Remove imports should only format the section of the document that wa…

…s touched (#76038)

SpellingExclusions.dic

@@ -2,3 +2,4 @@
 awaitable
 Refactorings
 Infos
+cref

src/Analyzers/CSharp/Tests/RemoveUnnecessaryImports/RemoveUnnecessaryImportsTests.cs

@@ -19,8 +19,10 @@ namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.RemoveUnnecessaryImport
     CSharpRemoveUnnecessaryImportsCodeFixProvider>;
 
 [Trait(Traits.Feature, Traits.Features.CodeActionsRemoveUnnecessaryImports)]
-public class RemoveUnnecessaryImportsTests
+public sealed class RemoveUnnecessaryImportsTests
 {
+    private static readonly string s_tab = "\t";
+
     [Fact]
     public async Task TestNoReferences()
     {
@@ -2246,4 +2248,36 @@ static void Main(string[] args)
             """
         }.RunAsync();
     }
+
+    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/65114")]
+    public async Task DoNotTouchInnerNamespaceWithoutUsings()
+    {
+        await VerifyCS.VerifyCodeFixAsync(
+            $$"""
+            [|{|IDE0005:using System;
+            using System.Collections.Generic;
+            using System.Linq;|}|]
+
+            namespace N
+            {
+            {{s_tab}}class Program
+                {
+                    static void Main(string[] args)
+                    {
+                    }
+                }
+            }
+            """,
+            $$"""
+            namespace N
+            {
+            {{s_tab}}class Program
+                {
+                    static void Main(string[] args)
+                    {
+                    }
+                }
+            }
+            """);
+    }
 }

src/Analyzers/Core/CodeFixes/RemoveUnnecessaryImports/AbstractRemoveUnnecessaryImportsCodeFixProvider.cs

@@ -2,13 +2,11 @@
 // 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;
 using System.Collections.Immutable;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.CodeActions;
 using Microsoft.CodeAnalysis.CodeFixes;
-using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Formatting;
 using Microsoft.CodeAnalysis.Shared.Extensions;
 
@@ -30,19 +28,19 @@ public sealed override Task RegisterCodeFixesAsync(CodeFixContext context)
         context.RegisterCodeFix(
             CodeAction.Create(
                 title,
-                c => RemoveUnnecessaryImportsAsync(context.Document, c),
+                cancellationToken => RemoveUnnecessaryImportsAsync(context.Document, cancellationToken),
                 title),
             context.Diagnostics);
         return Task.CompletedTask;
     }
 
     protected abstract string GetTitle();
 
-    private static async Task<Document> RemoveUnnecessaryImportsAsync(
+    private static Task<Document> RemoveUnnecessaryImportsAsync(
         Document document,
         CancellationToken cancellationToken)
     {
         var service = document.GetRequiredLanguageService<IRemoveUnnecessaryImportsService>();
-        return await service.RemoveUnnecessaryImportsAsync(document, cancellationToken).ConfigureAwait(false);
+        return service.RemoveUnnecessaryImportsAsync(document, cancellationToken);
     }
 }