Program: 17386
Project: 17386
Buggy source:
public ICompletionProposal[] getTagProposals(IAssistState state){
  if (state.getTriggerData() != ',' && state.getTriggerData() != '(') {
    return null;
  }
  if (state.getTriggerData() == ' ' || state.getTriggerData() == '\t') {
    return null;
  }
  if (!checkContext(state))   return null;
 else {
    Set params=((ISyntaxDictionary)this.sourceDict).getFunctionParams(this.functionName);
    String helpText=((ISyntaxDictionary)this.sourceDict).getFunctionHelp(this.functionName);
    if (params == null) {
      params=new LinkedHashSet();
      CFDocument doc=((ICFDocument)state.getIDocument()).getCFDocument();
      DocItem rootItem=doc.getDocumentRoot();
      Matcher matcher;
      Pattern pattern;
      String name="String_Node_Str", type="String_Node_Str", required="String_Node_Str", defaultvalue="String_Node_Str";
      pattern=Pattern.compile("String_Node_Str",Pattern.CASE_INSENSITIVE);
      nodes=rootItem.selectNodes("String_Node_Str");
      Iterator i=nodes.iterator();
      while (i.hasNext()) {
        DocItem currItem=(DocItem)i.next();
        if (currItem.getItemData().indexOf(this.functionName) > 0) {
          if (currItem.getFirstChild().getName().equals("String_Node_Str")) {
            CFNodeList childNodes=currItem.getChildNodes();
            int x=0;
            DocItem childNode=(DocItem)childNodes.get(x);
            while (childNode.getName().equals("String_Node_Str")) {
              matcher=pattern.matcher(childNode.getItemData());
              while (matcher.find()) {
                String value=matcher.group(2).replaceAll("String_Node_Str","String_Node_Str").replaceAll("String_Node_Str","String_Node_Str");
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  name=value;
                }
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  type=value;
                }
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  required=value;
                }
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  defaultvalue=value;
                }
              }
              Parameter newParam=new Parameter(name,type,Boolean.valueOf(required),defaultvalue);
              params.add(newParam);
              System.out.println(currItem.getFirstChild().getItemData());
              childNode=(DocItem)nodes.get(x);
              x++;
            }
          }
        }
      }
      if (params == null) {
        return null;
      }
    }
    Parameter[] filteredParams=getFilteredParams(params);
    int x=0;
    String extraInfo=paramIndent + "String_Node_Str" + functionName+ "String_Node_Str";
    Parameter activeParam=null;
    int paramCount=filteredParams.length;
    while (x < paramCount) {
      Parameter p=filteredParams[x];
      String delimiter="String_Node_Str";
      if (x + 1 < paramCount) {
        delimiter="String_Node_Str";
      }
      extraInfo+=paramIndent + paramIndent;
      if (x == this.paramsSoFar) {
        activeParam=p;
        extraInfo+="String_Node_Str";
      }
      extraInfo+=p.toString() + delimiter;
      if (x == this.paramsSoFar) {
        extraInfo+="String_Node_Str";
      }
      extraInfo+="String_Node_Str";
      x++;
    }
    if (this.paramsSoFar == paramCount) {
      return null;
    }
    extraInfo+=paramIndent + "String_Node_Str";
    extraInfo+=helpText;
    return getParamProposals(activeParam,extraInfo,state.getOffset(),paramCount);
  }
}

Fixed version (ground truth):
public ICompletionProposal[] getTagProposals(IAssistState state){
  fState=state;
  if (state.getTriggerData() != ',' && state.getTriggerData() != '(') {
    return null;
  }
  if (state.getTriggerData() == ' ' || state.getTriggerData() == '\t') {
    return null;
  }
  if (!checkContext(state))   return null;
 else {
    Set params=((ISyntaxDictionary)this.sourceDict).getFunctionParams(this.functionName);
    String helpText=((ISyntaxDictionary)this.sourceDict).getFunctionHelp(this.functionName);
    if (params == null) {
      params=new LinkedHashSet();
      CFDocument doc=((ICFDocument)state.getIDocument()).getCFDocument();
      DocItem rootItem=doc.getDocumentRoot();
      Matcher matcher;
      Pattern pattern;
      String name="String_Node_Str", type="String_Node_Str", required="String_Node_Str", defaultvalue="String_Node_Str";
      pattern=Pattern.compile("String_Node_Str",Pattern.CASE_INSENSITIVE);
      nodes=rootItem.selectNodes("String_Node_Str");
      Iterator i=nodes.iterator();
      while (i.hasNext()) {
        DocItem currItem=(DocItem)i.next();
        if (currItem.getItemData().indexOf(this.functionName) > 0) {
          if (currItem.getFirstChild().getName().equals("String_Node_Str")) {
            CFNodeList childNodes=currItem.getChildNodes();
            int x=0;
            DocItem childNode=(DocItem)childNodes.get(x);
            while (childNode.getName().equals("String_Node_Str")) {
              matcher=pattern.matcher(childNode.getItemData());
              while (matcher.find()) {
                String value=matcher.group(2).replaceAll("String_Node_Str","String_Node_Str").replaceAll("String_Node_Str","String_Node_Str");
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  name=value;
                }
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  type=value;
                }
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  required=value;
                }
                if (matcher.group(1).toLowerCase().equals("String_Node_Str")) {
                  defaultvalue=value;
                }
              }
              Parameter newParam=new Parameter(name,type,Boolean.valueOf(required),defaultvalue);
              params.add(newParam);
              System.out.println(currItem.getFirstChild().getItemData());
              childNode=(DocItem)nodes.get(x);
              x++;
            }
          }
        }
      }
      if (params == null) {
        return null;
      }
    }
    Parameter[] filteredParams=getFilteredParams(params);
    int x=0;
    String extraInfo=paramIndent + "String_Node_Str" + functionName+ "String_Node_Str";
    Parameter activeParam=null;
    int paramCount=filteredParams.length;
    while (x < paramCount) {
      Parameter p=filteredParams[x];
      String delimiter="String_Node_Str";
      if (x + 1 < paramCount) {
        delimiter="String_Node_Str";
      }
      extraInfo+=paramIndent + paramIndent;
      if (x == this.paramsSoFar) {
        activeParam=p;
        extraInfo+="String_Node_Str";
      }
      extraInfo+=p.toString() + delimiter;
      if (x == this.paramsSoFar) {
        extraInfo+="String_Node_Str";
      }
      extraInfo+="String_Node_Str";
      x++;
    }
    if (this.paramsSoFar == paramCount) {
      return null;
    }
    extraInfo+=paramIndent + "String_Node_Str";
    extraInfo+=helpText;
    return getParamProposals(activeParam,extraInfo,state.getOffset(),paramCount);
  }
}