Here's part 2, in which I'm skipping the next 3 commits:

https://github.com/ruby/ruby/commit/85df40e9ab4559cd4ddde3f106ab56c76a808cc8
https://github.com/ruby/ruby/commit/6b0dc7fd81b25bc66681548b8b82f38258f7e08c
https://github.com/ruby/ruby/commit/862048e28d26112af1e67205cfd1c16564590bce

Because as far as I can tell, they hijack the `ruby-deep-indent-paren' 
behavior. IOW, with these applied, the indentation works as though the 
above variable is always nil (with a small improvement in the nested 
case, to be fair), so they don't make sense.

Instead, I added two tests, for `ruby-deep-indent-paren' enabled and 
disabled, and also ported all examples from test/misc/test_ruby_mode.rb.