bug#21463: 25.0.50; lisp-indent-line indents wrongly for multiline sexps

[Artur Malabarba]

This is how the following sexp gets indented by lisp-indent-line

((x
  y) a
  2)

This is how (I believe) it should be indented

((x
  y) a
 2)


This affects emacs-lisp and any other mode that derives from lisp-mode.