectEvent (state, { eventId, event, instance } = {}) {
      if (eventId) {
        event = state.events[eventId]