From 2260948b7bda08f00616c2ce678bed1da69eb96c Mon Sep 17 00:00:00 2001
From: anderium <33520919+anderium@users.noreply.github.com>
Date: Wed, 13 Aug 2025 14:39:09 +0200
Subject: [PATCH] Add changeset and integration test

---
 .changeset/spicy-ties-see.md                      |  5 +++++
 .../integration/rendering/flowchart-elk.spec.js   | 15 +++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 .changeset/spicy-ties-see.md

diff --git a/.changeset/spicy-ties-see.md b/.changeset/spicy-ties-see.md
new file mode 100644
index 000000000..25fc643e0
--- /dev/null
+++ b/.changeset/spicy-ties-see.md
@@ -0,0 +1,5 @@
+---
+'@mermaid-js/layout-elk': patch
+---
+
+Make elk not force node model order, but strongly consider it instead
diff --git a/cypress/integration/rendering/flowchart-elk.spec.js b/cypress/integration/rendering/flowchart-elk.spec.js
index 27af2c40c..312e1d5b4 100644
--- a/cypress/integration/rendering/flowchart-elk.spec.js
+++ b/cypress/integration/rendering/flowchart-elk.spec.js
@@ -1053,6 +1053,21 @@ flowchart LR
       });
     });
   });
+
+  it('6647-elk: should keep node order when using elk layout unless it would add crossings', () => {
+    imgSnapshotTest(
+      `---
+config:
+  layout: elk
+---
+      flowchart TB
+        a --> a1 & a2 & a3 & a4
+        b --> b1 & b2
+        b2 --> b3
+        b1 --> b4
+      `
+    );
+  });
 });
 
 describe('Title and arrow styling #4813', () => {