Fix an off-by-one issue-- the destination level is the target's child, not the target itself.

1 files changed, 1 insertions, 1 deletions

diff --git a/core/libraries/ORM_MPTT.php b/core/libraries/ORM_MPTT.php
index 36065a69..4fa0a77a 100644
--- a/core/libraries/ORM_MPTT.php
+++ b/core/libraries/ORM_MPTT.php
@@ -222,7 +222,7 @@ class ORM_MPTT_Core extends ORM {
     $original_left = $this->left;
     $original_right = $this->right;
     $target_right = $target->right;
-    $level_delta = $target->level - $this->level;
+    $level_delta = ($target->level + 1) - $this->level;
 
     $this->lock();
     try {