Merge pull request #24614 from chborl/failedbuildcommandline

Fix command line build error

src/EditorFeatures/Core/Shared/Utilities/ForegroundThreadAffinitizedObject.cs

@@ -32,7 +32,7 @@ internal static ForegroundThreadData CreateDefault(ForegroundThreadDataKind defa
         {
             var kind = ForegroundThreadDataInfo.CreateDefault(defaultKind);
 
-            return new ForegroundThreadData(Thread.CurrentThread, new SynchronizationContextTaskScheduler(SynchronizationContext.Current), kind);
+            return new ForegroundThreadData(Thread.CurrentThread, SynchronizationContext.Current == null ? TaskScheduler.Default : new SynchronizationContextTaskScheduler(SynchronizationContext.Current), kind);
         }
     }
 

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

@@ -38,7 +38,7 @@ static void Main(string[] args)
             // TODO: Validate build works as expected
         }
 
-        [Fact(Skip = "https://github.com/dotnet/roslyn/issues/18299"), Trait(Traits.Feature, Traits.Features.Build)]
+        [Fact, Trait(Traits.Feature, Traits.Features.Build)]
         public void BuildWithCommandLine()
         {
             VisualStudio.SolutionExplorer.SaveAll();