message: Fix clearRowToBeginning.
diff: @@ -806,10 +806,11 @@ export class Output extends events.EventEmitter {
  clearRowToBeginning() {
  if (this.storage.get(this.cursorRow)) {
  - const replacement = Array(this.cursorColumn).fill(space);
  + const count = this.cursorColumn + 1;
  + const replacement = Array(count).fill(space);
  this.storage = this.storage.update(
  this.cursorRow,
  - row => row.splice(0, this.cursorColumn + 1, ...replacement).toList());
  + row => row.splice(0, count, ...replacement).toList());
  }
  }
  