[gthumb] avoid duplicates in the history

[Paolo Bacchilega <paobac src gnome org>]

commit 7399c6c0a567f1c4c21453befb4b6404a5b32158
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun May 16 09:49:16 2010 +0200

    avoid duplicates in the history
    
    [bug #615442]

 gthumb/gth-browser.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index 66e67de..c66f468 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -750,6 +750,21 @@ _gth_browser_add_to_history (GthBrowser *browser,
 		return;
 
 	if ((browser->priv->history_current == NULL) || ! g_file_equal (file, browser->priv->history_current->data)) {
+		GList *scan;
+
+		/* remove all the occurrences of file from the history */
+		for (scan = browser->priv->history_current; scan; /* void */) {
+			GList *next = scan->next;
+			GFile *file_in_history = scan->data;
+
+			if (g_file_equal (file, file_in_history)) {
+				browser->priv->history_current = g_list_remove_link (browser->priv->history_current, scan);
+				_g_object_list_unref (scan);
+			}
+
+			scan = next;
+		}
+
 		browser->priv->history = g_list_prepend (browser->priv->history, g_object_ref (file));
 		browser->priv->history_current = browser->priv->history;
 	}