Hi guys.
I'd like to add support for multiple preview_path of ActionMailer. (It
could configure only one directory path now.)
Because I think I'd like to configure it in Spree's Rails Engine. (Spree's
repository https://github.com/spree/spree)
For example.
```
initializer "spree.core.mailers_previews" do |app|
app.config.action_mailer.preview_path << File.join(root, "test",
"mailers", "previews") # => spree/core/test/mailers/previews
end
```
Rails's patch is this.
https://github.com/camelmasa/rails/pull/2/files
What do you think about this ?
I think I'd like to create PR when patch is no problem.
Thanks !
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