Fix target framework for NuGet dependency being ignored.

A NuGet package can specify a dependency on another NuGet package when
a particular target framework is being installed:

    <dependencies>
       <group targetFramework="net40">
          <dependency id="MyDependency" version="1.0"/>
       </group>
    </dependencies>

Installing this NuGet package into a project that targets net20 and
the MyDependency being unavailable on any NuGet feed should not fail.
Only installing the NuGet package into a project that targets net40
will this dependency be resolved.

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

@@ -19,7 +19,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-
 using System.Runtime.Versioning;
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.EnvDTE;

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

@@ -19,8 +19,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-
 using System.Runtime.Versioning;
+
 using ICSharpCode.PackageManagement.EnvDTE;
 using NuGet;
 

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

@@ -19,8 +19,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-
 using System.Runtime.Versioning;
+
 using ICSharpCode.PackageManagement.EnvDTE;
 using ICSharpCode.SharpDevelop.Project;
 using NuGet;

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

@@ -32,7 +32,7 @@ namespace ICSharpCode.PackageManagement
 			return new InstallWalker(
 				localRepository,
 				sourceRepository,
-				null,
+				installAction.ProjectTargetFramework,
 				logger,
 				installAction.IgnoreDependencies,
 				installAction.AllowPrereleaseVersions,

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

@@ -17,6 +17,7 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System;
+using System.Runtime.Versioning;
 using ICSharpCode.PackageManagement.Scripting;
 using ICSharpCode.SharpDevelop.Project;
 using NuGet;
@@ -43,6 +44,10 @@ namespace ICSharpCode.PackageManagement
 		public IPackageScriptRunner PackageScriptRunner { get; set; }
 		public bool AllowPrereleaseVersions { get; set; }
 		
+		public FrameworkName ProjectTargetFramework {
+			get { return Project.TargetFramework; }
+		}
+		
 		public virtual bool HasPackageScriptsToRun()
 		{
 			return false;

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

@@ -19,8 +19,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-
 using System.Runtime.Versioning;
+
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.Design;
 using ICSharpCode.PackageManagement.EnvDTE;

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

@@ -17,6 +17,7 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System;
+using System.Runtime.Versioning;
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.Design;
 using ICSharpCode.PackageManagement.Scripting;
@@ -170,5 +171,17 @@ namespace PackageManagement.Tests
 			
 			Assert.AreEqual(expectedException, exception);
 		}
+		
+		[Test]
+		public void ProjectTargetFramework_ProjectTargetFrameworkIsNet40_ReturnsNet40()
+		{
+			CreateAction();
+			var expectedTargetFramework = new FrameworkName(".NETFramework, Version=v4.0");
+			fakeProject.TargetFramework = expectedTargetFramework;
+			
+			FrameworkName targetFramework = action.ProjectTargetFramework;
+			
+			Assert.AreEqual(expectedTargetFramework, targetFramework);
+		}
 	}
 }