`.toolbar(.hidden)` doesn't behave like iOS

[dfabulich]

https://github.com/skiptools/skipapp-showcase/blob/main/Sources/Showcase/ToolbarPlayground.swift

In the Toolbar Playground, there's a "Hide Bars" playground.

case .hideBars:
    #if os(macOS)
    Text("Not supported on macOS")
    #else
    HideToolbarsPlayground()
        .navigationTitle($0.title)
        .toolbar(.hidden)
        .ignoresSafeArea()
    #endif

On iOS, this playground hides the navigation bar, leaving the bottom tab bar visible. On the "Medium Phone API 36" Android emulator, it hides both the navigation bar and the bottom tab bar.

https://developer.apple.com/documentation/swiftui/view/toolbar(_:for:)

Parameters

visibility

The preferred visibility of the bar.

bars

The bars to update the visibility of or automatic if empty.

https://developer.apple.com/documentation/swiftui/toolbarplacement/automatic

Depending on the context, this may refer to the navigation bar of an app on iOS, or watchOS, the tab bar of an app on tvOS, or the window toolbar / window titlebar of an app on macOS.