Update 'hide base' fixer to use modern fix all pattern.

src/Analyzers/CSharp/CodeFixes/HideBase/HideBaseCodeFixProvider.AddNewKeywordAction.cs

@@ -2,64 +2,53 @@
 // 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.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.CodeAnalysis.CodeActions;
 using Microsoft.CodeAnalysis.CSharp.CodeStyle;
 using Microsoft.CodeAnalysis.CSharp.LanguageService;
 using Microsoft.CodeAnalysis.CSharp.OrderModifiers;
 using Microsoft.CodeAnalysis.Options;
 using Microsoft.CodeAnalysis.OrderModifiers;
 using Microsoft.CodeAnalysis.Shared.Extensions;
-using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.CSharp.CodeFixes.HideBase;
 
 using static CSharpSyntaxTokens;
 
 internal sealed partial class HideBaseCodeFixProvider
 {
-    private sealed class AddNewKeywordAction(Document document, SyntaxNode node) : CodeAction
+    private static async Task<Document> GetChangedDocumentAsync(
+        Document document, SyntaxNode node, CancellationToken cancellationToken)
     {
-        private readonly Document _document = document;
-        private readonly SyntaxNode _node = node;
+        var root = await document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
+        var modifierOrder = await GetModifierOrderAsync(document, cancellationToken).ConfigureAwait(false);
 
-        public override string Title => CSharpCodeFixesResources.Hide_base_member;
-
-        protected override async Task<Document> GetChangedDocumentAsync(CancellationToken cancellationToken)
-        {
-            var root = await _document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
-            var configOptions = await _document.GetHostAnalyzerConfigOptionsAsync(cancellationToken).ConfigureAwait(false);
-
-            var newNode = GetNewNode(_node, configOptions.GetOption(CSharpCodeStyleOptions.PreferredModifierOrder).Value);
-            var newRoot = root.ReplaceNode(_node, newNode);
+        return document.WithSyntaxRoot(root.ReplaceNode(node, GetNewNode(node, modifierOrder)));
+    }
 
-            return _document.WithSyntaxRoot(newRoot);
-        }
+    private static SyntaxNode GetNewNode(SyntaxNode node, Dictionary<int, int>? preferredOrder)
+    {
+        var syntaxFacts = CSharpSyntaxFacts.Instance;
+        var modifiers = syntaxFacts.GetModifiers(node);
+        var newModifiers = modifiers.Add(NewKeyword);
 
-        private static SyntaxNode GetNewNode(SyntaxNode node, string preferredModifierOrder)
+        if (preferredOrder is null ||
+            !AbstractOrderModifiersHelpers.IsOrdered(preferredOrder, modifiers))
         {
-            var syntaxFacts = CSharpSyntaxFacts.Instance;
-            var modifiers = syntaxFacts.GetModifiers(node);
-            var newModifiers = modifiers.Add(NewKeyword);
-
-            if (!CSharpOrderModifiersHelper.Instance.TryGetOrComputePreferredOrder(preferredModifierOrder, out var preferredOrder) ||
-                !AbstractOrderModifiersHelpers.IsOrdered(preferredOrder, modifiers))
-            {
-                return syntaxFacts.WithModifiers(node, newModifiers);
-            }
+            return syntaxFacts.WithModifiers(node, newModifiers);
+        }
 
-            var orderedModifiers = new SyntaxTokenList(
-                newModifiers.OrderBy(CompareModifiers));
+        var orderedModifiers = new SyntaxTokenList(
+            newModifiers.OrderBy(CompareModifiers));
 
-            return syntaxFacts.WithModifiers(node, orderedModifiers);
+        return syntaxFacts.WithModifiers(node, orderedModifiers);
 
-            int CompareModifiers(SyntaxToken left, SyntaxToken right)
-                => GetOrder(left) - GetOrder(right);
+        int CompareModifiers(SyntaxToken left, SyntaxToken right)
+            => GetOrder(left) - GetOrder(right);
 
-            int GetOrder(SyntaxToken token)
-                => preferredOrder.TryGetValue(token.RawKind, out var value) ? value : int.MaxValue;
-        }
+        int GetOrder(SyntaxToken token)
+            => preferredOrder.TryGetValue(token.RawKind, out var value) ? value : int.MaxValue;
     }
 }

src/Analyzers/CSharp/CodeFixes/HideBase/HideBaseCodeFixProvider.cs

@@ -2,45 +2,81 @@
 // 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.Collections.Generic;
 using System.Collections.Immutable;
 using System.Composition;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.CodeActions;
 using Microsoft.CodeAnalysis.CodeFixes;
+using Microsoft.CodeAnalysis.CSharp.CodeStyle;
+using Microsoft.CodeAnalysis.CSharp.OrderModifiers;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Editing;
+using Microsoft.CodeAnalysis.Options;
 using Microsoft.CodeAnalysis.Shared.Extensions;
 
 namespace Microsoft.CodeAnalysis.CSharp.CodeFixes.HideBase;
 
 [ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.AddNew), Shared]
 [method: ImportingConstructor]
 [method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
-internal sealed partial class HideBaseCodeFixProvider() : CodeFixProvider
+internal sealed partial class HideBaseCodeFixProvider() : SyntaxEditorBasedCodeFixProvider
 {
     internal const string CS0108 = nameof(CS0108); // 'SomeClass.SomeMember' hides inherited member 'SomeClass.SomeMember'. Use the new keyword if hiding was intended.
 
     public override ImmutableArray<string> FixableDiagnosticIds => [CS0108];
 
-    public override FixAllProvider GetFixAllProvider()
-        => WellKnownFixAllProviders.BatchFixer;
-
-    public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
+    private static SyntaxNode? GetOriginalNode(SyntaxNode root, Diagnostic diagnostic)
     {
-        var root = await context.Document.GetRequiredSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
-
-        var diagnostic = context.Diagnostics.First();
         var diagnosticSpan = diagnostic.Location.SourceSpan;
-
         var token = root.FindToken(diagnosticSpan.Start);
 
         var originalNode = token.GetAncestor<PropertyDeclarationSyntax>() ??
             token.GetAncestor<MethodDeclarationSyntax>() ??
             (SyntaxNode?)token.GetAncestor<FieldDeclarationSyntax>();
+        return originalNode;
+    }
+
+    public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
+    {
+        var root = await context.Document.GetRequiredSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
 
+        var originalNode = GetOriginalNode(root, context.Diagnostics.First());
         if (originalNode == null)
             return;
 
-        context.RegisterCodeFix(new AddNewKeywordAction(context.Document, originalNode), context.Diagnostics);
+        context.RegisterCodeFix(CodeAction.Create(
+            CSharpCodeFixesResources.Hide_base_member,
+            cancellationToken => GetChangedDocumentAsync(context.Document, originalNode, cancellationToken),
+            nameof(CSharpCodeFixesResources.Hide_base_member)),
+            context.Diagnostics);
+    }
+
+    protected override async Task FixAllAsync(
+        Document document, ImmutableArray<Diagnostic> diagnostics, SyntaxEditor editor, CancellationToken cancellationToken)
+    {
+        var modifierOrder = await GetModifierOrderAsync(document, cancellationToken).ConfigureAwait(false);
+
+        var root = editor.OriginalRoot;
+        foreach (var diagnostic in diagnostics)
+        {
+            var originalNode = GetOriginalNode(root, diagnostic);
+            if (originalNode == null)
+                continue;
+
+            var newNode = GetNewNode(originalNode, modifierOrder);
+            editor.ReplaceNode(originalNode, newNode);
+        }
+    }
+
+    private static async Task<Dictionary<int, int>?> GetModifierOrderAsync(Document document, CancellationToken cancellationToken)
+    {
+        var configOptions = await document.GetHostAnalyzerConfigOptionsAsync(cancellationToken).ConfigureAwait(false);
+        var modifierOrder = configOptions.GetOption(CSharpCodeStyleOptions.PreferredModifierOrder).Value;
+        CSharpOrderModifiersHelper.Instance.TryGetOrComputePreferredOrder(modifierOrder, out var preferredOrder);
+        return preferredOrder;
     }
 }