Hide dropdown and flyout popouts when undo'ing / redo'ing (#4496)
Hide dropdown and flyout popouts when undo'ing / redo'ing (#4496)


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