message: fix: stop mouse down propagation at the beginning
diff: @@ -253,9 +253,10 @@ export class NgSelectComponent implements OnDestroy, OnChanges, AfterViewInit, C
  handleMousedown($event: MouseEvent) {
  const target = $event.target as HTMLElement;
  - if (target.tagName.toLowerCase() !== 'input') {
  + if (target.tagName !== 'INPUT') {
  $event.preventDefault();
  }
  + $event.stopPropagation();
  if (target.className === 'ng-clear') {
  this.handleClearClick();
  @@ -279,8 +280,6 @@ export class NgSelectComponent implements OnDestroy, OnChanges, AfterViewInit, C
  } else {
  this.toggle();
  }
  -
  - $event.stopPropagation();
  }
  handleArrowClick() {
  