HACK: eagerly load output pad because pad services cannnot be instanciated from background threads.

A proper fix would be to separate the IOutputPad implementation from the UI, so that output categories can be created and written to from background threads without waiting for the output pad UI to be created.

Author: dgrunwald

src/Main/Core/Project/Src/AddInTree/AddIn/DefaultDoozers/ServiceDoozer.cs

@@ -37,6 +37,7 @@ public object BuildItem(BuildItemArgs args)
 				// Use ServiceCreatorCallback to lazily create the service
 				container.AddService(
 					interfaceType, delegate {
+						// This callback runs within the service container's lock
 						if (serviceLoading)
 							throw new InvalidOperationException("Found cyclic dependency when initializating " + className);
 						serviceLoading = true;

src/Main/SharpDevelop/Workbench/WorkbenchStartup.cs

@@ -47,6 +47,7 @@ static void InitializeWorkbench(WpfWorkbench workbench, IWorkbenchLayout layout)
 
 			UILanguageService.ValidateLanguage();
 
+			SD.GetService<IOutputPad>(); // HACK: eagerly load output pad because pad services cannnot be instanciated from background threads
 			TaskService.Initialize();
 			Project.CustomToolsService.Initialize();