update project diagnostics for active document immediately

Author: MattParkerDev

src/SharpIDE.Application/Features/Analysis/RoslynAnalysis.cs

@@ -301,15 +301,27 @@ public async Task UpdateSolutionDiagnostics(CancellationToken cancellationToken
 		// Performance improvements of ~15% have been observed with a large solution (100+ projects) by parallelizing this with Task.WhenAll, however it seems much heavier (14700K crashes sometimes 😅) so re-evaluate later
 		foreach (var project in _sharpIdeSolutionModel!.AllProjects)
 		{
-			var projectDiagnostics = await GetProjectDiagnostics(project, cancellationToken);
-			// TODO: only add and remove diffs
-			project.Diagnostics.RemoveRange(project.Diagnostics);
-			project.Diagnostics.AddRange(projectDiagnostics);
+			await UpdateProjectDiagnostics(project, cancellationToken);
 		}
 		timer.Stop();
 		_logger.LogInformation("RoslynAnalysis: Solution diagnostics updated in {ElapsedMilliseconds}ms", timer.ElapsedMilliseconds);
 	}
 
+	public async Task UpdateProjectDiagnostics(SharpIdeProjectModel project, CancellationToken cancellationToken = default)
+	{
+		var projectDiagnostics = await GetProjectDiagnostics(project, cancellationToken);
+		// TODO: only add and remove diffs
+		project.Diagnostics.RemoveRange(project.Diagnostics);
+		project.Diagnostics.AddRange(projectDiagnostics);
+	}
+
+	public async Task UpdateProjectDiagnosticsForFile(SharpIdeFile sharpIdeFile, CancellationToken cancellationToken = default)
+	{
+		var project = ((IChildSharpIdeNode) sharpIdeFile).GetNearestProjectNode();
+		Guard.Against.Null(project);
+		await UpdateProjectDiagnostics(project, cancellationToken);
+	}
+
 	public async Task<ImmutableArray<SharpIdeDiagnostic>> GetProjectDiagnostics(SharpIdeProjectModel projectModel, CancellationToken cancellationToken = default)
 	{
 		using var _ = SharpIdeOtel.Source.StartActivity($"{nameof(RoslynAnalysis)}.{nameof(GetProjectDiagnostics)}");

src/SharpIDE.Godot/Features/CodeEditor/SharpIdeCodeEdit.cs

@@ -104,16 +104,22 @@ private async Task OnSolutionAltered()
 		if (_fileDeleted) return;
 		GD.Print($"[{_currentFile.Name}] Solution altered, updating project diagnostics for file");
 		var newCt = _solutionAlteredCancellationTokenSeries.CreateNext();
+		var hasFocus = this.InvokeAsync(HasFocus);
 		var documentSyntaxHighlighting = _roslynAnalysis.GetDocumentSyntaxHighlighting(_currentFile, newCt);
 		var razorSyntaxHighlighting = _roslynAnalysis.GetRazorDocumentSyntaxHighlighting(_currentFile, newCt);
 		await Task.WhenAll(documentSyntaxHighlighting, razorSyntaxHighlighting).WaitAsync(newCt).ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
 		if (newCt.IsCancellationRequested) return;
 		var documentDiagnosticsTask = _roslynAnalysis.GetDocumentDiagnostics(_currentFile, newCt);
 		await this.InvokeAsync(async () => SetSyntaxHighlightingModel(await documentSyntaxHighlighting, await razorSyntaxHighlighting));
-		await ((Task)documentDiagnosticsTask).ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
+		await documentDiagnosticsTask.AsTask().ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
 		if (newCt.IsCancellationRequested) return;
 		var documentDiagnostics = await documentDiagnosticsTask;
 		await this.InvokeAsync(() => SetDiagnostics(documentDiagnostics));
+		if (await hasFocus)
+		{
+			await _roslynAnalysis.UpdateProjectDiagnosticsForFile(_currentFile, newCt).ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
+			if (newCt.IsCancellationRequested) return;
+		}
 	}
 
 	public enum LineEditOrigin

src/SharpIDE.Godot/NodeExtensions.cs

@@ -174,6 +174,11 @@ public Task InvokeDeferredAsync(Func<Task> workItem)
 
 public static class GodotTask
 {
+    extension<T>(Task<T> task)
+    {
+        public Task AsTask() => task;
+    }
+
     extension(Task task)
     {
         public static async Task GodotRun(Action action)