<p>In <a href="https://github.com/geany/geany-plugins/pull/324#discussion_r49946621">lineoperations/src/lineoperations.c</a>:</p>
<pre style='color:#555'>> +    gtk_menu_shell_append(GTK_MENU_SHELL(submenu), sep2);
> +  gtk_menu_shell_append(GTK_MENU_SHELL(submenu), sortasc_item);
> +  gtk_menu_shell_append(GTK_MENU_SHELL(submenu), sortdesc_item);
> +
> +  gtk_menu_item_set_submenu(GTK_MENU_ITEM(main_menu_item), submenu);
> +
> +  gtk_container_add(GTK_CONTAINER(geany->main_widgets->tools_menu), main_menu_item);
> +
> +
> +  g_signal_connect(rmdupst_item, "activate", G_CALLBACK(action_rmdupst_item), NULL);
> +  g_signal_connect(rmdupln_item, "activate", G_CALLBACK(action_rmdupln_item), NULL);
> +  g_signal_connect(rmunqln_item, "activate", G_CALLBACK(action_rmunqln_item), NULL);
> +  g_signal_connect(rmemtyln_item, "activate", G_CALLBACK(action_rmemtyln_item), NULL);
> +  g_signal_connect(rmwhspln_item, "activate", G_CALLBACK(action_rmwhspln_item), NULL);
> +  g_signal_connect(sortasc_item, "activate", G_CALLBACK(action_sortasc_item), NULL);
> +  g_signal_connect(sortdesc_item, "activate", G_CALLBACK(action_sortdesc_item), NULL);
</pre>
<p>Similarly (but more straightforward), you could pass the flag whether to sort ascending or descending through the user data parameter.</p>

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