Microsoft.NET.StringTools missing net35 assets

[mmitche]

This may be a non-issue, but net35 assets are missing from Microsoft.NET.StringTools produced out of msbuild:

 <AssetMapping Id="Microsoft.NET.StringTools" Type="Package">
      <DiffFile>D:\a\_work\1\a\vmr-assets\PackageArtifacts\Microsoft.NET.StringTools.17.15.0-preview-25176-115.nupkg</DiffFile>
      <BaseFile>D:\a\_work\1\a\base-assets\msbuild\shipping\packages\Microsoft.NET.StringTools.17.15.0-preview-25170-04.nupkg</BaseFile>
      <EvaluationErrors />
      <Issues>
        <Issue Type="PackageTFMs" Description="Package target frameworks differ: base=net35,net472,net9.0,netstandard2.0, diff=net472,net9.0,netstandard2.0" />
      </Issues>
    </AssetMapping>

[ViktorHofer]

MSBuild only builds the net35 TFM for StringTools when targeting desktop msbuild: https://github.com/dotnet/msbuild/blob/21a35212ae90eb7587be30964cf384ac75d5a353/src/StringTools/StringTools.csproj#L4C37-L4C55

@rainersigwald @ladipro do you remember why?

[rainersigwald]

I don't--it might have been in a time when targeting net35 didn't work well from core SDK? It looks like it works today and I can't think of a reason it has to stay as it currently is.

[ViktorHofer]

Submitted dotnet/msbuild#11641 to try removing some of the differences between msbuild and dotnet msbuild.

[mmitche]

Resolved with dotnet/msbuild#11641