Don't insert closing brackets if character under cursor is not a space.

Example code:
```
func foo() {
  let x = 10
  x
}
```

How to reproduce:
1. Move cursor before the 'x' character at line 3
2. Insert the 'b', 'a', 'r', '(' characters.

After step 2, the result will be the following:
```
func foo() {
  let x = 10
  bar()x
}
```

The line 3 should be "bar(x".