suggested changes

Avalonia.sln

@@ -128,7 +128,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ControlCatalog.NetCore", "s
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Props", "Props", "{F3AC8BC1-27F5-4255-9AFC-04ABFD11683A}"
 	ProjectSection(SolutionItems) = preProject
-		build\Avalonia.Designer.HostApp.props = build\Avalonia.Designer.HostApp.props
 		build\Base.props = build\Base.props
 		build\Binding.props = build\Binding.props
 		build\JetBrains.Annotations.props = build\JetBrains.Annotations.props

build/Avalonia.Designer.HostApp.props → packages/Avalonia/Avalonia.Designer.HostApp.props

@@ -1,8 +1,10 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Condition=" $(TargetFramework.StartsWith('netcore')) ">
     <AvaloniaPreviewerToolPath>$(MSBuildThisFileDirectory)\..\..\tools\netcoreapp2.0\designer\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerToolPath>
+    <AvaloniaPreviewerStartMode>dotnet exec</AvaloniaPreviewerStartMode>
   </PropertyGroup>
   <PropertyGroup Condition=" !$(TargetFramework.StartsWith('netcore')) ">
     <AvaloniaPreviewerToolPath>$(MSBuildThisFileDirectory)\..\..\tools\net461\designer\Avalonia.Designer.HostApp.exe</AvaloniaPreviewerToolPath>
+    <AvaloniaPreviewerStartMode>exe</AvaloniaPreviewerStartMode>
   </PropertyGroup>
 </Project>

packages/Avalonia/Avalonia.csproj

@@ -27,7 +27,7 @@
         <Visible>false</Visible>
         <BuildAction>None</BuildAction>
       </_PackageFiles>
-      <_PackageFiles Include="../../build/Avalonia.Designer.HostApp.props">
+      <_PackageFiles Include="build/Avalonia.Designer.HostApp.props">
         <PackagePath>build/Avalonia.props</PackagePath>
         <Visible>false</Visible>
         <BuildAction>None</BuildAction>