Allow to use `usePortal` on the Menu component.

When the menu trigger is within an overflown element it’s necessary to render the menu using a portal in the same way it’s already possible with the Popover component.

Describe the solution you’d like Same interface as the Popover component, just another prop usePortal: boolean;

Describe alternatives you’ve considered I tried implementing myself by passing the prop all the way down to the Popper component but I got an error that I was not sure how to fix with the focusableItems

[bjgrosse]

@segunadebayo here is a sandbox that reproduces this. If you don’t set usePortal=true on the MenuList, then the menu gets cut off. If you do usePortal then you get an error about the focusableItems. focusableItems is null at the time of opening the menu.

Turning autoSelect off gets past this error, but then other things don’t work such as the closeOnBlur. Seems that a various number of things need to be changed to allow the portal.

https://codesandbox.io/s/beautiful-cray-dk9eq

[paambaati]

For someone still stuck on v0.8.x unfortunately, is there a workaround or a patch for this? Our codebase is quite large and I don’t have the resources (yet) to start migrating to 1.x, so I’d appreciate any help here.