如何阻止SwiftUI视图动画级联?

我之前问过这个问题,但我知道我已经把它提炼成了一块可以在操场上运行的示例代码。

问题的基础是,我有两个视图被父视图切换。内容视图和设置视图。内容视图有三个标签,第三个标签的框架设置为与其他两个标签的最宽尺寸相匹配。

在我将动画添加到在“内容”视图和“设置”视图之间切换的视图之前,这一切都很正常。但当我添加动画时,它会“级联”到内容视图中,导致3标签在屏幕上飞过,而不仅仅是正确对齐。

下面是示例代码,如果你想玩它,可以将其剪切并粘贴到操场上。

import PlaygroundSupport
import SwiftUI

// Preference key which tracks the largest with of a label.
struct LabelWidthPreferenceKey: PreferenceKey {
    static var defaultValue: CGFloat = .zero
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = max(value, nextValue())
    }
}

// View modifier for tracking the size of a label.
struct LabelWidthObserver: ViewModifier {

    func body(content: Content) -> some View {
        content.background {
            GeometryReader { geometry in
                Color.clear.preference(key: LabelWidthPreferenceKey.self, value: geometry.size.width)
            }
        }
    }
}

struct RootView: View {
    @State private var showSettings = false
    var body: some View {
        Group {
            if showSettings {
                SettingsView { showSettings.toggle() }
            } else {
                ContentView { showSettings.toggle() }
            }
        }
        .animation(.easeInOut, value: showSettings)
    }
}

struct SettingsView: View {
    let toggleSettings: () -> Void
    var body: some View {
        Text("Here be settings")
        Button("Cancel") { toggleSettings() }
    }
}

struct ContentView: View {
    let toggleSettings: () -> Void
    @State private var labelWidth: CGFloat = 20.0
    var body: some View {
        VStack(alignment: .leading, spacing: 4.0) {
            Text("Line 1").modifier(LabelWidthObserver()).border(.red)
            Text("longer line two").modifier(LabelWidthObserver()).border(.red)

            Text("Line 3")
                .frame(minWidth: labelWidth, alignment: .trailing)
                .border(.green)
            Button("Show settings") { toggleSettings() }
        }
        .onPreferenceChange(LabelWidthPreferenceKey.self) {
            labelWidth = max(labelWidth, $0)
        }
    }
}

PlaygroundPage.current.setLiveView(RootView())

有人知道如何在不触发第三个标签动画的情况下,为两个视图之间的过渡设置动画吗?