Failure when using SystemNavigationManager.GetForCurrentView()

[jeromelaban]

Current behavior

The following:

SystemNavigationManager.GetForCurrentView().BackRequested += App_BackRequested;

Fails in the playground canary:

System.Collections.Generic.KeyNotFoundException: Arg_KeyNotFoundWithKey, Microsoft.UI.WindowId
dotnet.native.js:8    at System.Collections.Generic.Dictionary`2[[Microsoft.UI.WindowId, Uno, Version=255.255.255.255, Culture=neutral, PublicKeyToken=null],[Windows.UI.ViewManagement.ApplicationView, Uno, Version=255.255.255.255, Culture=neutral, PublicKeyToken=null]].get_Item(WindowId key)
dotnet.native.js:8    at Windows.UI.ViewManagement.ApplicationView.GetForWindowId(WindowId windowId)
dotnet.native.js:8    at Windows.UI.ViewManagement.ApplicationView.GetForCurrentView()
dotnet.native.js:8    at Uno.UI.Demo.App.OnLaunched(LaunchActivatedEventArgs e)

Expected behavior

No failure

How to reproduce it (as minimally and precisely as possible)

No response

Workaround

No response

Works on UWP/WinUI

None

Environment

No response

NuGet package version(s)

5.2.0-dev.412

Affected platforms

No response

IDE

No response

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response

[Youssef1313]

This generally means that GetForCurrentView is called very early, before the window is initialized.