Simplify Sub.batch inside of Sub.batch

[jfmengels]

We have

Cmd.batch [ a, Cmd.batch [ b, c ], d ]
--> Cmd.batch [ a, b, c, d ]

and the documention says that this also works Sub, but this doesn't get simplified:

Sub.batch [ a, Sub.batch [ b, c ], d ]
--> Sub.batch [ a, b, c, d ]

[jfmengels]

Hmm, this works now for me. Maybe I was on a project with an outdated version :thinking: