Merge pull request #57212 from CyrusNajmabadi/addUsingIncompleteMember

Ensure that async add-using works with incomplete members

Author: CyrusNajmabadi

src/Features/Core/Portable/Diagnostics/Analyzers/UnboundIdentifiersDiagnosticAnalyzerBase.cs

@@ -33,7 +33,9 @@ internal abstract class UnboundIdentifiersDiagnosticAnalyzerBase<TLanguageKindEn
         protected abstract ImmutableArray<TLanguageKindEnum> SyntaxKindsOfInterest { get; }
         protected abstract bool IsNameOf(SyntaxNode node);
 
-        public CodeActionRequestPriority RequestPriority => CodeActionRequestPriority.Normal;
+        // High priority as we need to know about unbound identifiers so that we can run add-using to fix them.
+        public CodeActionRequestPriority RequestPriority
+            => CodeActionRequestPriority.High;
 
         public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics
             => ImmutableArray.Create(DiagnosticDescriptor);

src/VisualStudio/IntegrationTest/IntegrationTests/CSharp/CSharpCodeActions.cs

@@ -69,6 +69,21 @@ internal void Bar()
 ");
         }
 
+        [WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsAddImport)]
+        public void AddUsingOnIncompleteMember()
+        {
+            // Need to ensure that incomplete member diagnostics run at high pri so that add-using can be
+            // triggered by them.
+            SetUpEditor(@"
+class Program
+{
+    DateTime$$
+}
+");
+            VisualStudio.Editor.InvokeCodeActionList();
+            VisualStudio.Editor.Verify.CodeAction("using System;");
+        }
+
         [WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsAddImport)]
         public void FastDoubleInvoke()
         {