WinForms XML files from runtime pack are added to deps.json and prevent WPF/WinForms apps from starting

• .NET Core Version: Latest daily build as of today: 3.0.100-preview4-010277
• Have you experienced this same bug with .NET Framework?: No

Problem description:

XML files are included in deps json which prevent the apphost from starting the WPF/WinForms app

I found the following XML files in the nuget dir, and they're all added to the deps.json file:

System.Design.xml
System.Drawing.Design.xml
System.Drawing.xml
System.Windows.Forms.Design.Editors.xml
System.Windows.Forms.Design.xml
System.Windows.Forms.xml

Actual behavior:

A message box is shown, eg.:

---------------------------
wpftest.exe
---------------------------
Error:
  An assembly specified in the application dependencies manifest (wpftest.deps.json) has already been found but with a different file extension:
    package: 'runtimepack.runtime.win-x64.Microsoft.WindowsDesktop.App', version: '3.0.0-preview-27408-15'
    path: './System.Design.xml'
    previously found assembly: 'C:\wpftest\bin\Release\netcoreapp3.0\win-x64\publish\System.Design.dll'

---------------------------
OK   
---------------------------

Expected behavior:

It starts

Minimal repro:

Use latest daily build of .NET Core SDK, eg. 3.0.100-preview4-010277

Build:

# or replace wpf with winforms
dotnet new wpf
dotnet publish -c Release -f netcoreapp3.0 -r win-x64 --self-contained

Run:

bin\Release\netcoreapp3.0\win-x64\publish\wpftest.exe

[zsd4yr]

Fixed by #441