[gtk+] treemodelfilter: Make the constructor binding friendly

[Jasper St. Pierre <jstpierre src gnome org>]

commit 7ee5e7af702a6b2794ee6529a617e8dd7af1944a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Jul 15 21:14:33 2012 -0400

    treemodelfilter: Make the constructor binding friendly
    
    This means reffing the root in the set property implementation,
    rather than in the constructor. We don't need to unref the root
    on set, as it's a CONSTRUCT_ONLY property.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=680065

 gtk/gtktreemodelfilter.c |   30 +++++++++++-------------------
 1 files changed, 11 insertions(+), 19 deletions(-)
---
diff --git a/gtk/gtktreemodelfilter.c b/gtk/gtktreemodelfilter.c
index a8ef24b..45281c2 100644
--- a/gtk/gtktreemodelfilter.c
+++ b/gtk/gtktreemodelfilter.c
@@ -3758,10 +3758,14 @@ gtk_tree_model_filter_set_root (GtkTreeModelFilter *filter,
 {
   g_return_if_fail (GTK_IS_TREE_MODEL_FILTER (filter));
 
-  if (!root)
-    filter->priv->virtual_root = NULL;
+  if (root)
+    {
+      filter->priv->virtual_root = gtk_tree_path_copy (root);
+      gtk_tree_model_filter_ref_path (filter, filter->priv->virtual_root);
+      filter->priv->virtual_root_deleted = FALSE;
+    }
   else
-    filter->priv->virtual_root = gtk_tree_path_copy (root);
+    filter->priv->virtual_root = NULL;
 }
 
 /* public API */
@@ -3782,24 +3786,12 @@ GtkTreeModel *
 gtk_tree_model_filter_new (GtkTreeModel *child_model,
                            GtkTreePath  *root)
 {
-  GtkTreeModel *retval;
-  GtkTreeModelFilter *filter;
-
   g_return_val_if_fail (GTK_IS_TREE_MODEL (child_model), NULL);
 
-  retval = g_object_new (GTK_TYPE_TREE_MODEL_FILTER, 
-			 "child-model", child_model,
-			 "virtual-root", root,
-			 NULL);
-
-  filter = GTK_TREE_MODEL_FILTER (retval);
-  if (filter->priv->virtual_root)
-    {
-      gtk_tree_model_filter_ref_path (filter, filter->priv->virtual_root);
-      filter->priv->virtual_root_deleted = FALSE;
-    }
-
-  return retval;
+  return g_object_new (GTK_TYPE_TREE_MODEL_FILTER,
+                       "child-model", child_model,
+                       "virtual-root", root,
+                       NULL);
 }
 
 /**