message: fix(popover): no focus on button on Mac OS
  fixes
diff: @@ -67,6 +67,16 @@ export class PopoverDirective implements OnInit, OnDestroy {
  Object.assign(this, _config);
  this.onShown = this._popover.onShown;
  this.onHidden = this._popover.onHidden;
  +
  + // fix: no focus on button on Mac OS #1795
  + _elementRef.nativeElement.addEventListener('click', function() {
  + try {
  + _elementRef.nativeElement.focus();
  + } catch(err) {
  + return;
  + }
  + });
  +
  }
  /**
  