@Nullable
  private SimpleThreesideDiffChange getChange(@NotNull ThreeSide side, int line) {
    for (SimpleThreesideDiffChange change : myViewer.getChanges()) {
      int startLine = change.getStartLine(side);
      int endLine = change.getEndLine(side);
      if (DiffUtil.isSelectedByLine(line, startLine, endLine) && change.isChange(side)) {
        return change;
      }
    }
    return null;
  }
@Nullable
  private SimpleThreesideDiffChange getChange(@NotNull ThreeSide side, int line)