From ea69d26a607769f47cb9dcf275c7cdb4e0e0fd56 Mon Sep 17 00:00:00 2001
From: Knut Sveidqvist <knsv@sveido.com>
Date: Mon, 10 Jun 2024 13:50:06 +0200
Subject: [PATCH] #5237 Fix for incorrect handling of self loops with elk
 layout

---
 packages/mermaid-layout-elk/src/find-common-ancestor.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/mermaid-layout-elk/src/find-common-ancestor.ts b/packages/mermaid-layout-elk/src/find-common-ancestor.ts
index ebdc01cf7..83990b2f3 100644
--- a/packages/mermaid-layout-elk/src/find-common-ancestor.ts
+++ b/packages/mermaid-layout-elk/src/find-common-ancestor.ts
@@ -7,6 +7,11 @@ export const findCommonAncestor = (id1: string, id2: string, treeData: TreeData)
   const { parentById } = treeData;
   const visited = new Set();
   let currentId = id1;
+
+  if (id1 === id2) {
+    return parentById[id1] || 'root';
+  }
+
   while (currentId) {
     visited.add(currentId);
     if (currentId === id2) {