Generate repositories.config file after NuGet package restore.

The repositories.config contains a list of projects that share the
packages directory. If this is not restored then uninstalling a NuGet
package from one project could end up with NuGet removing it
completely from the packages directory since it believes that no other
project is referencing this NuGet package even if this is not the case.

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

@@ -18,6 +18,9 @@
 
 using System;
 using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop;
 using ICSharpCode.SharpDevelop.Gui;
@@ -71,7 +74,33 @@ namespace ICSharpCode.PackageManagement
 			
 			var runner = new ProcessRunner();
 			runner.WorkingDirectory = Path.GetDirectoryName(solution.FileName);
-			runner.RunInOutputPadAsync(outputMessagesView.OutputCategory, commandLine.Command, commandLine.Arguments).FireAndForget();
+			runner.RunInOutputPadAsync(outputMessagesView.OutputCategory, commandLine.Command, commandLine.Arguments)
+				.ContinueWith(task => OnNuGetPackageRestoreComplete(task));
+		}
+		
+		void OnNuGetPackageRestoreComplete(Task<int> task)
+		{
+			if (task.Exception != null) {
+				LoggingService.Debug(task.Exception.ToString());
+				outputMessagesView.AppendLine(task.Exception.Message);
+			} else {
+				ForceGenerationOfRepositoriesConfigFile();
+			}
+		}
+		
+		/// <summary>
+		/// Create a Package Manager for each project to force a new repositories.config file
+		/// to be generated with references to all projects that have NuGet packages.
+		/// </summary>
+		void ForceGenerationOfRepositoriesConfigFile()
+		{
+			try {
+				var repository = PackageManagementServices.RegisteredPackageRepositories.CreateAggregateRepository();
+				var projects = solution.GetProjects(repository).ToList();
+			} catch (Exception ex) {
+				LoggingService.Debug(ex.ToString());
+				outputMessagesView.AppendLine(ex.Message);
+			}
 		}
 	}
 }