Rustdoc: Add "-" shortcut that does same as "+"

[Havvy]

"+" on rustdoc expands or collapses all sections on the page. It'd be nice if "-" does too. At least on US keywords, it requires a shift for "+" but not for "-".

[GuillaumeGomez]

Ok, here you go.

[raggi]

I'd also like a way to make this sticky (e.g. ctrl+- -> writes a local storage / cookie that persists the state)

[GuillaumeGomez]

Not sure to understand what you're asking.

[raggi]

I'm asking that I can press: CTRL - and then load a new doc page, and the page will load collapsed. If I press - or + it will toggle the collapse state. If I press CTRL - or CTRL + it will toggle the persistent state.

[GuillaumeGomez]

I see. Hum... Do you mind opening another issue for this please? I think it'll require a bit of discussion before that (because ctrl + / ctrl - are also used to zoom in/out in a browser).