Issue with ToFullPathInCorrectCase

[PetSerAl]

I have my work folder on subst drive:

subst.exe M: C:\Some\Other\Path

Suppose I have M:\Project\src\Project.csproj and I want to create M:\Project\Project.sln. I expect, that solution file will contain relative path src\Project.csproj, but due to usage GetFinalPathNameByHandle here:

slngen/src/Shared/ExtensionMethods.Shared.cs

Lines 42 to 44 in 7b1ac24

	StringBuilder stringBuilder = new StringBuilder(GetFinalPathNameByHandle(stream.SafeFileHandle, null, 0, 0));
	GetFinalPathNameByHandle(stream.SafeFileHandle, stringBuilder, stringBuilder.Capacity, 0);

the path expanded to C:\Some\Other\Path\Project\src\Project.csproj. That prevent SlnGen to see it as relative to solution file M:\Project\Project.sln and full path included in solution. That in turn prevent VS Code C# extension to recognize M:\Project\src\Project.csproj as part of solution and provide proper syntax highlighting, completion, etc.