Wrong indentation on if-then with comments

Comments at the end of this `if` makes the `then` block to not get indented.
```
if (prd.source()
.isPresent()) // exclude generated productions like casts
prd = null;
```
Line 331. IntelliJ reports this as well.
I think the problem comes from the if condition that got split into two lines. If I move the comment to a separate line, then indentation works as expected.