backIndex method

void backIndex()

Implementation

void backIndex() {
  if (_cursorX == 0) return;
  if (_cursorX == _marginLeft && isInVerticalMargin) {
    for (var row = absoluteMarginTop; row <= absoluteMarginBottom; row++) {
      lines[row].insertCells(
        _marginLeft,
        1,
        _blankCellStyle,
        _marginRight + 1,
      );
    }
    return;
  }
  moveCursorX(-1);
}