Delay the Misc Files warning toast.

src/lsptoolshost/languageStatusBar.ts

@@ -29,10 +29,7 @@ function combineDocumentSelectors(...selectors: vscode.DocumentSelector[]): vsco
 
 class WorkspaceStatus {
     static createStatusItem(context: vscode.ExtensionContext, languageServerEvents: RoslynLanguageServerEvents) {
-        const documentSelector = combineDocumentSelectors(
-            languageServerOptions.documentSelector,
-            RazorLanguage.documentSelector
-        );
+        const documentSelector = combineDocumentSelectors(languageServerOptions.documentSelector);
         const openSolutionCommand = {
             command: 'dotnet.openSolution',
             title: vscode.l10n.t('Open solution'),
@@ -79,9 +76,10 @@ class ProjectContextStatus {
             // Show a warning when the active file is part of the Miscellaneous File workspace and
             // project initialization is complete.
             if (languageServer.state === ServerState.ProjectInitializationComplete) {
-                item.severity = e.context._vs_is_miscellaneous
-                    ? vscode.LanguageStatusSeverity.Warning
-                    : vscode.LanguageStatusSeverity.Information;
+                item.severity =
+                    e.context._vs_is_miscellaneous && e.isVerified
+                        ? vscode.LanguageStatusSeverity.Warning
+                        : vscode.LanguageStatusSeverity.Information;
             } else {
                 item.severity = vscode.LanguageStatusSeverity.Information;
             }

src/lsptoolshost/miscellaneousFileNotifier.ts

@@ -21,6 +21,7 @@ export function registerMiscellaneousFileNotifier(
         // Only warn for C# miscellaneous files when the workspace is fully initialized.
         if (
             e.languageId !== 'csharp' ||
+            !e.isVerified ||
             !e.context._vs_is_miscellaneous ||
             languageServer.state !== ServerState.ProjectInitializationComplete
         ) {
@@ -39,10 +40,10 @@ export function registerMiscellaneousFileNotifier(
         const hash = createHash(e.uri.toString(/*skipEncoding:*/ true));
         if (NotifiedDocuments.has(hash)) {
             return;
-        } else {
-            NotifiedDocuments.add(hash);
         }
 
+        NotifiedDocuments.add(hash);
+
         const message = vscode.l10n.t(
             'The active document is not part of the open workspace. Not all language features will be available.'
         );

src/lsptoolshost/services/projectContextService.ts

@@ -15,8 +15,14 @@ export interface ProjectContextChangeEvent {
     languageId: string;
     uri: vscode.Uri;
     context: VSProjectContext;
+    isVerified: boolean;
 }
 
+const VerificationDelay = 2 * 1000;
+
+let _verifyTimeout: NodeJS.Timeout | undefined;
+let _documentUriToVerify: vscode.Uri | undefined;
+
 export class ProjectContextService {
     private readonly _contextChangeEmitter = new vscode.EventEmitter<ProjectContextChangeEvent>();
     private _source = new vscode.CancellationTokenSource();
@@ -47,7 +53,7 @@ export class ProjectContextService {
     public async refresh() {
         const textEditor = vscode.window.activeTextEditor;
         const languageId = textEditor?.document?.languageId;
-        if (languageId !== 'csharp' && languageId !== 'aspnetcorerazor') {
+        if (languageId !== 'csharp') {
             return;
         }
 
@@ -57,19 +63,55 @@ export class ProjectContextService {
 
         const uri = textEditor!.document.uri;
 
+        // Whether we have refreshed the active document's project context.
+        let isVerifyPass = false;
+
+        if (_verifyTimeout) {
+            // If we have changed active document then do not verify the previous one.
+            clearTimeout(_verifyTimeout);
+            _verifyTimeout = undefined;
+        }
+
+        if (_documentUriToVerify) {
+            if (uri.toString() === _documentUriToVerify.toString()) {
+                // We have rerequested project contexts for the active document
+                // and we can now notify if the document isn't part of the workspace.
+                isVerifyPass = true;
+            }
+
+            _documentUriToVerify = undefined;
+        }
+
         if (!this._languageServer.isRunning()) {
-            this._contextChangeEmitter.fire({ languageId, uri, context: this._emptyProjectContext });
+            this._contextChangeEmitter.fire({ languageId, uri, context: this._emptyProjectContext, isVerified: false });
             return;
         }
 
         const contextList = await this.getProjectContexts(uri, this._source.token);
         if (!contextList) {
-            this._contextChangeEmitter.fire({ languageId, uri, context: this._emptyProjectContext });
+            this._contextChangeEmitter.fire({ languageId, uri, context: this._emptyProjectContext, isVerified: false });
             return;
         }
 
         const context = contextList._vs_projectContexts[contextList._vs_defaultIndex];
-        this._contextChangeEmitter.fire({ languageId, uri, context });
+        const isVerified = !context._vs_is_miscellaneous || isVerifyPass;
+        this._contextChangeEmitter.fire({ languageId, uri, context, isVerified });
+
+        if (context._vs_is_miscellaneous && !isVerifyPass) {
+            // Request the active project context be refreshed but delay the request to give
+            // time for the project system to update with new files.
+            _verifyTimeout = setTimeout(() => {
+                _verifyTimeout = undefined;
+                _documentUriToVerify = uri;
+
+                // Trigger a refresh, but don't block on refresh completing.
+                this.refresh().catch((e) => {
+                    throw new Error(`Error refreshing project context status ${e}`);
+                });
+            }, VerificationDelay);
+
+            return;
+        }
     }
 
     private async getProjectContexts(