Fix missing ScheduledSubject (#4)

Author: ChrisPulman

src/ReactiveMarbles.Command/RxCommand.cs

@@ -530,7 +530,7 @@ public class RxCommand<TParam, TResult> : IRxCommand<TParam, TResult>
 {
     private readonly IObservable<bool> _canExecute;
     private readonly IDisposable _canExecuteSubscription;
-    private readonly ScheduledSubject<Exception> _exceptions;
+    private readonly ProxyScheduledSubject<Exception> _exceptions;
     private readonly Func<TParam, IObservable<TResult>> _execute;
     private readonly Subject<ExecutionInfo> _executionInfo;
     private readonly IObservable<bool> _isExecuting;
@@ -622,7 +622,7 @@ public RxCommand(
         _execute = execute ?? throw new ArgumentNullException(nameof(execute));
         var coreRegistration = ServiceLocator.Current().GetService<ICoreRegistration>();
         var scheduler = outputScheduler ?? coreRegistration.MainThreadScheduler;
-        _exceptions = new ScheduledSubject<Exception>(scheduler, coreRegistration.ExceptionHandler);
+        _exceptions = new ProxyScheduledSubject<Exception>(scheduler, coreRegistration.ExceptionHandler);
         _executionInfo = new Subject<ExecutionInfo>();
         _synchronizedExecutionInfo = Subject.Synchronize(_executionInfo, scheduler);
         _isExecuting = _synchronizedExecutionInfo.Scan(

src/directory.packages.props

@@ -5,39 +5,39 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageVersion Include="Nerdbank.GitVersioning" Version="3.4.231" />
+    <PackageVersion Include="Nerdbank.GitVersioning" Version="3.5.119" />
   </ItemGroup>
 
   <ItemGroup>
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.354" />
-    <PackageVersion Include="Roslynator.Analyzers" Version="3.2.2" />
+    <PackageVersion Include="Roslynator.Analyzers" Version="4.2.0" />
   </ItemGroup>
 
   <ItemGroup>
     <PackageVersion Include="BenchmarkDotNet" Version="0.13.1" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageVersion Include="DynamicData" Version="7.6.5" />
-    <PackageVersion Include="ReactiveMarbles.Mvvm" Version="1.0.28" />
-    <PackageVersion Include="ReactiveMarbles.PropertyChanged" Version="2.0.6" />
+    <PackageVersion Include="DynamicData" Version="7.13.5" />
+    <PackageVersion Include="ReactiveMarbles.Mvvm" Version="1.0.46" />
+    <PackageVersion Include="ReactiveMarbles.PropertyChanged" Version="2.0.27" />
     <PackageVersion Include="System.Reactive" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageVersion Include="coverlet.collector" Version="3.1.2" />
+    <PackageVersion Include="coverlet.collector" Version="3.2.0" />
     <PackageVersion Include="coverlet.msbuild" Version="3.1.2" />
-    <PackageVersion Include="FluentAssertions" Version="6.5.1" />
+    <PackageVersion Include="FluentAssertions" Version="6.10.0" />
     <PackageVersion Include="FluentAssertions.Analyzers" Version="0.16.0" />
-    <PackageVersion Include="ReactiveUI.Testing" Version="17.1.50" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+    <PackageVersion Include="ReactiveUI.Testing" Version="18.4.26" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageVersion Include="xunit" Version="2.4.1" />
+    <PackageVersion Include="xunit" Version="2.4.2" />
     <PackageVersion Include="xunit.analyzers" Version="0.10.0" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.4.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.4.5" />
     <PackageVersion Include="coverlet.collector" Version="3.1.0" />
   </ItemGroup>
   <Import