LibHTML: Update the removed node's siblings in TreeNode::remove_child()

Oops, we forgot to update the node's siblings' sibling pointers when
removing a node from the tree.

Thanks to Owlinated for pointing this out! :^)

1 files changed, 6 insertions, 0 deletions

diff --git a/Libraries/LibHTML/TreeNode.h b/Libraries/LibHTML/TreeNode.h
index ae84db165b..4459e4cfc0 100644
--- a/Libraries/LibHTML/TreeNode.h
+++ b/Libraries/LibHTML/TreeNode.h
@@ -121,6 +121,12 @@ inline NonnullRefPtr<T> TreeNode<T>::remove_child(NonnullRefPtr<T> node, bool ca
     if (m_last_child == node)
         m_last_child = node->m_previous_sibling;
 
+    if (node->m_next_sibling)
+        node->m_next_sibling->m_previous_sibling = node->m_previous_sibling;
+
+    if (node->m_previous_sibling)
+        node->m_previous_sibling->m_next_sibling = node->m_next_sibling;
+
     node->m_next_sibling = nullptr;
     node->m_previous_sibling = nullptr;
     node->m_parent = nullptr;