Style/Next autocorrect breaks with nested conditionals

[Drenmi]

When autocorrecting a Style/Next offense with nested conditionals, it results in invalid code. It seems like the inner conditional is erroneously targeted for the correction. See example below.

---

Expected behavior

RuboCop autocorrects to:

foos.each do |foo|
  next if foo[:bar]

  if baz
    do_something
  else
    do_something_else
  end
end

Actual behavior

RuboCop autcorrects to:

foos.each do |foo|
  unless foo[:bar]
    next unless baz
      do_something
    else
      do_something_else
  end
end

(Note the missing end.)

Steps to reproduce the problem

Run bundle exec rubocop -a on:

foos.each do |foo|
  unless foo[:bar]
    if baz
      do_something
    else
      do_something_else
    end
  end
end

RuboCop version

$ rubocop -V
0.46.0 (using Parser 2.3.3.1, running on ruby 2.3.3 x86_64-darwin15)