Fix: VortexViewReader sometimes can't extract VortexSystem

[jackynb]

Issue:

VortexViewReader cannot extract VortexSystem when VortexView has a sibling of ForEach view that is inside a layout container (for example, HStack { ForEach... }) or a TextField view (Mentioned in #20), which causes functions on VortexProxy fail to run (for example, VortexProxy.burst()).

This issue was addressed by #19 but wasn't merged because it will cause VortexViewReader to read the last VortexSystem rather than the first when it contains multiple VortexView.

Minimal Reproducible Example

struct VortexViewReaderTestView: View {
    var body: some View {
        VortexViewReader { vortexView in
            VStack {
                ZStack {
                    //  Remove `TextField` and `ForEach` for `VortexViewReader` to work again.
                    TextField("", text: .constant("Hello"))
                    HStack {
                        ForEach(0..<3) { _ in
                            Text("Hello")
                        }
                    }
                    
                    VortexView(.confetti) {
                        Rectangle()
                            .fill(.white)
                            .frame(width: 16, height: 16)
                            .tag("square")

                        Circle()
                            .fill(.white)
                            .frame(width: 16)
                            .tag("circle")
                    }
                }
                
                Button("Burst") {
                    print("Particle System: \(String(describing: vortexView.particleSystem))")
                    vortexView.burst()  //  This will fail.
                }
            }
        }
    }
}

#Preview {
    VortexViewReaderTestView()
}

Result

This slightly modified pull request allows VortexViewReader to extract the first VortexSystem in the above situation.

And thanks for making this awesome library :D