Update TopSyntaxComparer for top-level statements

src/EditorFeatures/CSharpTest/EditAndContinue/StatementEditingTests.cs

@@ -9766,7 +9766,7 @@ public void TupleType_LocalVariables()
                 "Update [y = (3, 4)]@56 -> [y2 = (3, 4)]@96");
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/44423")]
+        [Fact]
         [WorkItem(44423, "https://github.com/dotnet/roslyn/issues/44423")]
         public void TupleElementName()
         {

src/Features/CSharp/Portable/EditAndContinue/TopSyntaxComparer.cs

@@ -106,6 +106,7 @@ internal enum Label
             IndexerDeclaration,                // tied to parent
             EventDeclaration,                  // tied to parent
             EnumMemberDeclaration,             // tied to parent
+            GlobalStatement,                   // tied to parent
 
             AccessorList,                      // tied to parent
             AccessorDeclaration,               // tied to parent
@@ -145,6 +146,7 @@ private static int TiedToAncestor(Label label)
                 case Label.IndexerDeclaration:
                 case Label.EventDeclaration:
                 case Label.EnumMemberDeclaration:
+                case Label.GlobalStatement:
                 case Label.AccessorDeclaration:
                 case Label.AccessorList:
                 case Label.TypeParameterList:
@@ -172,9 +174,8 @@ internal static Label Classify(SyntaxKind kind, out bool isLeaf)
                     return Label.CompilationUnit;
 
                 case SyntaxKind.GlobalStatement:
-                    // TODO:
-                    isLeaf = true;
-                    return Label.Ignored;
+                    isLeaf = false;
+                    return Label.GlobalStatement;
 
                 case SyntaxKind.ExternAliasDirective:
                     isLeaf = true;
@@ -339,6 +340,7 @@ public override bool ValuesEqual(SyntaxNode left, SyntaxNode right)
                 case SyntaxKind.SetAccessorDeclaration:
                 case SyntaxKind.AddAccessorDeclaration:
                 case SyntaxKind.RemoveAccessorDeclaration:
+                case SyntaxKind.GlobalStatement:
                     // When comparing method bodies we need to NOT ignore VariableDeclaration and VariableDeclarator children,
                     // but when comparing field definitions we should ignore VariableDeclarations children.
 
@@ -375,6 +377,7 @@ private static SyntaxNode GetBody(SyntaxNode node)
             {
                 case BaseMethodDeclarationSyntax baseMethodDeclarationSyntax: return baseMethodDeclarationSyntax.Body ?? (SyntaxNode)baseMethodDeclarationSyntax.ExpressionBody?.Expression;
                 case AccessorDeclarationSyntax accessorDeclarationSyntax: return accessorDeclarationSyntax.Body ?? (SyntaxNode)accessorDeclarationSyntax.ExpressionBody?.Expression;
+                case GlobalStatementSyntax globalStatement: return globalStatement.Statement;
                 default: throw ExceptionUtilities.UnexpectedValue(node);
             }
         }