triggerChange() gets called when the previous value has been selected again

[lmeurs]

After openening a select one might want to close it by clicking the previously selected option. Though the value has not changed, Select.prototype.pickOption() still calls this.triggerChange() which causes our AJAX form to submit.

We could add a valueHasChanged flag and check this before calling this.triggerChange():

Select.prototype.pickOption = function(option, close) {
  var _this = this, valueHasChanged;
  if (close == null) {
    close = true;
  }
  valueHasChanged = this.value !== option.getAttribute('data-value');
  this.value = this.select.value = option.getAttribute('data-value');
  if (valueHasChanged) {
    this.triggerChange();
  }
  if (close) {
    return setTimeout(function() {
      _this.close();
      return _this.target.focus();
    });
  }
};