From 3d03358bc57349f7c14a4b24d416a1ef2f974156 Mon Sep 17 00:00:00 2001
From: Pawel Baran <pawel.baran@burohappold.com>
Date: Thu, 15 Feb 2024 15:47:07 +0100
Subject: [PATCH] another attempt to fix #3284

---
 Geometry_Engine/Compute/BooleanUnion.cs | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/Geometry_Engine/Compute/BooleanUnion.cs b/Geometry_Engine/Compute/BooleanUnion.cs
index 7b3b86030..096305b18 100644
--- a/Geometry_Engine/Compute/BooleanUnion.cs
+++ b/Geometry_Engine/Compute/BooleanUnion.cs
@@ -488,13 +488,14 @@ private static List<Line> BooleanUnionCollinear(this List<Line> lines, double to
             extraSteps.Add(0, new List<double>());
             foreach (double step in steps)
             {
+                while (step - mergedRanges[i].Item2 > tolerance)
+                {
+                    i++;
+                    extraSteps.Add(i, new List<double>());
+                }
+
                 if (step - mergedRanges[i].Item1 > tolerance)
                 {
-                    if (step - mergedRanges[i].Item2 > tolerance)
-                    {
-                        i++;
-                        extraSteps.Add(i, new List<double>());
-                    }
 
                     if (mergedRanges[i].Item2 - step > tolerance && extraSteps[i].All(x => Math.Abs(x - step) > tolerance))
                         extraSteps[i].Add(step);