[ILSpy.AddIn] Fix missing libraries in vsix.

.gitignore

@@ -10,3 +10,4 @@ _ReSharper*/
 *.ReSharper
 *.patch
 .vs/
+/ILSpy.AddIn/Packages/*

ILSpy.AddIn/ILSpy.AddIn.csproj

@@ -84,6 +84,13 @@
     </EmbeddedResource>
   </ItemGroup>
 
+  <ItemGroup>
+	  <Content Include="Packages/*">
+      <IncludeInVSIX>true</IncludeInVSIX>
+      <VSIXSubPath>\</VSIXSubPath>
+	  </Content>
+  </ItemGroup>
+
   <ItemGroup>
     <None Include="source.extension.vsixmanifest">
       <SubType>Designer</SubType>
@@ -134,4 +141,8 @@
     <ProjectReference Update="@(ProjectReference)" Name="%(Filename)" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Packages\" />
+  </ItemGroup>
+
 </Project>

ILSpy.AddIn/Utils.cs

@@ -5,7 +5,7 @@ using System.Text;
 
 namespace ICSharpCode.ILSpy.AddIn
 {
-	class Utils
+	static class Utils
 	{
 		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1060:MovePInvokesToNativeMethodsClass")]
 		[DllImport("shell32.dll", SetLastError = true, CharSet = CharSet.Unicode)]

ILSpy/ILSpy.csproj

@@ -382,4 +382,16 @@
     </PropertyGroup>
   </Target>
 
+  <!--
+  Workaround: nuget packages do not get added to the vsix automatically.
+  Copy them to a local folder and then include them as Content-items in the AddIn.
+  (related to https://github.com/icsharpcode/ILSpy/issues/511)
+  -->
+  <Target Name="PostBuild" AfterTargets="PostBuildEvent">
+	  <Exec Command="mkdir $(SolutionDir)ILSpy.AddIn\packages\" IgnoreExitCode="true" />
+	  <Exec Command="copy $(TargetDir)\System.ValueTuple.dll $(SolutionDir)\ILSpy.AddIn\packages\" />
+	  <Exec Command="copy $(TargetDir)\System.Collections.Immutable.dll $(SolutionDir)\ILSpy.AddIn\packages\" />
+	  <Exec Command="copy $(TargetDir)\ICSharpCode.AvalonEdit.dll $(SolutionDir)\ILSpy.AddIn\packages\" />
+	  <Exec Command="copy $(TargetDir)\Newtonsoft.Json.dll $(SolutionDir)\ILSpy.AddIn\packages\" />
+  </Target>
 </Project>