message: fix(left-nav): resetting items expanded after close hamb. menu
  ### Related Ticket(s)
  Web components: Masthead with L1 - Hamburger menu not getting reset, on closing from sub-menu options.
  ### Description
  Resetting items expanded after close hamb. menu
diff: /**
  * @license
  *
  - * Copyright IBM Corp. 2020
  + * Copyright IBM Corp. 2020, 2021
  *
  * This source code is licensed under the Apache-2.0 license found in the
  * LICENSE file in the root directory of this source tree.
  @@ -20,6 +20,7 @@ import Handle from '../../globals/internal/handle';
  import StableSelectorMixin from '../../globals/mixins/stable-selector';
  import DDSLeftNavOverlay from './left-nav-overlay';
  import styles from './masthead.scss';
  +import DDSLeftNavMenu from './left-nav-menu';
  const { prefix } = settings;
  const { stablePrefix: ddsPrefix } = ddsSettings;
  @@ -116,11 +117,19 @@ class DDSLeftNav extends StableSelectorMixin(BXSideNav) {
  const { expanded, _startSentinelNode: startSentinelNode, _endSentinelNode: endSentinelNode } = this;
  if (expanded) {
  this._hFocusWrap = focuswrap(this.shadowRoot!, [startSentinelNode, endSentinelNode]);
  - } else if (this._hFocusWrap) {
  + } else {
  + const { selectorNavItemsExpanded } = this.constructor as typeof DDSLeftNav;
  +
  + this.querySelectorAll(selectorNavItemsExpanded).forEach(ddsLeftNavMenu => {
  + (ddsLeftNavMenu as DDSLeftNavMenu).expanded = false;
  + });
  +
  + if (this._hFocusWrap) {
  this._hFocusWrap = this._hFocusWrap.release();
  }
  }
  }
  + }
  render() {
  return html`
  @@ -144,6 +153,13 @@ class DDSLeftNav extends StableSelectorMixin(BXSideNav) {
  return `${ddsPrefix}-left-nav-item,${ddsPrefix}-left-nav-menu,${ddsPrefix}-left-nav-menu-item`;
  }
  + /**
  + * A selector that will return expanded nav menus.
  + */
  + static get selectorNavItemsExpanded() {
  + return `${ddsPrefix}-left-nav-menu[expanded]`;
  + }
  +
  /**
  * A selector selecting tabbable nodes.
  */
  