check if all options are already selected/deselected before triggering change
check if all options are already selected/deselected before triggering change

#1284

anhtranqs3/bootstrap4-select,wearespindle/select3,jesenko/bootstrap-select,silviomoreto/bootstrap-select,silviomoreto/bootstrap-select,wearespindle/select3,jesenko/bootstrap-select,anhtranqs3/bootstrap4-select