disconnectedCallback() {
      const ctor = this.constructor;
      const slotsAreManaged = ctor.getMetadata().slotsAreManaged();
      this._inDOM = false;
      if (slotsAreManaged) {
        this._stopObservingDOMChildren();
      }
      if (this._fullyConnected) {
        this.onExitDOM();
        this._fullyConnected = false;
      }
      if (this.staticAreaItem && this.staticAreaItem.parentElement) {
        this.staticAreaItem.parentElement.removeChild(this.staticAreaItem);
      }
      (0, _Render.cancelRender)(this);
    }
Do not call this method from derivatives of UI5Element, use "onExitDOM" only
@private