[devhelp] Preferences: fix sort function when not grouping by language

[Sébastien Wilmet <swilmet src gnome org>]

commit 79bc61586b5bb694a04241b65e16ad708e08a8df
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Apr 6 17:34:22 2018 +0200

    Preferences: fix sort function when not grouping by language
    
    In that case we must not compare the language, just the book titles.

 src/dh-preferences.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/dh-preferences.c b/src/dh-preferences.c
index 0a31abc..9df48e1 100644
--- a/src/dh-preferences.c
+++ b/src/dh-preferences.c
@@ -341,6 +341,7 @@ bookshelf_sort_func (GtkTreeModel *model,
                      GtkTreeIter  *iter_b,
                      gpointer      user_data)
 {
+        DhSettings *settings;
         DhBook *book_a;
         DhBook *book_b;
         gchar *title_a;
@@ -361,6 +362,12 @@ bookshelf_sort_func (GtkTreeModel *model,
                             COLUMN_TITLE, &title_b,
                             -1);
 
+        settings = dh_settings_get_default ();
+        if (!dh_settings_get_group_books_by_language (settings)) {
+                ret = dh_book_cmp_by_title (book_a, book_b);
+                goto out;
+        }
+
         if (book_a != NULL)
                 language_a = dh_book_get_language (book_a);
         else