From bee85570f73f164d8eb52edce77f3ea74824b90f Mon Sep 17 00:00:00 2001
From: FoggyFinder <FoggyFinder@yandex.ua>
Date: Thu, 24 Oct 2019 12:46:17 +0300
Subject: [PATCH 1/2] copy FusedAtoms

---
 CSharpMath/Atoms/Atom/MathAtom.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CSharpMath/Atoms/Atom/MathAtom.cs b/CSharpMath/Atoms/Atom/MathAtom.cs
index d4270a4d8..e8fccbd54 100644
--- a/CSharpMath/Atoms/Atom/MathAtom.cs
+++ b/CSharpMath/Atoms/Atom/MathAtom.cs
@@ -47,6 +47,8 @@ public MathAtom(MathAtomType type, string nucleus) {
     public MathAtom(MathAtom cloneMe, bool finalize) {
       AtomType = cloneMe.AtomType;
       Nucleus = cloneMe.Nucleus;
+      if (cloneMe.FusedAtoms != null)
+        FusedAtoms = new List<IMathAtom>(cloneMe.FusedAtoms);
       Superscript = AtomCloner.Clone(cloneMe.Superscript, finalize);
       Subscript = AtomCloner.Clone(cloneMe.Subscript, finalize);
       IndexRange = cloneMe.IndexRange;

From 4b8edc76063ae02c8c130169f3e75dc13a29d2af Mon Sep 17 00:00:00 2001
From: FoggyFinder <FoggyFinder@yandex.ua>
Date: Thu, 24 Oct 2019 13:41:46 +0300
Subject: [PATCH 2/2] add test

---
 CSharpMath.Tests/PreTypesetting/MathListTest.cs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/CSharpMath.Tests/PreTypesetting/MathListTest.cs b/CSharpMath.Tests/PreTypesetting/MathListTest.cs
index 888de673e..45d943c35 100644
--- a/CSharpMath.Tests/PreTypesetting/MathListTest.cs
+++ b/CSharpMath.Tests/PreTypesetting/MathListTest.cs
@@ -2,6 +2,7 @@
 using CSharpMath.Enumerations;
 using CSharpMath.Interfaces;
 using System;
+using System.Linq;
 using Xunit;
 
 namespace CSharpMath.Tests {
@@ -159,5 +160,19 @@ public void TestListCopy() {
       var list2 = AtomCloner.Clone(list, false);
       CheckClone(list, list2);
     }
+
+    [Fact]
+    public void TestListCopyWithFusedItems() {
+      var builder = new MathListBuilder("12+x");
+      var list = builder.Build();
+
+      var finalized = list.FinalizedList();
+      var fusedCount = finalized.Sum(atom => atom.FusedAtoms?.Count ?? 0);
+      Assert.Equal(2, fusedCount);
+
+      var copy = AtomCloner.Clone(finalized, true);
+      var fusedCopyCount = copy.Sum(atom => atom.FusedAtoms?.Count ?? 0);
+      Assert.Equal(2, fusedCopyCount);
+    }
   }
 }