@Nullable
  private Revision getPegRevisionFromLeftSide(@NotNull TreeConflictDescription description) {
    Revision result = null;
    if (description.getSourceLeftVersion() != null) {
      long committed = description.getSourceLeftVersion().getPegRevision();
      if (myCommittedRevision != null &&
          myCommittedRevision.getRevision().getNumber() < committed &&
          myCommittedRevision.getRevision().isValid()) {
        committed = myCommittedRevision.getRevision().getNumber();
      }
      result = Revision.of(committed);
    }
    return result;
  }
@Nullable
  private Revision getPegRevisionFromLeftSide(@NotNull TreeConflictDescription description)