fix api

Author: DedSec256

ReSharper.FSharp/src/FSharp.Common/src/Checker/FcsCheckerService.fs

@@ -148,18 +148,22 @@ type FcsCheckerService(lifetime: Lifetime, logger: ILogger, onSolutionCloseNotif
         if checker.IsValueCreated then
             checker.Value.InvalidateConfiguration(fcsProjectOptions, false)
 
+    member private x.InvalidateFcsProjectInternal(project: IProject) =
+        project.GetPsiModules()
+        |> Seq.choose x.FcsProjectProvider.GetProjectOptions
+        |> Seq.iter x.InvalidateFcsProject
+
     member x.InvalidateFcsProject(project: IProject) =
         if checker.IsValueCreated then
-            project.GetPsiModules()
-            |> Seq.choose x.FcsProjectProvider.GetProjectOptions
-            |> Seq.iter x.InvalidateFcsProject
+            use lock = ReadLockCookie.Create()
+            x.InvalidateFcsProjectInternal(project)
 
     member x.InvalidateFcsProjects(solution: ISolution, isApplicable: IProject -> bool) =
-        use lock = ReadLockCookie.Create()
         if checker.IsValueCreated then
+            use lock = ReadLockCookie.Create()
             solution.GetAllProjects()
             |> Seq.filter isApplicable
-            |> Seq.iter x.InvalidateFcsProject
+            |> Seq.iter x.InvalidateFcsProjectInternal
 
     /// Use with care: returns wrong symbol inside its non-recursive declaration, see dotnet/fsharp#7694.
     member x.ResolveNameAtLocation(sourceFile: IPsiSourceFile, names, coords, opName) =