Program: 24346
Project: 24346
Buggy source:
@Override public boolean onItemLongClick(AdapterView<?> parent,View view,int pos,long id){
  final int position=pos;
  AlertDialog.Builder builder=new AlertDialog.Builder(activity_context);
  builder.setCancelable(true).setPositiveButton("String_Node_Str",new DialogInterface.OnClickListener(){
    public void onClick(    DialogInterface dialog,    int id){
      String details=feed_list_adapter.get_info(position);
      String title=feed_list_adapter.getItem(position);
      details=details.substring(details.indexOf('\n') + 1,details.indexOf(' '));
      (new File(storage + "String_Node_Str" + title+ "String_Node_Str")).delete();
      (new File(storage + "String_Node_Str")).delete();
      (new File(storage + "String_Node_Str" + details+ "String_Node_Str")).delete();
      (new File(storage + details + "String_Node_Str")).delete();
      File all_file=new File(storage + "String_Node_Str" + details+ "String_Node_Str");
      List<String> feeds=read_file_to_list_static("String_Node_Str" + details + "String_Node_Str",0);
      all_file.delete();
      for (int i=0; i < feeds.size(); i++) {
        if (!feeds.get(i).contains(title))         append_string_to_file_static("String_Node_Str" + details + "String_Node_Str",feeds.get(i) + "String_Node_Str");
      }
      if (!(new File(storage + "String_Node_Str" + details+ "String_Node_Str")).exists()) {
        all_file=new File(storage + "String_Node_Str");
        feeds=read_file_to_list_static("String_Node_Str",0);
        all_file.delete();
        for (int i=0; i < feeds.size(); i++) {
          if (!feeds.get(i).contains(details))           append_string_to_file_static("String_Node_Str",feeds.get(i) + "String_Node_Str");
        }
      }
      feed_list_adapter.remove_item(position);
      feed_list_adapter.notifyDataSetChanged();
      all_file=new File(storage + "String_Node_Str");
      feeds=read_file_to_list_static("String_Node_Str",0);
      all_file.delete();
      for (int i=0; i < feeds.size(); i++) {
        if (!feeds.get(i).contains(title))         append_string_to_file_static("String_Node_Str",feeds.get(i) + "String_Node_Str");
      }
      feed_list_adapter.remove_item(position);
      feed_list_adapter.notifyDataSetChanged();
    }
  }
);
  AlertDialog alert=builder.create();
  alert.show();
  return true;
}

Fixed version (ground truth):
@Override public boolean onItemLongClick(AdapterView<?> parent,View view,int pos,long id){
  positionrr=pos;
  AlertDialog.Builder builder=new AlertDialog.Builder(activity_context);
  builder.setCancelable(true).setPositiveButton("String_Node_Str",new DialogInterface.OnClickListener(){
    public void onClick(    DialogInterface dialog,    int id){
      String details=feed_list_adapter.get_info(positionrr);
      String title=feed_list_adapter.getItem(positionrr);
      details=details.substring(details.indexOf('\n') + 1,details.indexOf(' '));
      (new File(storage + "String_Node_Str" + title+ "String_Node_Str")).delete();
      (new File(storage + "String_Node_Str")).delete();
      (new File(storage + "String_Node_Str" + details+ "String_Node_Str")).delete();
      (new File(storage + details + "String_Node_Str")).delete();
      File all_file=new File(storage + "String_Node_Str" + details+ "String_Node_Str");
      List<String> feeds=read_file_to_list_static("String_Node_Str" + details + "String_Node_Str",0);
      all_file.delete();
      for (int i=0; i < feeds.size(); i++) {
        if (!feeds.get(i).contains(title))         append_string_to_file_static("String_Node_Str" + details + "String_Node_Str",feeds.get(i) + "String_Node_Str");
      }
      if (!(new File(storage + "String_Node_Str" + details+ "String_Node_Str")).exists()) {
        all_file=new File(storage + "String_Node_Str");
        feeds=read_file_to_list_static("String_Node_Str",0);
        all_file.delete();
        for (int i=0; i < feeds.size(); i++) {
          if (!feeds.get(i).contains(details))           append_string_to_file_static("String_Node_Str",feeds.get(i) + "String_Node_Str");
        }
      }
      all_file=new File(storage + "String_Node_Str");
      feeds=read_file_to_list_static("String_Node_Str",0);
      all_file.delete();
      for (int i=0; i < feeds.size(); i++) {
        if (!feeds.get(i).contains(title))         append_string_to_file_static("String_Node_Str",feeds.get(i) + "String_Node_Str");
      }
      feed_list_adapter.remove_item(positionrr);
      feed_list_adapter.notifyDataSetChanged();
    }
  }
);
  AlertDialog alert=builder.create();
  alert.show();
  return true;
}