Fix __KnownPropertyChangedEventArgs generation

Author: Sergio0694

CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.cs

@@ -2,19 +2,19 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System.Linq;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
 using CommunityToolkit.Mvvm.SourceGenerators.ComponentModel.Models;
 using CommunityToolkit.Mvvm.SourceGenerators.Diagnostics;
 using CommunityToolkit.Mvvm.SourceGenerators.Extensions;
 using CommunityToolkit.Mvvm.SourceGenerators.Models;
-using static CommunityToolkit.Mvvm.SourceGenerators.Diagnostics.DiagnosticDescriptors;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Text;
-using System.Text;
+using static CommunityToolkit.Mvvm.SourceGenerators.Diagnostics.DiagnosticDescriptors;
 
 namespace CommunityToolkit.Mvvm.SourceGenerators;
 
@@ -126,7 +126,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
             .WithComparer(EqualityComparer<string>.Default.ForImmutableArray());
 
         // Generate the cached property changed names
-        context.RegisterSourceOutput(propertyChangingNames, static (context, item) =>
+        context.RegisterSourceOutput(propertyChangedNames, static (context, item) =>
         {
             CompilationUnitSyntax? compilationUnit = Execute.GetKnownPropertyChangedArgsSyntax(item);