Solution for checking if a given view is an "empty view"

View+IsEmpty.swift

import SwiftUI

public extension View {
    var isEmpty: Bool {
        (self as? IsEmptyView)?.isEmpty ?? false
    }
}

private protocol IsEmptyView {
    var isEmpty: Bool { get }
}

extension EmptyView: IsEmptyView {
    var isEmpty: Bool { true }
}

extension _ConditionalContent: IsEmptyView {
    var isEmpty: Bool {
        switch self.storage {
        case .trueContent(let content):
            (content as? IsEmptyView)?.isEmpty ?? false
        case .falseContent(let content):
            (content as? IsEmptyView)?.isEmpty ?? false
        }
    }
}