[gnumeric] ssconvert: sort exporter and importer lists

[Morten Welinder <mortenw src gnome org>]

commit 4dc1d1afd8c84bcf65348bb092ba3fef9dee8232
Author: Morten Welinder <terra gnome org>
Date:   Thu May 10 20:25:10 2018 -0400

    ssconvert: sort exporter and importer lists

 src/ssconvert.c |   18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/src/ssconvert.c b/src/ssconvert.c
index 8ab3595..3d09cd8 100644
--- a/src/ssconvert.c
+++ b/src/ssconvert.c
@@ -243,18 +243,28 @@ handle_export_options (GOFileSaver *fs, GODoc *doc)
 }
 
 
-typedef gchar const *(*get_desc_f)(void *);
+typedef gchar const *(*get_desc_f)(const void *);
+
+static int
+by_his_id (gconstpointer a, gconstpointer b, gpointer user)
+{
+       get_desc_f get_his_id = user;
+       return strcmp (get_his_id (a), get_his_id (b));
+}
 
 static void
 list_them (GList *them,
           get_desc_f get_his_id,
           get_desc_f get_his_description)
 {
+       GList *them_copy = g_list_copy (them);
        GList *ptr;
        guint len = 0;
        gboolean interactive;
 
-       for (ptr = them; ptr ; ptr = ptr->next) {
+       them_copy = g_list_sort_with_data (them_copy, by_his_id, get_his_id);
+
+       for (ptr = them_copy; ptr; ptr = ptr->next) {
                GObject *obj = ptr->data;
                char const *id;
 
@@ -271,7 +281,7 @@ list_them (GList *them,
                    /* Translate these? */
                    "ID",
                    "Description");
-       for (ptr = them; ptr ; ptr = ptr->next) {
+       for (ptr = them_copy; ptr ; ptr = ptr->next) {
                GObject *obj = ptr->data;
                char const *id;
 
@@ -285,6 +295,8 @@ list_them (GList *them,
                            id,
                            (*get_his_description) (ptr->data));
        }
+
+       g_list_free (them_copy);
 }
 
 /*