rustdoc: help widget oversized on mobile and can't scroll

[jsha]

Steps to reproduce:

1. Visit a documentation page on crates.io on a mobile browser (Brave 1.15.73 / Chromium 86, Android 11 on a Pixel 3).
2. Click the "?" icon next to the search box.

Expected result: Help dialog pops up

Actual result: Help dialog pops up, but is too big for the screen and not scrollable (see screenshot).

Note also that the keyboard shortcut section can probably be elided on mobile since there is usually no keyboard (though there can be!).

[Nemo157]

Appears to be a rustdoc issue, I can reproduce on https://doc.rust-lang.org/nightly/std/

[GuillaumeGomez]

Ah right, it wasn't possible before we added the button to have this popup. Maybe we should hide it when we're on mobile?

[GuillaumeGomez]

#77979 is just a quick fix for now: we're still debating about whether or not we want to display this help popup and if so, how.

[jsha]

I propose to close this and consider #77979 the long-term fix. I think hiding the help button on mobile is the right thing to do.

[GuillaumeGomez]

But that prevents to have access to the search help too, which is why I'm not super happy about it...

[jsha]

Aha, that makes sense.