don't show warning on duplicate event (#986)
don't show warning on duplicate event (#986)


switchinnovations/pxt,playi/pxt,switch-education/pxt,playi/pxt,switchinnovations/pxt,switchinnovations/pxt,Microsoft/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,Microsoft/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt