How to show popover for item in ForEach in SwiftUI

Issue #618

Create custom Binding

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List {
ForEach(self.items) { (item: item) in
ItemRowView(item: item)
.popover(isPresented: self.makeIsPresented(item: item)) {
ItemDetailView(item: item)
}
}
}

func makeIsPresented(item: Item) -> Binding<Bool> {
return .init(get: {
return self.selectedId == item.id
}, set: { _ in
self.selectedId = nil
})
}
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