Program: 151585
Project: 151585
Buggy source:
/** 
 * Print out the candidates. If the size of the candidates is greater than the  {@link org.jboss.forge.shell.console.ConsoleReader#getAutoprintThreshold}, they prompt with a warning.
 * @param candidates the list of candidates to print
 */
public void printCandidates(final ConsoleReader reader,Collection<CharSequence> candidates) throws IOException {
  Set<CharSequence> distinct=new HashSet<CharSequence>(candidates);
  if (distinct.size() > reader.getAutoprintThreshold()) {
    reader.print(Messages.DISPLAY_CANDIDATES.format(candidates.size()));
    reader.flush();
    int c;
    String noOpt=Messages.DISPLAY_CANDIDATES_NO.format();
    String yesOpt=Messages.DISPLAY_CANDIDATES_YES.format();
    char[] allowed={yesOpt.charAt(0),noOpt.charAt(0)};
    while ((c=reader.readCharacter(allowed)) != -1) {
      String tmp=new String(new char[]{(char)c});
      if (noOpt.startsWith(tmp)) {
        reader.println();
        return;
      }
 else       if (yesOpt.startsWith(tmp)) {
        break;
      }
 else {
        reader.beep();
      }
    }
  }
  if (distinct.size() != candidates.size()) {
    Collection<CharSequence> copy=new ArrayList<CharSequence>();
    for (    CharSequence next : candidates) {
      if (!copy.contains(next)) {
        copy.add(next);
      }
    }
    candidates=copy;
  }
  reader.println();
  Collection<CharSequence> colorizedCandidates=new ArrayList<CharSequence>();
  for (  CharSequence seq : candidates) {
    boolean processed=false;
    if (commandHolder.getState() != null) {
      CommandMetadata command=commandHolder.getState().getCommand();
      if ((command != null) && seq.toString().startsWith("String_Node_Str")) {
        String str=seq.toString().trim();
        if (str.startsWith("String_Node_Str")) {
          str=str.substring(2);
        }
        if (command.hasOption(str) && command.getNamedOption(str).isRequired()) {
          seq=shell.renderColor(ShellColor.BLUE,seq.toString());
          colorizedCandidates.add(seq);
          processed=true;
        }
      }
    }
    if (!processed) {
      colorizedCandidates.add(seq);
    }
  }
  reader.printColumns(colorizedCandidates);
}

Fixed version (ground truth):
/** 
 * Print out the candidates. If the size of the candidates is greater than the  {@link org.jboss.forge.shell.console.ConsoleReader#getAutoprintThreshold}, they prompt with a warning.
 * @param candidates the list of candidates to print
 */
public void printCandidates(final ConsoleReader reader,Collection<CharSequence> candidates) throws IOException {
  Set<CharSequence> distinct=new HashSet<CharSequence>(candidates);
  if (distinct.size() > reader.getAutoprintThreshold()) {
    reader.print(Messages.DISPLAY_CANDIDATES.format(candidates.size()));
    reader.flush();
    int c;
    String noOpt=Messages.DISPLAY_CANDIDATES_NO.format();
    String yesOpt=Messages.DISPLAY_CANDIDATES_YES.format();
    char[] allowed={yesOpt.charAt(0),noOpt.charAt(0)};
    while ((c=reader.readCharacter(allowed)) != -1) {
      String tmp=new String(new char[]{(char)c});
      if (noOpt.startsWith(tmp)) {
        reader.println();
        reader.flush();
        return;
      }
 else       if (yesOpt.startsWith(tmp)) {
        break;
      }
 else {
        reader.beep();
        reader.flush();
      }
    }
  }
  if (distinct.size() != candidates.size()) {
    Collection<CharSequence> copy=new ArrayList<CharSequence>();
    for (    CharSequence next : candidates) {
      if (!copy.contains(next)) {
        copy.add(next);
      }
    }
    candidates=copy;
  }
  reader.println();
  reader.flush();
  Collection<CharSequence> colorizedCandidates=new ArrayList<CharSequence>();
  for (  CharSequence seq : candidates) {
    boolean processed=false;
    if (commandHolder.getState() != null) {
      CommandMetadata command=commandHolder.getState().getCommand();
      if ((command != null) && seq.toString().startsWith("String_Node_Str")) {
        String str=seq.toString().trim();
        if (str.startsWith("String_Node_Str")) {
          str=str.substring(2);
        }
        if (command.hasOption(str) && command.getNamedOption(str).isRequired()) {
          seq=shell.renderColor(ShellColor.BLUE,seq.toString());
          colorizedCandidates.add(seq);
          processed=true;
        }
      }
    }
    if (!processed) {
      colorizedCandidates.add(seq);
    }
  }
  reader.printColumns(colorizedCandidates);
  reader.flush();
}