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System.ArgumentOutOfRangeException in ReactiveCollectionMixins

See original GitHub issue

I’ve received this bug report today that makes my app crash: https://github.com/zkSNACKs/WalletWasabi/issues/750

There are way too many turtles down as to spot at first sight what’s causing this issue. While I am investigating it, I was hoping someone else have a better eye to spot the problem here, due to the familiarity with the code base.

Relevant lines:

Avalonia.Base\Threading\AvaloniaScheduler.cs:line 40
Avalonia.Base\Threading\Dispatcher.cs:line 65
Avalonia.Controls\Application.cs:line 237

Stack trace:

2018-10-21 17:08:01 CRITICAL Program: System.ArgumentOutOfRangeException: Index must be within the bounds of the List.
Parameter name: index
   at System.Collections.Generic.List`1.Insert(Int32 index, T item)
   at ReactiveUI.Legacy.ReactiveDerivedCollection`2.onSourceCollectionChanged(NotifyCollectionChangedEventArgs args) in D:\a\1\s\src\ReactiveUI\ReactiveCollectionMixins.cs:line 494
   at System.Reactive.AnonymousSafeObserver`1.OnNext(T value) in D:\a\1\s\Rx.NET\Source\src\System.Reactive\AnonymousSafeObserver.cs:line 46
   at System.Reactive.ScheduledObserver`1.Run(Object state, Action`1 recurse) in D:\a\1\s\Rx.NET\Source\src\System.Reactive\Internal\ScheduledObserver.cs:line 254
   at System.Reactive.Concurrency.Scheduler.InvokeRec1[TState](IScheduler scheduler, Pair`2 pair) in D:\a\1\s\Rx.NET\Source\src\System.Reactive\Concurrency\Scheduler.Recursive.cs:line 89
   at Avalonia.Threading.AvaloniaScheduler.<>c__DisplayClass2_1`1.<Schedule>b__1() in C:\projects\Avalonia\src\Avalonia.Base\Threading\AvaloniaScheduler.cs:line 40
   at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) in C:\projects\Avalonia\src\Avalonia.Base\Threading\JobRunner.cs:line 40
   at Avalonia.Win32.Win32Platform.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam)
   at Avalonia.Win32.Interop.UnmanagedMethods.DispatchMessage(MSG& lpmsg)
   at Avalonia.Win32.Win32Platform.RunLoop(CancellationToken cancellationToken)
   at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) in C:\projects\Avalonia\src\Avalonia.Base\Threading\Dispatcher.cs:line 65
   at Avalonia.Application.Run(Window mainWindow) in C:\projects\Avalonia\src\Avalonia.Controls\Application.cs:line 237
   at AvalonStudio.Shell.Shell.StartShellApp[TAppBuilder,TMainWindow](TAppBuilder builder, String appName, IDockFactory layoutFactory, Func`1 dataContextProvider) in C:\Users\user\Desktop\WalletWasabi\WalletWasabi.Dependencies\AvalonStudio.Shell\src\AvalonStudio.Shell\Shell.cs:line 14
   at WalletWasabi.Gui.Program.Main(String[] args) in C:\Users\user\Desktop\WalletWasabi\WalletWasabi.Gui\Program.cs:line 26