Fix #33560 Handle equal tokens where Text is not available.

src/Workspaces/CSharp/Portable/Utilities/FormattingRangeHelper.cs

@@ -288,6 +288,8 @@ private static SyntaxToken GetPreviousTokenIfNotFirstTokenInTree(SyntaxToken tok
 
         public static bool AreTwoTokensOnSameLine(SyntaxToken token1, SyntaxToken token2)
         {
+            if (token1 == token2) return true;
+
             var tree = token1.SyntaxTree;
             if (tree != null && tree.TryGetText(out var text))
             {

src/Workspaces/CoreTest/UtilityTest/FormattingRangeHelperTests.cs

+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Utilities;
+using Xunit;
+
+namespace Microsoft.CodeAnalysis.UnitTests.UtilityTest
+{
+    public class FormattingRangeHelperTests
+    {
+        [Fact]
+        public void TestAreTwoTokensOnSameLineTrue()
+        {
+            var root = SyntaxFactory.ParseSyntaxTree("{Foo();}").GetRoot();
+            var token1 = root.GetFirstToken();
+            var token2 = root.GetLastToken();
+
+            Assert.True(FormattingRangeHelper.AreTwoTokensOnSameLine(token1, token2));
+        }
+
+        [Fact]
+        public void TestAreTwoTokensOnSameLineFalse()
+        {
+            var root = SyntaxFactory.ParseSyntaxTree("{Fizz();\nBuzz();}").GetRoot();
+            var token1 = root.GetFirstToken();
+            var token2 = root.GetLastToken();
+
+            Assert.False(FormattingRangeHelper.AreTwoTokensOnSameLine(token1, token2));
+        }
+
+        [Fact]
+        public void TestAreTwoTokensOnSameLineWithEqualTokens()
+        {
+            var token = SyntaxFactory.ParseSyntaxTree("else\nFoo();").GetRoot().GetFirstToken();
+
+            Assert.True(FormattingRangeHelper.AreTwoTokensOnSameLine(token, token));
+        }
+
+        [Fact]
+        public void TestAreTwoTokensOnSameLineWithEqualTokensWithoutSyntaxTree()
+        {
+            var token = SyntaxFactory.ParseToken("else");
+
+            Assert.True(FormattingRangeHelper.AreTwoTokensOnSameLine(token, token));
+        }
+    }
+}