gtk_file_filter_add_pattern(filt_pdf, "*.pdf");
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER (dialog), filt_pdf);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER (dialog), filt_all);
gtk_file_filter_add_pattern(filt_pdf, "*.pdf");
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER (dialog), filt_pdf);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER (dialog), filt_all);