pick_list can't use it normally

[Cupnfish]

When I mix using pick_list and tooltip, pick_list does not work properly. Not only this, when mix using the modal (a widget in the iced_aw) and pick_list, pick_list also does not use it normally.

https://user-images.githubusercontent.com/40173605/124373956-7b4b4600-dcc9-11eb-9e59-ed1e0d7b3ef8.mov

[hecrj]

As mentioned in #444, overlays won't work properly when nested because of limitations in our rendering pipeline,

[Cupnfish]

Thank you.

[13r0ck]

#872 adds scrolling to pick lists, so you could hide the arrow by shrinking it's size with a style, then tell the user to scroll through the list

No means perfect, but might prevent you from having to totally rewrite your ui

[Cupnfish]

I have replaced it with other methods. When this issue is solved, I will consider replacing it again.😅