rust.vim - do not set g:rust_recommended_style by default

[lpil]

Hello!

Modifying indentation rules by default is very aggressive, and not something I've come across in any other vim plugin. Please make this an opt-in feature.

Cheers,
Louis

[nagisa]

👍

I also found it very strange when gq} started wrapping comments to 100 char column, rather than 80 I’m used to.

[chris-morgan]

👎

While it is not universal by any means, it isn’t exactly uncommon to have file formats change these things—and when they do, they don’t even tend to have a convenient off switch like we do, which is a point slightly in our favour here.

Examples from the main distribution that alter some or all of these options: aap, abap, ada, bst, changelog, clojure, cobol, falcon, flexwiki, fortran, gitcommit, haml, j, make, ocaml, occam, python, rst, sml, vroom, yaml, zimbu.

We have strong conventions; we should default to keeping them, otherwise the truly will disappear.

[reem]

Agree with @chris-morgan, I would like this to stay set by default as it helps enforce universal conventions for rust formatting until we get a rustfmt.

[steveklabnik]

Also agreed, this is the behavior we want.