[iOS] Popover modifier should automatically size popover based on content size

Number:rdar://FB7650902 Date Originated:04/03/2020
Status:Open Resolved:Open
Product:SwiftUI Product Version:11.3.1
Classification:Bug Reproducible:Always
When using the `popover` modifier in SwiftUI on iOS it should set the size of the popover based on the content shown inside of it. It seems to do this when you use the modifier on macOS, but on iOS it's a static, somewhat large size. To reproduce just use the modifier with a small view for the content.


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