Fix formatting in use-auto-prop when attributes are present (#79735)

Author: CyrusNajmabadi

src/Analyzers/CSharp/Tests/UseAutoProperty/UseAutoPropertyTests.cs

@@ -3058,4 +3058,33 @@ public C(string a)
             }
             """,
             new(options: Option(CodeStyleOptions2.QualifyPropertyAccess, true, NotificationOption2.Error)));
+
+    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/79734")]
+    public Task TestAttributeOnAccessor()
+        => TestInRegularAndScriptAsync(
+            """
+            class AAttribute : Attribute;
+
+            class C
+            {
+                [|int _i;|]
+                int I
+                {
+                    [A]
+                    get => _i;
+                }
+            }
+            """,
+            """
+            class AAttribute : Attribute;
+
+            class C
+            {
+                int I
+                {
+                    [A]
+                    get;
+                }
+            }
+            """);
 }

src/Features/CSharp/Portable/UseAutoProperty/CSharpUseAutoPropertyCodeFixProvider.cs

@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Composition;
 using System.Diagnostics.CodeAnalysis;
@@ -221,7 +220,7 @@ protected override ImmutableArray<AbstractFormattingRule> GetFormattingRules(
     {
         // If the final property is only simple `get;set;` accessors, then reformat the property to be on a single line.
         if (propertyDeclaration is PropertyDeclarationSyntax { AccessorList.Accessors: var accessors } &&
-            accessors.All(a => a is { ExpressionBody: null, Body: null }))
+            accessors.All(a => a is { ExpressionBody: null, Body: null, AttributeLists.Count: 0 }))
         {
             return [new SingleLinePropertyFormattingRule(), .. Formatter.GetDefaultFormattingRules(document)];
         }