private int transferVisualLine(int masterVisualLine) {
      Editor master = getMaster();
      Editor slave = getSlave();

      int masterCenterLine = master.visualToLogicalPosition(new VisualPosition(masterVisualLine, 0)).line;
      Range range = myScrollable.getRange(mySide, masterCenterLine);

      int masterStart = logicalToVisualLine(master, range.start1);
      int masterEnd = range.start1 == range.end1 ? masterStart : logicalToVisualLine(master, range.end1);

      int slaveStart = logicalToVisualLine(slave, range.start2);
      int slaveEnd = range.start2 == range.end2 ? slaveStart : logicalToVisualLine(slave, range.end2);

      Range visualRange = new Range(masterStart, masterEnd, slaveStart, slaveEnd);
      return BaseSyncScrollable.transferLine(masterVisualLine, visualRange);
    }
private int transferVisualLine(int masterVisualLine)