[folding] show comment first line for folded sections

I think it could be really useful to change the multiline comment folding.

When you fold a comment like this (like above php function) :

/**
 * Print person name on terminal
 *
 * @param person $p
 * @return void
 */

You see this :

/** ...

In some editors like phpStorm or Eclipse, it’s folded like this :

* Print person name on terminal ...

That’s very more useful 😉

Is it possible to implement this kind of folding ?

[gorn]

Language agnostic folding has been implemented, so this can be implemented as well now.

[abhishekmadhu]

Is someone working on a PR? If not, I would like to try my hands on this. Will this be a good first issue for the repository?

@aeschli?