UIHostingController should set preferredContentSize

Number:rdar://FB7650894 Date Originated:04/03/2020
Status:Open Resolved:Open
Product:SwiftUI Product Version:11.3.1
Classification:Bug Reproducible:Always
When using a UIHostingController with a SwiftUI view, it will size itself based on the size of the SwiftUI view. However, it doesn't set the `preferredContentSize` property to that value. This makes it not useful when you try to use that hosting controller as content in a popover.

Currently, the workaround I'm using is making a subclass of UIHostingController that just does the following in the viewDidLayoutSubviews method: `preferredContentSize = view.subviews.first?.frame.size ?? .zero`.


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