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Android crash on back pressed #20883

@kerams

Description

@kerams

Describe the bug

Android crash on back pressed.

To Reproduce

Run SafeAreaDemo.Android (on API <33, where the button actually does something or comment out the version check), press the back button to move the application to the background.

System.NullReferenceException: Object reference not set to an instance of an object
   at Avalonia.Android.Platform.SkiaPlatform.TopLevelImpl.get_RenderScaling()
   at Avalonia.Controls.PresentationSource.get_RenderScaling()
   at Avalonia.Controls.PresentationSource.get_LayoutScaling()
   at Avalonia.Layout.LayoutHelper.GetLayoutScale(Layoutable)
   at Avalonia.Controls.Presenters.ContentPresenter.VerifyScale()
   at Avalonia.Controls.Presenters.ContentPresenter.get_LayoutThickness()
   at Avalonia.Controls.Presenters.ContentPresenter.Render(DrawingContext)
   at Avalonia.Rendering.Composition.CompositingRenderer.UpdateCore()
   at Avalonia.Rendering.Composition.CompositingRenderer.Update()
   at Avalonia.Rendering.Composition.Compositor.CommitCore()
   at Avalonia.Rendering.Composition.Compositor.Commit()
   at Avalonia.Media.MediaContext.CommitCompositor(Compositor)
   at Avalonia.Media.MediaContext.CommitCompositorsWithThrottling()
   at Avalonia.Media.MediaContext.RenderCore()
   at Avalonia.Media.MediaContext.Render()
   at Avalonia.Threading.DispatcherOperation.InvokeCore()
   at Avalonia.Threading.DispatcherOperation.Execute()
   at Avalonia.Threading.Dispatcher.ExecuteJob(DispatcherOperation)
   at Avalonia.Threading.Dispatcher.ExecuteJobsCore(Boolean)
   at Avalonia.Threading.Dispatcher.Signaled()
   at Avalonia.Android.AndroidDispatcherImpl.OnSignaled()
   at Java.Lang.Runnable.Run()
   at Java.Lang.IRunnableInvoker.n_Run(IntPtr jnienv, IntPtr native__this)

Expected behavior

Application survives and can be brought to the foreground again. Mobile integration test suite is created:)

Avalonia version

master

OS

Android

Additional context

No response

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