code: public boolean isMatchingAny(final int level) {
          if (level >= this.levelCounter) {
              throw new IllegalArgumentException(
                      "Cannot return current selection: max level is " + this.levelCounter + " (specified: " + level + ")");
          }
          if (this.levels == null) {
              return false;
          }
          return this.levels[level].isSelectionActive();
      }
docs: <p>
  Returns whether any selectors are currently matching at the specified selection level.
  </p>
  
  @param level the selection level.
  @return true if any selectors are matching at the specified level, false if not.