message: Fix the shell prompt disappearing bug when executing commands with the shell scroll out of view
  This problem could be triggered by pasting text directly into the shell.
diff: @@ -516,6 +516,7 @@ export class EtTerminal extends ThemeableElementBase implements CommandPaletteRe
  this._elementAttached = true;
  this._stashArea = window.document.createDocumentFragment();
  + this._stashArea.addEventListener(VirtualScrollArea.EVENT_RESIZE, this._handleVirtualScrollableResize.bind(this));
  const shadow = this.attachShadow({ mode: 'open', delegatesFocus: false });
  const clone = this._createClone();
  shadow.appendChild(clone);
  @@ -1028,7 +1029,12 @@ export class EtTerminal extends ThemeableElementBase implements CommandPaletteRe
  }
  private _handleVirtualScrollableResize(ev: CustomEvent): void {
  - this._updateVirtualScrollableSize(<any> ev.target);
  + const el = <HTMLElement & VirtualScrollable> ev.target;
  + if (el.parentNode === this._stashArea) {
  + this._scheduleStashedChildResize(el);
  + } else {
  + this._updateVirtualScrollableSize(el);
  + }
  }
  private _markVisible(scrollable: VirtualScrollable, visible: boolean): void {
  