Merge pull request #14631 from heejaechang/fixNullException

fixed 2 issue where IDE analyzer throws null exception and host analy…

src/Features/Core/Portable/Diagnostics/AbstractHostDiagnosticUpdateSource.cs

@@ -105,6 +105,14 @@ public void ClearAnalyzerDiagnostics(ImmutableArray<DiagnosticAnalyzer> analyzer
             }
         }
 
+        public void ClearAnalyzerDiagnostics(ProjectId projectId)
+        {
+            foreach (var analyzer in _analyzerHostDiagnosticsMap.Keys)
+            {
+                ClearAnalyzerDiagnostics(analyzer, projectId);
+            }
+        }
+
         private void ClearAnalyzerDiagnostics(DiagnosticAnalyzer analyzer, ProjectId projectId)
         {
             ImmutableHashSet<DiagnosticData> existing;

src/VisualStudio/Core/Def/Implementation/TaskList/HostDiagnosticUpdateSource.cs

@@ -98,6 +98,8 @@ public void ClearAllDiagnosticsForProject(ProjectId projectId)
                     RaiseDiagnosticsRemovedForProject(projectId, key);
                 }
             }
+
+            ClearAnalyzerDiagnostics(projectId);
         }
 
         public void ClearDiagnosticsForProject(ProjectId projectId, object key)

src/Workspaces/Remote/Core/Diagnostics/DiagnosticComputer.cs

@@ -59,7 +59,7 @@ public DiagnosticComputer(Project project)
             // TODO: can we support analyzerExceptionFilter in remote host? 
             //       right now, host doesn't support watson, we might try to use new NonFatal watson API?
             var analyzerOptions = new CompilationWithAnalyzersOptions(
-                    options: _project.AnalyzerOptions,
+                    options: new WorkspaceAnalyzerOptions(_project.AnalyzerOptions, _project.Solution.Workspace),
                     onAnalyzerException: OnAnalyzerException,
                     analyzerExceptionFilter: null,
                     concurrentAnalysis: true,