Auto indent incorrect

1.
Example (incorrect):

``` scheme
(+ 1
  (+ 3
    (+ 3 4)))
```

The right way is:

``` scheme
(+ 1
   (+ 3 
      (+ 3 4)))
```

2.
when add a new expression, the new line indent as below:

``` scheme
(+ 1
  (+ 3
    (+ 3 4)))

    (+ 2 3)
```
