Prioritize designer scanning for the current file.

src/VisualStudio/Core/Def/Implementation/DesignerAttribute/VisualStudioDesignerAttributeService.cs

@@ -108,7 +108,7 @@ private async Task StartAsync(CancellationToken cancellationToken)
         private async Task StartWorkerAsync(CancellationToken cancellationToken)
         {
             _workQueue = new AsyncBatchingWorkQueue<DesignerAttributeData>(
-                TimeSpan.FromSeconds(1),
+                TimeSpan.FromMilliseconds(500),
                 this.NotifyProjectSystemAsync,
                 cancellationToken);
 

src/Workspaces/Remote/ServiceHub/Services/DesignerAttribute/RemoteDesignerAttributeService.cs

@@ -33,7 +33,7 @@ public Task StartScanningForDesignerAttributesAsync(CancellationToken cancellati
                     analyzerProvider,
                     new IncrementalAnalyzerProviderMetadata(
                         nameof(RemoteDesignerAttributeIncrementalAnalyzerProvider),
-                        highPriorityForActiveFile: false,
+                        highPriorityForActiveFile: true,
                         workspaceKinds: WorkspaceKind.RemoteWorkspace));
 
                 return Task.CompletedTask;