rbtree: Fix removing last element

The refactoring of automatically updating tree->root when setting a
node's parent works very well - unless all nodes get removed and no
node's parent got updated.

diff --git a/gtk/gtkrbtree.c b/gtk/gtkrbtree.c
index 4e521892330619290fa7127cc5e7dec9352484dc..85055b1cb4bb254592734a2886f0eb0ab3485054 100644 (file)
--- a/gtk/gtkrbtree.c
+++ b/gtk/gtkrbtree.c
@@ -708,6 +708,11 @@ gtk_rb_tree_remove (GtkRbTree *tree,
        p->right = x;
       gtk_rb_node_mark_dirty (p, TRUE);
     }
+  else
+    {
+      if (x == NULL)
+        tree->root = NULL;
+    }
 
   /* We need to clean up the validity of the tree.
    */