[import-backend] move gnc_import_TransInfo_remove_top_match to backend

because removing the first in a GList is a backend type action, and
converting to stl container will be easier then.

gnucash/import-export/import-backend.cpp

@@ -128,7 +128,7 @@ gnc_import_TransInfo_get_match_list (const GNCImportTransInfo *info)
     return info->match_list;
 }
 
-void
+static void
 gnc_import_TransInfo_set_match_list (GNCImportTransInfo *info, GList* match_list)
 {
     g_assert (info);
@@ -142,6 +142,14 @@ gnc_import_TransInfo_set_match_list (GNCImportTransInfo *info, GList* match_list
     }
 }
 
+void
+gnc_import_TransInfo_remove_top_match (GNCImportTransInfo *info)
+{
+    GList* match_trans = gnc_import_TransInfo_get_match_list (info);
+    match_trans = g_list_remove (match_trans, static_cast<gpointer>(match_trans->data));
+    gnc_import_TransInfo_set_match_list (info, match_trans);
+}
+
 Transaction *
 gnc_import_TransInfo_get_trans (const GNCImportTransInfo *info)
 {

gnucash/import-export/import-backend.h

@@ -182,8 +182,8 @@ void gnc_import_TransInfo_delete (GNCImportTransInfo *info);
 /** Returns the stored list of possible matches. */
 GList *gnc_import_TransInfo_get_match_list (const GNCImportTransInfo *info);
 
-/** Assigns the list of possible matches. */
-void gnc_import_TransInfo_set_match_list (GNCImportTransInfo *info, GList* match_list);
+/** Remove the first match in the list of possible matches  */
+void gnc_import_TransInfo_remove_top_match (GNCImportTransInfo *info);
 
 /** Returns the transaction of this TransInfo. */
 Transaction *gnc_import_TransInfo_get_trans (const GNCImportTransInfo *info);

gnucash/import-export/import-main-matcher.c

@@ -385,16 +385,10 @@ get_conflict_list (GtkTreeModel* model, GtkTreeIter import_iter, GncGUID* id, gi
 }
 
 static void
-remove_top_matches (GNCImportMainMatcher* gui, GtkTreeModel* model, GList* conflicts)
+remove_top_matches (GList* conflicts)
 {
-    GList* iter = conflicts;
-    for (; iter && iter->data; iter=iter->next)
-    {
-        GNCImportTransInfo* trans_info = iter->data;
-        GList* match_trans = gnc_import_TransInfo_get_match_list (trans_info);
-        match_trans = g_list_remove (match_trans, match_trans->data);
-        gnc_import_TransInfo_set_match_list (trans_info, match_trans);
-    }
+    for (GList* iter = conflicts; iter && iter->data; iter=iter->next)
+        gnc_import_TransInfo_remove_top_match (iter->data);
 }
 
 static void
@@ -426,7 +420,7 @@ resolve_conflicts (GNCImportMainMatcher *info)
 
         if (conflicts)
         {
-            remove_top_matches (info, model, conflicts);
+            remove_top_matches (conflicts);
             /* Go back to the beginning here, because a nth choice
              * could now conflict with a previously assigned first choice. */
             valid = gtk_tree_model_get_iter_first (model, &import_iter);