message: Send a batch update to Ace when setting multiple lines
diff: @@ -848,9 +848,7 @@ export class TerminalViewer extends ViewerElement implements SupportsClipboardPa
  }
  setTerminalLines(lines: TermApi.Line[]): void {
  - for (let i=0; i<lines.length; i++) {
  - this._aceEditor.setTerminalLine(i, lines[i]);
  - }
  + this._aceEditor.setTerminalLines(0, lines);
  this._isEmpty = false;
  emitResizeEvent(this);
  }
  