Do not suggest 'nullable' keyword in pragma directive

Author: DoctorKrolic

src/EditorFeatures/CSharpTest2/Recommendations/NullableKeywordRecommenderTests.cs

@@ -2,10 +2,9 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#nullable disable
-
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Test.Utilities;
+using Roslyn.Test.Utilities;
 using Xunit;
 
 namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations
@@ -95,19 +94,22 @@ public async Task TestNotAfterPragmaWarning()
             => await VerifyAbsenceAsync(@"#pragma warning $$");
 
         [Fact]
-        public async Task TestAfterPragmaWarningDisable()
-            => await VerifyKeywordAsync(@"#pragma warning disable $$");
+        [WorkItem(63594, "https://github.com/dotnet/roslyn/issues/63594")]
+        public async Task TestNotAfterPragmaWarningDisable()
+            => await VerifyAbsenceAsync(@"#pragma warning disable $$");
 
         [Fact]
-        public async Task TestAfterPragmaWarningEnable()
-            => await VerifyKeywordAsync(@"#pragma warning enable $$");
+        [WorkItem(63594, "https://github.com/dotnet/roslyn/issues/63594")]
+        public async Task TestNotAfterPragmaWarningEnable()
+            => await VerifyAbsenceAsync(@"#pragma warning enable $$");
 
         [Fact]
-        public async Task TestAfterPragmaWarningRestore()
-            => await VerifyKeywordAsync(@"#pragma warning restore $$");
+        [WorkItem(63594, "https://github.com/dotnet/roslyn/issues/63594")]
+        public async Task TestNotAfterPragmaWarningRestore()
+            => await VerifyAbsenceAsync(@"#pragma warning restore $$");
 
         [Fact]
-        public async Task TestAfterPragmaWarningSafeOnly()
+        public async Task TestNotAfterPragmaWarningSafeOnly()
             => await VerifyAbsenceAsync(@"#pragma warning safeonly $$");
 
         [Fact]

src/Features/CSharp/Portable/Completion/KeywordRecommenders/NullableKeywordRecommender.cs

@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#nullable disable
-
 using System.Threading;
 using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
 
@@ -17,25 +15,6 @@ public NullableKeywordRecommender()
         }
 
         protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
-        {
-            // #nullable
-            if (context.IsPreProcessorKeywordContext)
-            {
-                return true;
-            }
-
-            var previousToken1 = context.TargetToken;
-            var previousToken2 = previousToken1.GetPreviousToken(includeSkipped: true);
-            var previousToken3 = previousToken2.GetPreviousToken(includeSkipped: true);
-            var previousToken4 = previousToken3.GetPreviousToken(includeSkipped: true);
-
-            return
-               // # pragma warning <action> |
-               (previousToken1.Kind() == SyntaxKind.DisableKeyword || previousToken1.Kind() == SyntaxKind.RestoreKeyword ||
-                previousToken1.Kind() == SyntaxKind.EnableKeyword) &&
-               previousToken2.Kind() == SyntaxKind.WarningKeyword &&
-               previousToken3.Kind() == SyntaxKind.PragmaKeyword &&
-               previousToken4.Kind() == SyntaxKind.HashToken;
-        }
+            => context.IsPreProcessorKeywordContext;
     }
 }