Incorrect indentation after case of block

The following valid code
```elm
a =
case Nothing of
Just _ ->
0

Nothing ->
0
|> List.singleton
```
gets reformatted into
```elm
a =
case Nothing of
Just _ ->
0

Nothing ->
0
|> List.singleton
```
which is invalid due to `|> List.singleton` now applying only to the nothing case instead of the entire case of block.

The issue provides a minimal Elm input and the incorrect formatted output; start by reproducing this case with elm-format and comparing the indentation around the case expression. Done means the pipe remains aligned outside the Nothing branch and the formatted result remains valid Elm.

Written by the indexing model from the issue text.