Autocomplete and page scroll

[FilipeQ]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Autocomplete options should stay near input

What is the current behavior?

Autocomplete options don't change css top property when we scroll on the page.
After scroll autocomplete options don't follow the input position.

What are the steps to reproduce?

https://plnkr.co/edit/I2TAghRrpbzmgQK5SsXd?p=preview

I use the material Docs plunker and add some fake scroll, to reproduce the problem.

[fxck]

None of the Overlay utilising components does. There's a PR for a solution that will block scrolling while any overlay is open, but #1971 either there's some problem with it or the assignee is busy.

[ronanbrett]

I got around it by sticking a scroll dispatcher on the body and updating the position manually as the user scrolls, but there are some issues on iOS safari with fixed positioning when the keyboards open.

[pabx06]

@fxck would you mind sharing the code that fix it ? having the same issue here

[dalemanthei]

It is perhaps a naive implementation but it seems like a stacking context would be one solution. What don't I get about what the overlay is providing?

[jelbourn]

Now tracking via #4093

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