[gtksourceview/wip/encodings] FileLoader: remove duplicated candidate encodings

[Sébastien Wilmet <swilmet src gnome org>]

commit 99cdda08ec73131a216a14f309ec6e07f2ce589a
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Aug 12 17:30:38 2014 +0200

    FileLoader: remove duplicated candidate encodings
    
    It'll be useful in gedit to prepend the metadata and GtkSourceFile's
    encodings, without the need to make
    _gtk_source_encoding_remove_duplicates() public.

 gtksourceview/gtksourcefileloader.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourcefileloader.c b/gtksourceview/gtksourcefileloader.c
index 6b3c20d..0193a01 100644
--- a/gtksourceview/gtksourcefileloader.c
+++ b/gtksourceview/gtksourcefileloader.c
@@ -27,6 +27,7 @@
 #include "gtksourcefile.h"
 #include "gtksourcebufferoutputstream.h"
 #include "gtksourceencoding.h"
+#include "gtksourceencoding-private.h"
 #include "gtksourceview-typebuiltins.h"
 #include "gtksourceview-i18n.h"
 
@@ -878,6 +879,9 @@ gtk_source_file_loader_new_from_stream (GtkSourceBuffer *buffer,
  * Sets the candidate encodings for the file loading. The encodings are tried in
  * the same order as the list.
  *
+ * For convenience, @candidate_encodings can contain duplicates. Only the first
+ * occurrence of a duplicated encoding is kept in the list.
+ *
  * By default the candidate encodings are (in that order):
  * 1. If set, the #GtkSourceFile's encoding. See gtk_source_file_get_encoding().
  * 2. The list returned by gtk_source_encoding_get_default_candidates().
@@ -888,8 +892,13 @@ void
 gtk_source_file_loader_set_candidate_encodings (GtkSourceFileLoader *loader,
                                                GSList              *candidate_encodings)
 {
+       GSList *list;
+
+       list = g_slist_copy (candidate_encodings);
+       list = _gtk_source_encoding_remove_duplicates (list, GTK_SOURCE_ENCODING_DUPLICATES_KEEP_FIRST);
+
        g_slist_free (loader->priv->candidate_encodings);
-       loader->priv->candidate_encodings = g_slist_copy (candidate_encodings);
+       loader->priv->candidate_encodings = list;
 }
 
 /**