When using the Postoffice Compat module in order to route legacy core and contrib mail through postoffice, some parts of a mail is typically rendered within a hook_mail implementation. This can lead to inconsistent selection of templates and CSS for sites which use separate backend and frontend themes.
Typical symptoms of this problem are:
Introduce an optional module which comes with a decorator for the mail manager service. This decorator uses the same mechanism to switch to the default theme as the postoffice Theme mailer middleware.
Fixed
1.1
Code
Automatically closed - issue fixed for 2 weeks with no activity.