message: Fix a minor exception in TerminalCanvas.
diff: @@ -148,7 +148,7 @@ export class TerminalCanvas extends ThemeableElementBase implements AcceptsConfi
  });
  this._scrollBar.addEventListener('scroll', (ev: CustomEvent) => {
  - this._virtualScrollArea.scrollTo(this._scrollBar.position);
  + this._virtualScrollArea?.scrollTo(this._scrollBar.position);
  });
  this._scrollContainer.addEventListener('wheel', (ev: WheelEvent): void => {
  