Program: 11958
Project: 11958
Buggy source:
@Override public String trimAll(String src){
  if (src == null) {
    return null;
  }
  src=src.replaceAll(RegExp.CRLF,StringValue.Space);
  int len=src.length();
  boolean isInsideOfString=false;
  boolean isInsideOfChar=false;
  boolean isInsideOfTargetClass=false;
  boolean isInsideOfFirstBrace=false;
  boolean isInsideOfSecondBrace=false;
  Stack<Character> braceStack=new Stack<Character>();
  StringBuilder sb=new StringBuilder();
  for (int i=0; i < len; i++) {
    char current=src.charAt(i);
    if (i > 0) {
      if (current == '"') {
        int count=countPreviousContinuedBackslash(src,i,0);
        if (count % 2 == 0) {
          isInsideOfString=!isInsideOfString;
          sb.append(current);
          continue;
        }
      }
      if (!isInsideOfString && current == '\'') {
        int count=countPreviousContinuedBackslash(src,i,0);
        if (count % 2 == 0) {
          isInsideOfChar=!isInsideOfChar;
          sb.append(current);
          continue;
        }
      }
    }
    if (isInsideOfChar || isInsideOfString) {
      continue;
    }
    if (!isInsideOfTargetClass) {
      sb.append(current);
      if (i >= 6 && src.charAt(i - 6) == ' ' && src.charAt(i - 5) == 'c' && src.charAt(i - 4) == 'l' && src.charAt(i - 3) == 'a' && src.charAt(i - 2) == 's' && src.charAt(i - 1) == 's' && current == ' ') {
        isInsideOfTargetClass=true;
      }
 else       if (i >= 5 && src.charAt(i - 5) == ' ' && src.charAt(i - 4) == 'e' && src.charAt(i - 3) == 'n' && src.charAt(i - 2) == 'u' && src.charAt(i - 1) == 'm' && current == ' ') {
        isInsideOfTargetClass=true;
      }
      continue;
    }
    if (!isInsideOfFirstBrace) {
      sb.append(current);
      if (current == '{') {
        isInsideOfFirstBrace=true;
      }
      continue;
    }
    if (!isInsideOfSecondBrace) {
      sb.append(current);
    }
    if (current == '{') {
      isInsideOfSecondBrace=true;
      braceStack.push(current);
    }
    if (!braceStack.empty() && current == '}') {
      braceStack.pop();
      if (braceStack.empty()) {
        sb.append(current);
      }
    }
    if (braceStack.empty()) {
      isInsideOfSecondBrace=false;
    }
  }
  return sb.toString();
}

Fixed version (ground truth):
@Override public String trimAll(String src){
  if (src == null) {
    return null;
  }
  src=src.replaceAll(RegExp.CRLF,StringValue.Space).replaceAll(RegExp.LF,StringValue.Space);
  int len=src.length();
  boolean isInsideOfString=false;
  boolean isInsideOfChar=false;
  boolean isInsideOfTargetClass=false;
  boolean isInsideOfFirstBrace=false;
  boolean isInsideOfSecondBrace=false;
  Stack<Character> braceStack=new Stack<Character>();
  StringBuilder sb=new StringBuilder();
  for (int i=0; i < len; i++) {
    char current=src.charAt(i);
    if (i > 0) {
      if (current == '"') {
        int count=countPreviousContinuedBackslash(src,i,0);
        if (count % 2 == 0) {
          isInsideOfString=!isInsideOfString;
          sb.append(current);
          continue;
        }
      }
      if (!isInsideOfString && current == '\'') {
        int count=countPreviousContinuedBackslash(src,i,0);
        if (count % 2 == 0) {
          isInsideOfChar=!isInsideOfChar;
          sb.append(current);
          continue;
        }
      }
    }
    if (isInsideOfChar || isInsideOfString) {
      continue;
    }
    if (!isInsideOfTargetClass) {
      sb.append(current);
      if (i >= 6 && (src.charAt(i - 6) == ' ' || src.charAt(i - 6) == ';') && src.charAt(i - 5) == 'c' && src.charAt(i - 4) == 'l' && src.charAt(i - 3) == 'a' && src.charAt(i - 2) == 's' && src.charAt(i - 1) == 's' && current == ' ') {
        isInsideOfTargetClass=true;
      }
 else       if (i >= 5 && (src.charAt(i - 5) == ' ' || src.charAt(i - 5) == ';') && src.charAt(i - 4) == 'e' && src.charAt(i - 3) == 'n' && src.charAt(i - 2) == 'u' && src.charAt(i - 1) == 'm' && current == ' ') {
        isInsideOfTargetClass=true;
      }
      continue;
    }
    if (!isInsideOfFirstBrace) {
      sb.append(current);
      if (current == '{') {
        isInsideOfFirstBrace=true;
      }
      continue;
    }
    if (!isInsideOfSecondBrace) {
      sb.append(current);
    }
    if (current == '{') {
      isInsideOfSecondBrace=true;
      braceStack.push(current);
    }
    if (!braceStack.empty() && current == '}') {
      braceStack.pop();
      if (braceStack.empty()) {
        sb.append(current);
      }
    }
    if (braceStack.empty()) {
      isInsideOfSecondBrace=false;
    }
  }
  return sb.toString();
}