From fd3161b767ff60214208279966208a5ae0bd9eb8 Mon Sep 17 00:00:00 2001
From: Doug Martin <dmartin@concord.org>
Date: Wed, 3 Apr 2024 06:13:02 -0400
Subject: [PATCH] fix: Moving a state node should not trigger a re-layout
 [PT-187321170]

---
 src/components/graph.tsx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/components/graph.tsx b/src/components/graph.tsx
index a875ed6..8b01366 100644
--- a/src/components/graph.tsx
+++ b/src/components/graph.tsx
@@ -546,11 +546,17 @@ export const Graph = (props: Props) => {
       while (simulation.alpha() > simulation.alphaMin()) {
         simulation.tick();
       }
+
+      // pin the nodes so that dragging does not cause a force layout change
+      d3Graph.nodes
+        .forEach((d: any) => {
+          d.fx = d.x;
+          d.fy = d.y;
+        });
     }
 
     // calculate the edge positions
     d3Graph.edges = calculateEdges(d3Graph.edges);
-    // d3Graph.nodes = calculateLoops(d3Graph);
 
     const lineBackgroundClass = [
       "edge-background",