Use NuGet-Operation update HTTP header when using Update All button.

src/AddIns/Misc/PackageManagement/Project/Src/UpdatedPackagesViewModel.cs

@@ -84,9 +84,17 @@ namespace ICSharpCode.PackageManagement
 		
 		protected override void TryUpdatingAllPackages()
 		{
-			var factory = new UpdatePackagesActionFactory(logger, packageManagementEvents);
-			IUpdatePackagesAction action = factory.CreateAction(selectedProjects, GetPackagesFromViewModels());
-			ActionRunner.Run(action);
+			List<IPackageFromRepository> packages = GetPackagesFromViewModels().ToList();
+			using (IDisposable operation = StartUpdateOperation(packages.First())) {
+				var factory = new UpdatePackagesActionFactory(logger, packageManagementEvents);
+				IUpdatePackagesAction action = factory.CreateAction(selectedProjects, packages);
+				ActionRunner.Run(action);
+			}
+		}
+		
+		IDisposable StartUpdateOperation(IPackageFromRepository package)
+		{
+			return package.Repository.StartUpdateOperation();
 		}
 		
 		IEnumerable<IPackageFromRepository> GetPackagesFromViewModels()

src/AddIns/Misc/PackageManagement/Test/Src/UpdatedPackagesViewModelTests.cs

@@ -753,5 +753,24 @@ namespace PackageManagement.Tests
 			IPackageViewModelParent parent = childViewModel.GetParent();
 			Assert.AreEqual(viewModel, parent);
 		}
+		
+		[Test]
+		public void UpdateAllPackagesCommand_SourceRepositoryIsOperationAware_UpdateOperationStartedAndDisposed()
+		{
+			CreateViewModel();
+			var operationAwareRepository = new FakeOperationAwarePackageRepository();
+			registeredPackageRepositories.FakeActiveRepository = operationAwareRepository;
+			AddPackageToLocalRepository("Test", "1.0.0.0");
+			AddPackageToActiveRepository("Test", "1.0.0.0");
+			FakePackage newerPackage = AddPackageToActiveRepository("Test", "1.1.0.0");
+			viewModel.ReadPackages();
+			CompleteReadPackagesTask();
+			
+			RunUpdateAllPackagesCommand();
+			
+			Assert.AreEqual(RepositoryOperationNames.Update, operationAwareRepository.OperationStarted);
+			Assert.IsNull(operationAwareRepository.MainPackageIdForOperationStarted);
+			operationAwareRepository.AssertOperationIsDisposed();
+		}
 	}
 }