text_spanner_->set_bound (LEFT, col);
text_spanner_->set_property ("text", short_text_);
text_spanner_->set_property ("long-text", long_text_);
text_spanner_->set_bound (LEFT, col);
text_spanner_->set_property ("text", short_text_);
text_spanner_->set_property ("long-text", long_text_);