Fix error when installing Fody addins with NuGet.

Implement EnvDTE ProjectItem.Save()

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

@@ -317,5 +317,10 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 		{
 			return FileUtility.IsBaseDirectory(MSBuildProject.Directory, filePath);
 		}
+		
+		internal void SaveFile(IViewContent view)
+		{
+			fileService.SaveFile(view);
+		}
 	}
 }

src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/ProjectItem.cs

@@ -229,5 +229,13 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 		{
 			return Path.GetDirectoryName(GetProjectItemRelativePathToProject());
 		}
+		
+		public void Save(string fileName = null)
+		{
+			IViewContent view = containingProject.GetOpenFile(FileName);
+			if (view != null) {
+				containingProject.SaveFile(view);
+			}
+		}
 	}
 }

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

@@ -17,6 +17,7 @@ namespace ICSharpCode.PackageManagement
 		bool FileExists(string fileName);
 		string[] GetFiles(string path);
 		string[] GetDirectories(string path);
+		void SaveFile(IViewContent view);
 		
 		void ParseFile(string fileName);
 		ICompilationUnit GetCompilationUnit(string fileName);

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

@@ -60,6 +60,18 @@ namespace ICSharpCode.PackageManagement
 			}
 		}
 		
+		public void SaveFile(IViewContent view)
+		{
+			if (WorkbenchSingleton.InvokeRequired) {
+				Action<IViewContent> action = SaveFile;
+				WorkbenchSingleton.SafeThreadCall<IViewContent>(action, view);
+			} else {
+				if (view.IsDirty) {
+					view.Files.ForEach(ICSharpCode.SharpDevelop.Commands.SaveFile.Save);
+				}
+			}
+		}
+		
 		public bool FileExists(string fileName)
 		{
 			if (WorkbenchSingleton.InvokeRequired) {

src/AddIns/Misc/PackageManagement/SharpDevelop.EnvDTE/Src/ProjectItem.vb

@@ -18,5 +18,6 @@ Namespace EnvDTE
 		Sub Delete()
 		Sub Remove()
 		Function Open(viewKind As String) As Global.EnvDTE.Window
+		Sub Save(Optional fileName As String = Nothing)
 	End Interface
 End Namespace

src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/ProjectItemTests.cs

@@ -39,11 +39,12 @@ namespace PackageManagement.Tests.EnvDTE
 			OpenFileInSharpDevelop(fileName, dirty: true);
 		}
 		
-		void OpenFileInSharpDevelop(string fileName, bool dirty)
+		IViewContent OpenFileInSharpDevelop(string fileName, bool dirty)
 		{
 			IViewContent view = MockRepository.GenerateStub<IViewContent>();
 			view.Stub(v => v.IsDirty).Return(dirty);
 			fakeFileService.AddOpenView(view, fileName);
+			return view;
 		}
 		
 		[Test]
@@ -400,5 +401,32 @@ namespace PackageManagement.Tests.EnvDTE
 			global::EnvDTE.ProjectItem item = collection.Item("program.cs");
 			Assert.AreEqual("program.cs", item.Name);
 		}
+		
+		[Test]
+		public void Save_FileNameNotPassed_SavesFile()
+		{
+			CreateProjectItems();
+			msbuildProject.FileName = @"d:\projects\MyProject\MyProject.csproj";
+			msbuildProject.AddFile(@"program.cs");
+			IViewContent view = OpenFileInSharpDevelop(@"d:\projects\MyProject\program.cs", false);
+			global::EnvDTE.ProjectItem item = projectItems.Item("program.cs");
+			
+			item.Save();
+			
+			Assert.AreEqual(view, fakeFileService.ViewContentPassedToSaveFile);
+		}
+		
+		[Test]
+		public void Save_FileNameNotPassedAndFileNotOpen_FileNotSaved()
+		{
+			CreateProjectItems();
+			msbuildProject.FileName = @"d:\projects\MyProject\MyProject.csproj";
+			msbuildProject.AddFile(@"program.cs");
+			global::EnvDTE.ProjectItem item = projectItems.Item("program.cs");
+			
+			item.Save();
+			
+			Assert.IsFalse(fakeFileService.IsSaveFileCalled);
+		}
 	}
 }

src/AddIns/Misc/PackageManagement/Test/Src/Helpers/FakeFileService.cs

@@ -140,5 +140,14 @@ namespace PackageManagement.Tests.Helpers
 			}
 			return null;
 		}
+		
+		public IViewContent ViewContentPassedToSaveFile;
+		public bool IsSaveFileCalled;
+		
+		public void SaveFile(IViewContent view)
+		{
+			IsSaveFileCalled = true;
+			ViewContentPassedToSaveFile = view;
+		}
 	}
 }