Expansion for user keyword in ssh_config

[list at moeller-mail.eu]

Hi Openssh team,

    I am trying to setup rules in the ssh_config , ~/.ssh/config file to automate some logins.  The case I have would require
the User keyword to include %n . 
  e.g. 

    Host *.domain.com.
        User  me#%n
        Hostname gw.domain.com


   It seems to work on the latest clients except on Windows. I wonder when the expansion for User changed ?  Can someone point me to it ?  

   I tried to check https://github.com/PowerShell/openssh-portable which I think is the Windows source, but could not find the difference. 

Thank you
Markus