[gthumb] browser: do not load the metadata if the image changed

[Paolo Bacchilega <paobac src gnome org>]

commit 935465d02b3cd075938c5ec6715e8f88b0b56a59
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Sep 15 10:43:00 2013 +0200

    browser: do not load the metadata if the image changed

 gthumb/gth-browser.c |   37 ++++++++++++++++++++++++++-----------
 1 files changed, 26 insertions(+), 11 deletions(-)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index 2dc1190..6d33008 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -5685,6 +5685,18 @@ typedef struct {
 } LoadFileData;
 
 
+static void
+cancel_all_metadata_operations (GthBrowser  *browser)
+{
+       GList *scan;
+
+       for (scan = browser->priv->load_file_data_queue; scan; scan = scan->next) {
+               LoadFileData *data = scan->data;
+               g_cancellable_cancel (data->cancellable);
+       }
+}
+
+
 static LoadFileData *
 load_file_data_new (GthBrowser  *browser,
                    GthFileData *file_data,
@@ -5700,16 +5712,7 @@ load_file_data_new (GthBrowser  *browser,
        data->view = view;
        data->cancellable = g_cancellable_new ();
 
-       /* cancel all other file data operations */
-       {
-               GList *scan;
-
-               for (scan = browser->priv->load_file_data_queue; scan; scan = scan->next) {
-                       LoadFileData *data = scan->data;
-                       g_cancellable_cancel (data->cancellable);
-               }
-       }
-
+       cancel_all_metadata_operations (browser);
        browser->priv->load_file_data_queue = g_list_prepend (browser->priv->load_file_data_queue, data);
 
        return data;
@@ -5839,10 +5842,22 @@ static gboolean
 load_metadata_cb (gpointer user_data)
 {
        LoadFileData *data = user_data;
+       GthBrowser   *browser = data->browser;
        GList        *files;
 
+       if (browser->priv->load_metadata_timeout != 0) {
+               g_source_remove (browser->priv->load_metadata_timeout);
+               browser->priv->load_metadata_timeout = 0;
+       }
+
+       if ((browser->priv->current_file == NULL) ||
+           ! _g_file_equal (data->file_data->file, browser->priv->current_file->file))
+       {
+               return FALSE;
+       }
+
        load_file_data_ref (data);
-       files = g_list_prepend (NULL, data->browser->priv->current_file->file);
+       files = g_list_prepend (NULL, data->file_data->file);
        _g_query_all_metadata_async (files,
                                     GTH_LIST_DEFAULT,
                                     "*",