Unicode characters show as question marks in method documentation hover window

[ktos]

I have a few methods which documentation contains Unicode (UTF-8) characters. When showing documentation by hovering over a method I get garbage question mark characters instead in this window.

Looks like (when hovering over Jednorożec's constructor):

XML documentation for this method:

All files are saved as UTF-8.

[jrieken]

This issue was moved to dotnet/vscode-csharp#4