rustdoc trait implementations should be collapsible

[mdinger]

Pages like vec are very repetitive, especially when arrays are involved.It'd be nice if collapse all collapsed the methods inside the Trait Implementations impl's

[Gankra]

Hmm this is a bit tricky. If you want to collapse to search for a fn, this will hide some of the fns. If it's on a trait that you don't know about you might never find it. I suppose you could toss a bulk-collapse on top of the "traits". Or perhaps double-clicking collapse "super collapses" everything.

[mdinger]

Why not just search for the trait? Each trait lists all the functions it supports anyway.

[Gankra]

That requires you to know that it's a trait being invoked. This is perhaps unrealistic; they'll probably search for the fn in the global search.

[mdinger]

I see how this could be problematic.

[Gankra]

I still think this has potential. I'd suggest basically making the "super collapse" buttons step-wise:

lvl 0: show everything
lvl 1: hide examples
lvl 2: hide all descriptions
lvl 3: hide trait methods

- goes up a level; + does down one.

[mdinger]

I wonder about clicking the +/- button multiple times to keep hiding more things. Maybe a dropdown which changes what the +/- does by switching between those levels you suggested.

[EDIT]
Make it default to lvl 1 or something like it.

[steveklabnik]

Triage: no change