CSharpier.MSBuild does not work with dotnet watch run

[belav]

There may be a couple problems here.
When I use CSharpier.MSBuild on one small project with dotnet watch run, it appears to get into an endless loop of formatting/triggering dotnet watch.

I believe this is because CSharpier writes out a file even if nothing was changed by formatting it.

When using CSharpier.MSBuild on CShapier there is a slightly different outcome which may be caused by the same problem.

The build errors in this come from that fact that somehow files are getting there contents changed to a single new line.

[belav]

We can possibly get a list of compiled items to pass to csharpier. Which will get us partly there and will make sure csharpier runs a lot faster. It might be @compile
I think we'll still have to have csharpier not write out a file if it hasn't changed.