Stop capturing platform tool error output after startup

src/Particular.PlatformSample/AppLauncher.cs

@@ -16,9 +16,13 @@ sealed class AppLauncher(bool showPlatformToolConsoleOutput) : IAsyncDisposable
         readonly bool hideConsoleOutput = !showPlatformToolConsoleOutput;
         readonly Stack<Func<ValueTask>> cleanupActions = new();
         readonly List<PlatformTool> platformTools = [];
+        volatile bool captureErrorOutput = true;
 
         public sealed record PlatformTool(string Name, Process Process, StringBuilder ErrorOutput);
 
+        // The error output is only needed to report a startup failure, so stop keeping it once startup succeeds
+        public void StopCapturingErrorOutput() => captureErrorOutput = false;
+
         public void StopProcesses()
         {
             foreach (var tool in platformTools)
@@ -220,10 +224,11 @@ void StartProcess(string name, string assemblyPath, Dictionary<string, string> e
             // without this in certain occasions the start takes waaaaay longer!
             if (hideConsoleOutput)
             {
-                // Keep the hidden error output so it can be shown if the tool fails to start
+                // Keep the hidden error output so it can be shown if the tool fails to start.
+                // The stream is still read after capturing stops, otherwise the tool blocks once the pipe buffer is full.
                 process.ErrorDataReceived += (_, args) =>
                 {
-                    if (args.Data is not null)
+                    if (args.Data is not null && captureErrorOutput)
                     {
                         tool.ErrorOutput.AppendLine(args.Data);
                     }

src/Particular.PlatformSample/PlatformLauncher.cs

@@ -131,6 +131,8 @@ await Network.WaitForHttpOk($"http://localhost:{controlPort}/api", stopWaiting:
                 return;
             }
 
+            launcher.StopCapturingErrorOutput();
+
             if (!tokenSource.IsCancellationRequested)
             {
                 var serviceControlApiUrl = $"http://localhost:{controlPort}/api";