message: Fix a bug in the Embedded viewer where is would sometimes collapse vertically.
diff: @@ -101,6 +101,8 @@ export class EmbeddedViewer extends ViewerElement implements Commandable,
  private _headerTop = 0;
  private _headerBottom = 0;
  + private _connectSetupDone = false;
  +
  constructor() {
  super();
  this._log = getLogger(EmbeddedViewer.TAG_NAME, this);
  @@ -117,9 +119,13 @@ export class EmbeddedViewer extends ViewerElement implements Commandable,
  connectedCallback(): void {
  super.connectedCallback();
  + if ( ! this._connectSetupDone) {
  this._setUpVirtualScrollArea();
  +
  // Remove the anti-flicker style.
  DomUtils.getShadowId(this, ID_CONTAINER).setAttribute('style', '');
  + this._connectSetupDone = true;
  + }
  }
  getMetadata(): ViewerElementMetadata {
  