void newRowSeparator(Character character, boolean isTableWideSeparator) {
    Row row = new Row(this, screen, character, isTableWideSeparator);
    rows.add(row);
  }
A group of rows. Widths for all columns within a group will be the same and when built will
automatically be set to the length of the longest value in the column.

@since GemFire 7.0
geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/result/RowGroup.java