Demo of problem when using index to select an entry to display in a sheet/popup

SheetWithIndexProblemDemo.swift

//
//  SheetWithIndexProblemDemo.swift.swift
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
//  of the Software, and to permit persons to whom the Software is furnished to do so,
//  subject to the following conditions:
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
//  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
//  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
//  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
//  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
//  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//  Created by Adam Fordyce on 24/05/2021.
//  Copyright © 2021 Adam Fordyce. All rights reserved.
//

import SwiftUI

private let defaultUsers: [String] = {
    var users = [String]()
    for userIndex in 0..<10 {
        users.append("User \(userIndex)")
    }
    return users
}()

struct SheetWithIndexProblemDemo: View {
    
    fileprivate var users = defaultUsers
    
    @State private var selectedUserIndex = 0
    @State private var showingUserDetails = false
    
    var body: some View {
        VStack {
            ForEach(0..<users.count, id: \.self) { index in
                Text(self.users[index])
                    .font(.title)
                    .onTapGesture {
                        self.selectedUserIndex = index
                        self.showingUserDetails = true
                    }
            }
        }
        .sheet(isPresented: $showingUserDetails) {
            Text(self.users[self.selectedUserIndex])
                .font(.title)
        }
    }
}

struct EditingUserProblemWithIndex_Previews: PreviewProvider {
    struct EditingUserProblemWithIndex_Harness: View {

        var body: some View {
            SheetWithIndexProblemDemo()
        }
    }

    static var previews: some View {
        EditingUserProblemWithIndex_Harness()
    }
}