Request latest package versions from NuGet feed.

Use $filter=IsLatestVersion when requesting packages from the online NuGet feed. Reduces the number of requests sent and the results are displayed quicker.

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

@@ -38,7 +38,12 @@ namespace ICSharpCode.PackageManagement
 			if (repository == null) {
 				throw new ApplicationException(errorMessage);
 			}
-			return repository.GetPackages();
+			return repository.GetPackages().Where(package => package.IsLatestVersion);
+		}
+		
+		public IQueryable<IPackage> CallGetPackagesFromPackageSource()
+		{
+			return GetPackagesFromPackageSource();
 		}
 		
 		/// <summary>

src/AddIns/Misc/PackageManagement/Project/Src/Design/FakePackage.cs

@@ -37,6 +37,7 @@ namespace ICSharpCode.PackageManagement.Design
 			this.Description = String.Empty;
 			this.Version = new SemanticVersion(version);
 			this.Listed = true;
+			this.IsLatestVersion = true;
 		}
 		
 		public static FakePackage CreatePackageWithVersion(string version)

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

@@ -164,15 +164,23 @@ namespace ICSharpCode.PackageManagement
 		IEnumerable<IPackage> GetFilteredPackagesBeforePagingResults()
 		{
 			if (allPackages == null) {
-				IQueryable<IPackage> packages = GetAllPackages();
+				IQueryable<IPackage> packages = GetPackagesFromPackageSource();
-				packages = OrderPackages(packages);
-				packages = FilterPackagesBySearchCriteria(packages);
 				TotalItems = packages.Count();
 				allPackages = GetFilteredPackagesBeforePagingResults(packages);
 			}
 			return allPackages;
 		}
 		
+		/// <summary>
+		/// Returns the queryable object that will be used to query the NuGet online feed.
+		/// </summary>
+		public IQueryable<IPackage> GetPackagesFromPackageSource()
+		{
+			IQueryable<IPackage> packages = GetAllPackages();
+			packages = OrderPackages(packages);
+			return FilterPackagesBySearchCriteria(packages);
+		}
+		
 		protected virtual IQueryable<IPackage> OrderPackages(IQueryable<IPackage> packages)
 		{
 			return packages

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

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.Design;
 using NuGet;
@@ -364,7 +365,7 @@ namespace PackageManagement.Tests
 		{
 			CreateViewModel();
 			
-			var releasePackage = new FakePackage("Test", "1.0.0.0");
+			var releasePackage = new FakePackage("Test", "1.1.0.0");
 			var prereleasePackage = new FakePackage("Test", "1.1.0-alpha");
 			
 			var packages = new FakePackage[] {
@@ -406,5 +407,27 @@ namespace PackageManagement.Tests
 			
 			PackageCollectionAssert.AreEqual(expectedPackages, viewModel.PackageViewModels);
 		}
+		
+		
+		[Test]
+		public void GetPackagesFromPackageSource_RepositoryHasThreePackagesWithSameIdButDifferentVersions_LatestPackageVersionOnlyRequestedFromPackageSource()
+		{
+			CreateViewModel();
+			var package1 = new FakePackage("Test", "0.1.0.0") { IsLatestVersion = false };
+			var package2 = new FakePackage("Test", "0.2.0.0") { IsLatestVersion = false };
+			var package3 = new FakePackage("Test", "0.3.0.0") { IsLatestVersion = true };
+			var packages = new FakePackage[] {
+				package1, package2, package3
+			};
+			registeredPackageRepositories.FakeActiveRepository.FakePackages.AddRange(packages);
+			viewModel.ReadPackages();
+			
+			IList<IPackage> allPackages = viewModel.GetPackagesFromPackageSource().ToList();
+			
+			var expectedPackages = new FakePackage[] {
+				package3
+			};
+			PackageCollectionAssert.AreEqual(expectedPackages, allPackages);
+		}
 	}
 }