paxos / navigationsplitviewrestorationbug Goto Github PK

Demonstrates an issue where the toolbar of a NavigationSplitView looks scrambled when SwiftUI does a window restoration.

To reproduce:

• Make sure window restoration is tuned on in system settings ("Close windows when quitting an application" needs to be off)
• Open app
• click "Open Window A" button
• click "Open Window B" button
• See two windows that look correct
• Close app (CMD+Q)
• Open app again: one window toolbar is scrambled (divider is at the wrong position).

This is 100% caused by setting an explicit ID on the view:

            ContentView()
                .id(value) // <-- issue

But: Without an explicit ID, @StateObject is incorrectly initiated multiple times.