From 8f133b2de936a0c312c9ce84e44e507b0277c1c3 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 4 Feb 2026 09:06:57 +0000
Subject: [PATCH 1/3] Initial plan


From 262b2754aa9882df74474e6c6c15adda32dd56d4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 4 Feb 2026 09:10:38 +0000
Subject: [PATCH 2/3] Fix AttributedScopeStack.Equals logic

Co-authored-by: danipen <501613+danipen@users.noreply.github.com>
---
 .../Grammars/AttributedScopeStackTests.cs     | 35 +++++++++++++++++++
 .../Internal/Grammars/AttributedScopeStack.cs |  4 +--
 2 files changed, 37 insertions(+), 2 deletions(-)
 create mode 100644 src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs

diff --git a/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs b/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs
new file mode 100644
index 0000000..85c7453
--- /dev/null
+++ b/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs
@@ -0,0 +1,35 @@
+using NUnit.Framework;
+using TextMateSharp.Internal.Grammars;
+
+namespace TextMateSharp.Tests.Internal.Grammars
+{
+    [TestFixture]
+    internal class AttributedScopeStackTests
+    {
+        [Test]
+        public void Equals_ShouldMatchEquivalentStacks()
+        {
+            AttributedScopeStack stack1 = new AttributedScopeStack(new AttributedScopeStack(null, "source.cs", 1), "meta.test", 2);
+            AttributedScopeStack stack2 = new AttributedScopeStack(new AttributedScopeStack(null, "source.cs", 1), "meta.test", 2);
+
+            Assert.IsTrue(stack1.Equals(stack2));
+            Assert.IsTrue(stack2.Equals(stack1));
+        }
+
+        [Test]
+        public void Equals_ShouldReturnFalseForDifferentType()
+        {
+            AttributedScopeStack stack = new AttributedScopeStack(null, "source.cs", 1);
+
+            Assert.IsFalse(stack.Equals(42));
+        }
+
+        [Test]
+        public void Equals_ShouldReturnFalseForNull()
+        {
+            AttributedScopeStack stack = new AttributedScopeStack(null, "source.cs", 1);
+
+            Assert.IsFalse(stack.Equals(null));
+        }
+    }
+}
diff --git a/src/TextMateSharp/Internal/Grammars/AttributedScopeStack.cs b/src/TextMateSharp/Internal/Grammars/AttributedScopeStack.cs
index c79ffe8..70ab106 100644
--- a/src/TextMateSharp/Internal/Grammars/AttributedScopeStack.cs
+++ b/src/TextMateSharp/Internal/Grammars/AttributedScopeStack.cs
@@ -66,7 +66,7 @@ private static bool Equals(AttributedScopeStack a, AttributedScopeStack b)
 
         public override bool Equals(object other)
         {
-            if (other == null || (other is AttributedScopeStack))
+            if (other == null || !(other is AttributedScopeStack))
                 return false;
 
             return Equals(this, (AttributedScopeStack)other);
@@ -206,4 +206,4 @@ private static List<string> GenerateScopes(AttributedScopeStack scopesList)
             return result;
         }
     }
-}
\ No newline at end of file
+}

From 3574b27772a16ff5c441f387d1640f638ea57975 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 4 Feb 2026 09:11:09 +0000
Subject: [PATCH 3/3] Add negative AttributedScopeStack equality test

Co-authored-by: danipen <501613+danipen@users.noreply.github.com>
---
 .../Internal/Grammars/AttributedScopeStackTests.cs     | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs b/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs
index 85c7453..590933d 100644
--- a/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs
+++ b/src/TextMateSharp.Tests/Internal/Grammars/AttributedScopeStackTests.cs
@@ -16,6 +16,16 @@ public void Equals_ShouldMatchEquivalentStacks()
             Assert.IsTrue(stack2.Equals(stack1));
         }
 
+        [Test]
+        public void Equals_ShouldReturnFalseForDifferentStacks()
+        {
+            AttributedScopeStack stack1 = new AttributedScopeStack(new AttributedScopeStack(null, "source.cs", 1), "meta.test", 2);
+            AttributedScopeStack stack2 = new AttributedScopeStack(new AttributedScopeStack(null, "source.cs", 1), "meta.other", 2);
+
+            Assert.IsFalse(stack1.Equals(stack2));
+            Assert.IsFalse(stack2.Equals(stack1));
+        }
+
         [Test]
         public void Equals_ShouldReturnFalseForDifferentType()
         {