1 files changed, 21 insertions, 0 deletions
diff --git a/vendor/league/commonmark/src/Node/Node.php b/vendor/league/commonmark/src/Node/Node.php
index 07b0f75018..96644b7cdc 100644
--- a/vendor/league/commonmark/src/Node/Node.php
+++ b/vendor/league/commonmark/src/Node/Node.php
@@ -255,4 +255,25 @@ abstract class Node
     {
         return new NodeWalker($this);
     }
+
+    /**
+     * Clone the current node and its children
+     *
+     * WARNING: This is a recursive function and should not be called on deeply-nested node trees!
+     */
+    public function __clone()
+    {
+        // Cloned nodes are detached from their parents, siblings, and children
+        $this->parent = null;
+        $this->previous = null;
+        $this->next = null;
+        // But save a copy of the children since we'll need that in a moment
+        $children = $this->children();
+        $this->detachChildren();
+
+        // The original children get cloned and re-added
+        foreach ($children as $child) {
+            $this->appendChild(clone $child);
+        }
+    }
 }