Service: filter changesets when performing writes such that changed events are only emitted if new values differ from existing values

1 files changed, 14 insertions, 10 deletions

diff --git a/service/dconf-writer.c b/service/dconf-writer.c
index 26f66dd..8b59019 100644
--- a/service/dconf-writer.c
+++ b/service/dconf-writer.c
@@ -130,21 +130,25 @@ dconf_writer_real_change (DConfWriter    *writer,
                           const gchar    *tag)
 {
   g_return_if_fail (writer->priv->uncommited_values != NULL);
+  DConfChangeset *effective_changeset = dconf_changeset_filter_changes (writer->priv->uncommited_values,
+                                                                        changeset);
 
-  dconf_changeset_change (writer->priv->uncommited_values, changeset);
-
-  if (tag)
+  if (effective_changeset)
     {
-      TaggedChange *change;
+      dconf_changeset_change (writer->priv->uncommited_values, effective_changeset);
+      if (tag)
+        {
+          TaggedChange *change;
 
-      change = g_slice_new (TaggedChange);
-      change->changeset = dconf_changeset_ref (changeset);
-      change->tag = g_strdup (tag);
+          change = g_slice_new (TaggedChange);
+          change->changeset = dconf_changeset_ref (effective_changeset);
+          change->tag = g_strdup (tag);
 
-      g_queue_push_tail (&writer->priv->uncommited_changes, change);
-    }
+          g_queue_push_tail (&writer->priv->uncommited_changes, change);
+        }
 
-  writer->priv->need_write = TRUE;
+      writer->priv->need_write = TRUE;
+    }
 }
 
 static gboolean