GtkWidget *label = get_widget_assert (xml, "column-number-label");
GtkTextBuffer *buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview));
GtkWidget *label = get_widget_assert (xml, "column-number-label");
GtkTextBuffer *buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview));