From 4d0d8c453bf9573bcffff7b0e32f8540d4e67ce4 Mon Sep 17 00:00:00 2001
From: AJ Isaacs <ajisaacs27@gmail.com>
Date: Fri, 20 Mar 2026 20:07:43 -0400
Subject: [PATCH] fix: guard stepSize <= 0 in NfpSlideStrategy to prevent
 infinite loop

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 OpenNest.Engine/BestFit/NfpSlideStrategy.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/OpenNest.Engine/BestFit/NfpSlideStrategy.cs b/OpenNest.Engine/BestFit/NfpSlideStrategy.cs
index e5426f9..f5dc2fb 100644
--- a/OpenNest.Engine/BestFit/NfpSlideStrategy.cs
+++ b/OpenNest.Engine/BestFit/NfpSlideStrategy.cs
@@ -20,6 +20,10 @@ namespace OpenNest.Engine.BestFit
         public List<PairCandidate> GenerateCandidates(Drawing drawing, double spacing, double stepSize)
         {
             var candidates = new List<PairCandidate>();
+
+            if (stepSize <= 0)
+                return candidates;
+
             var halfSpacing = spacing / 2;
 
             // Extract stationary polygon (Part1 at rotation 0), with spacing applied.