Ide Vala thread

Ide.ThreadPool.push (Ide.ThreadPoolKind.INDEXER, () => {
                int res_line = -1;
                int res_column = -1;
                this.results = index.code_complete (file.file,
                                       iter.get_line () + 1,
                                       iter.get_line_offset () + 1,
                                       line,
                                       unsaved_files,
                                       this,
                                       cancellable,
                                       out res_line,
                                       out res_column);
                    if (res_line > 0 && res_column > 0) {
                    this.line = res_line - 1;
                    this.column = res_column - 1;
                }

                if (!cancellable.is_cancelled ())
                    Idle.add (() => {
                        if (results.replay (query))
                            results.present (this, context);
                        return false;
                    });
            });