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Adding references that already exist for Xamarin android projects

See original GitHub issue

Description

Paket adds transient references for xamarin that seem to be already added (possibly due to some xamarin project imports)

Not sure if this is actually pakets fault, but it does mean it doesn’t work nice with xamarin. I haven’t tested if nuget fails similarily.

Repro steps

Create New solution
Add xamarin csharp android project
Add paket.references and paket.dependencies with “Hopac”
paket install
build in visual studio 2017

See. https://github.com/btrepp/xamarinpakethopac

Expected behavior

No build errors

Actual behavior

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Xml.XDocument\lib\netstandard1.3\System.Xml.XDocument.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Xml.XDocument.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Threading.Tasks.Parallel\lib\netstandard1.3\System.Threading.Tasks.Parallel.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Threading.Tasks.Parallel.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Threading\lib\netstandard1.3\System.Threading.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Threading.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Runtime.Numerics\lib\netstandard1.3\System.Runtime.Numerics.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Runtime.Numerics.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Reflection.Emit.Lightweight\lib\netstandard1.3\System.Reflection.Emit.Lightweight.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Reflection.Emit.Lightweight.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Reflection.Emit.ILGeneration\lib\netstandard1.3\System.Reflection.Emit.ILGeneration.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Reflection.Emit.ILGeneration.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Reflection.Emit\lib\netstandard1.3\System.Reflection.Emit.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Reflection.Emit.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.ObjectModel\lib\netstandard1.3\System.ObjectModel.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.ObjectModel.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Linq.Queryable\lib\netstandard1.3\System.Linq.Queryable.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Linq.Queryable.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active
Error	CS1703	Multiple assemblies with equivalent identity have been imported: 'C:\Users\Beau\Code\xamarinpaket\packages\System.Collections.Concurrent\lib\netstandard1.3\System.Collections.Concurrent.dll' and 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Facades\System.Collections.Concurrent.dll'. Remove one of the duplicate references.	xamarinpaket	C:\Users\Beau\Code\xamarinpaket\xamarinpaket\CSC	1	Active