Define _WindowsDesktopSdkTargetFrameworkVersionFloor before ...

Define _WindowsDesktopSdkTargetFrameworkVersionFloor before  Microsoft.NET.Sdk.WindowsDesktop.targets is imported (#1077)

* Define _WindowsDesktopSdkTargetFrameworkVersionFloor before  Microsoft.NET.Sdk.WindowsDesktop.targets is imported

* Suppress NETSDK1106

eng/WpfArcadeSdk/tools/Pbt.props

@@ -12,6 +12,14 @@
     <PbtDir>$(ArtifactsTmpDir)PresentationBuildTasks\$(PbtTfm)\</PbtDir>
   </PropertyGroup>
 
+  <!-- 
+    Local markup compilation uses $(InternalMarkupCompilation) instead of $(UseWpf). Suppress the 
+    corresponding SDK warning. 
+  -->
+  <PropertyGroup>
+    <MSBuildWarningsAsMessages>$(MSBuildWarningsAsMessages);NETSDK1106</MSBuildWarningsAsMessages>
+  </PropertyGroup>
+
   <!-- 
     We will use Microsoft.NET.Sdk.WindowsDesktop targets directly when local PresentationBuildTasks is not available
     We do not need to import Microsoft.NET.Sdk.WindowsDesktop.props from the Sdk - this only provides us with 

eng/WpfArcadeSdk/tools/Pbt.targets

@@ -90,7 +90,14 @@
   -->
   <Import Project="$(WpfSourceDir)PresentationBuildTasks\Microsoft.WinFX.targets" 
           Condition="'$(InternalMarkupCompilation)'=='true' And Exists('$(LocalMicrosoftWinFXTargets)') "/>
-  
+
+  <!-- 
+    _WindowsDesktopSdkTargetFrameworkVersionFloor is defined in Microsoft.NET.WindowDesktop.props. 
+    This needs to be defined before Microsoft.NET.Sdk.WindowsDesktop.targets is imported. 
+  -->
+  <PropertyGroup Condition="'$(InternalMarkupCompilation)'=='true' And !Exists('$(LocalMicrosoftWinFXTargets)') ">
+    <_WindowsDesktopSdkTargetFrameworkVersionFloor Condition="'$(_WindowsDesktopSdkTargetFrameworkVersionFloor)' == ''">3.0</_WindowsDesktopSdkTargetFrameworkVersionFloor>
+  </PropertyGroup>
   <Import Sdk="Microsoft.NET.Sdk.WindowsDesktop"
           Project="../targets/Microsoft.NET.Sdk.WindowsDesktop.targets"
           Condition="'$(InternalMarkupCompilation)'=='true' And !Exists('$(LocalMicrosoftWinFXTargets)') "/>