[Windows] Using System.Reactive Increases Package Size

[DeanFaizal]

Description

msix package for a fresh app is 44MB. After adding and using System.Reactive it jumps to 88MB.

Steps to Reproduce

1. Create a File > New MAUI app
2. Update OnCounterClicked

    private void OnCounterClicked(object sender, EventArgs e)
    {
        var source = Observable.Timer(DateTimeOffset.MinValue, TimeSpan.FromSeconds(1)).Timestamp();
        source.Subscribe(x =>
        Application.Current.Dispatcher.Dispatch(() =>
        {
            CounterLabel.Text = x.Timestamp.ToString();
        }));
        SemanticScreenReader.Announce(CounterLabel.Text);
    }

3. Add System.Reactive nuget or the following in csproj:

	<ItemGroup>
	  <PackageReference Include="System.Reactive" Version="5.0.0" />
	</ItemGroup>

4. Build the app in command prompt
   msbuild MauiReactive.sln -restore -p:Configuration=Release
5. Package the app in command prompt
   "C:\Program Files (x86)\Windows Kits\10\App Certification Kit\MakeAppx" pack /v /h SHA256 /d "MauiReactive\bin\Release\net6.0-windows10.0.19041\win10-x64" /p MauiReactive.msix

Expected result: Package size increase is minimal from adding a nuget package
Actual result: Package size increase is very large.

Version with bug

Preview 14 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

net6.0-windows10.0.19041

Did you find any workaround?

No

Relevant log output

No response

[ghost]

We've moved this issue to the Future milestone. This means that it is not going to be worked on for the coming release. We will reassess the issue following the current release and consider this item at that time.

[DeanFaizal]

Here's the difference for added files in the package:

"Accessibility.dll"
"D3DCompiler_47_cor3.dll"
"DirectWriteForwarder.dll"
"Microsoft.VisualBasic.Forms.dll"
"Microsoft.Win32.Registry.AccessControl.dll"
"Microsoft.Win32.SystemEvents.dll"
"PenImc_cor3.dll"
"PresentationCore.dll"
"PresentationFramework.Aero.dll"
"PresentationFramework.Aero2.dll"
"PresentationFramework.AeroLite.dll"
"PresentationFramework.Classic.dll"
"PresentationFramework.dll"
"PresentationFramework.Luna.dll"
"PresentationFramework.Royale.dll"
"PresentationFramework-SystemCore.dll"
"PresentationFramework-SystemData.dll"
"PresentationFramework-SystemDrawing.dll"
"PresentationFramework-SystemXml.dll"
"PresentationFramework-SystemXmlLinq.dll"
"PresentationNative_cor3.dll"
"PresentationUI.dll"
"ReachFramework.dll"
"System.CodeDom.dll"
"System.Configuration.ConfigurationManager.dll"
"System.Design.dll"
"System.Diagnostics.EventLog.dll"
"System.Diagnostics.PerformanceCounter.dll"
"System.DirectoryServices.dll"
"System.Drawing.Common.dll"
"System.Drawing.Design.dll"
"System.IO.Packaging.dll"
"System.Printing.dll"
"System.Reactive.dll"
"System.Resources.Extensions.dll"
"System.Security.Cryptography.Pkcs.dll"
"System.Security.Cryptography.ProtectedData.dll"
"System.Security.Cryptography.Xml.dll"
"System.Security.Permissions.dll"
"System.Threading.AccessControl.dll"
"System.Windows.Controls.Ribbon.dll"
"System.Windows.Extensions.dll"
"System.Windows.Forms.Design.dll"
"System.Windows.Forms.Design.Editors.dll"
"System.Windows.Forms.dll"
"System.Windows.Forms.Primitives.dll"
"System.Windows.Input.Manipulations.dll"
"System.Windows.Presentation.dll"
"System.Xaml.dll"
"UIAutomationClient.dll"
"UIAutomationClientSideProviders.dll"
"UIAutomationProvider.dll"
"UIAutomationTypes.dll"
"vcruntime140_cor3.dll"
"WindowsFormsIntegration.dll"
"wpfgfx_cor3.dll"

These seem to be localization folders:
"cs"
"de"
"es"
"fr"
"it"
"ja"
"ko"
"pl"
"pt-BR"
"ru"
"tr"
"zh-Hans"
"zh-Hant"

Inside each localization folder:
"System.Windows.Input.Manipulations.resources.dll"
"System.Xaml.resources.dll"
"UIAutomationClient.resources.dll"
"UIAutomationClientSideProviders.resources.dll"
"UIAutomationProvider.resources.dll"
"UIAutomationTypes.resources.dll"
"WindowsBase.resources.dll"
"WindowsFormsIntegration.resources.dll"
"Microsoft.VisualBasic.Forms.resources.dll"
"PresentationCore.resources.dll"
"PresentationFramework.resources.dll"
"PresentationUI.resources.dll"
"ReachFramework.resources.dll"
"System.Windows.Controls.Ribbon.resources.dll"
"System.Windows.Forms.Design.resources.dll"
"System.Windows.Forms.Primitives.resources.dll"
"System.Windows.Forms.resources.dll"

[DeanFaizal]

Opened issue on System.Reactive as this is not a MAUI issue: dotnet/reactive#1745

Can we provide some guidance to windows package maintainers for MAUI support before we close this?