[Bug] ShapesAPI-based Circle shape has a border by default in iOS while it doesn't have a border in Android

[knocte]

Description

ShapesAPI-based Circle shape has a border by default in iOS while it doesn't have a border in Android.

Steps to Reproduce

1. Have this code to draw an orange-filled circle:

            let size =  radius * 2.
            let color = (items.ElementAt 0).Color
            let pieCircle =
                Ellipse (
                    HorizontalOptions = LayoutOptions.Center,
                    VerticalOptions = LayoutOptions.Center,
                    HeightRequest = size,
                    WidthRequest = size,
                    Fill = SolidColorBrush color
                )
            gridLayout.Children.Add pieCircle

2. Launch it on Android, and you can see this:

3. Launch the same code in iOS.

Expected Behavior

Circle shouldn't have a border.

Actual Behavior

Circle has a border, like this:

Basic Information

• Version with issue: 4.8.0.121 and 5.0.0.2012.
• Last known good version: n/a
• Platform Target Frameworks:
  • iOS: https://github.com/nblockchain/geewallet/blob/feab7fe09c185f28581b1f965a34405ad3fea257/src/GWallet.Frontend.XF.iOS/GWallet.Frontend.XF.iOS.fsproj
  • Android: https://github.com/nblockchain/geewallet/blob/feab7fe09c185f28581b1f965a34405ad3fea257/src/GWallet.Frontend.XF.Android/GWallet.Frontend.XF.Android.fsproj
• Android Support Library / AndroidX Version: https://github.com/nblockchain/geewallet/blob/feab7fe09c185f28581b1f965a34405ad3fea257/src/GWallet.Frontend.XF.Android/GWallet.Frontend.XF.Android.fsproj
• NuGet Packages: 4.8.0.121 and 5.0.0.2012.
• Affected Devices: tested only in emulators

Environment

=== Visual Studio Community 2019 for Mac ===

Version 8.9.9 (build 3)
Installation UUID: f90aee0b-4f78-4b97-a1b9-ce26f536cd85
	GTK+ 2.24.23 (Raleigh theme)
	Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

	Package version: 612000125

=== Mono Framework MDK ===

Runtime:
	Mono 6.12.0.125 (2020-02/8c552e98bd6) (64-bit)
	Package version: 612000125

=== Roslyn (Language Service) ===

3.9.0-6.21152.10+c10f884b30737542ddd84ca889a4aad9281ce210

=== NuGet ===

Version: 5.8.0.6860

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/5.0.203/Sdks
SDK Versions:
	5.0.203
	5.0.202
	5.0.102
	3.1.409
	3.1.408
	3.1.405
	3.1.302
	3.1.301
	3.1.300
	3.1.200
	3.1.102
	3.1.101
	3.1.100
	3.0.101
	3.0.100
	2.1.701
	2.1.700
	2.1.505
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
	5.0.6
	5.0.5
	5.0.2
	3.1.15
	3.1.14
	3.1.11
	3.1.6
	3.1.5
	3.1.4
	3.1.2
	3.1.1
	3.1.0
	3.0.1
	3.0.0
	2.1.23
	2.1.20
	2.1.19
	2.1.18
	2.1.17
	2.1.16
	2.1.15
	2.1.14
	2.1.13
	2.1.12
	2.1.11
	2.1.9

=== .NET Core 3.1 SDK ===

SDK: 3.1.409

=== Xamarin.Profiler ===

Version: 1.6.15.68
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Apple Developer Tools ===

Xcode 12.5 (18205)
Build 12E262

=== Xamarin.Mac ===

Version: 7.10.0.5 (Visual Studio Community)
Hash: ab40b131d
Branch: xcode12.5
Build date: 2021-04-22 08:56:41-0400

=== Xamarin Designer ===

Version: 16.9.0.324
Hash: b1e216c75
Branch: remotes/origin/d16-9
Build date: 2021-04-16 00:02:50 UTC

=== Xamarin.iOS ===

Version: 14.16.0.5 (Visual Studio Community)
Hash: ab40b131d
Branch: xcode12.5
Build date: 2021-04-22 08:56:42-0400

=== Xamarin.Android ===

Version: 11.2.2.1 (Visual Studio Community)
Commit: xamarin-android/d16-9/877f572
Android SDK: /Users/knocte/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		7.0 (API level 24)
		8.0 (API level 26)
		8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 30.0.4
SDK Build Tools Version: 30.0.2

Build Information: 
Mono: 5e9cb6d
Java.Interop: xamarin/java.interop/d16-9@54f8c24
ProGuard: Guardsquare/proguard/v7.0.1@912d149
SQLite: xamarin/sqlite/3.34.1@daff8f4
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-9@d210f11

=== Microsoft OpenJDK for Mobile ===

Java SDK: /Users/knocte/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.9.0.22
Hash: a391de2
Branch: remotes/origin/dev/bretjohn/readme-tweak~3
Build date: 2021-04-21 21:23:40 UTC

=== Android Device Manager ===

Version: 16.9.0.17
Hash: fc2b3db
Branch: remotes/origin/dev/jmt/d16-9bump~1
Build date: 2021-04-21 21:23:58 UTC

=== Build Information ===

Release ID: 809090003
Git revision: 163d834aa64ba9129e5ef30e49a947ef67bcd809
Build date: 2021-05-06 10:14:43-04
Build branch: release-8.9
Xamarin extensions: 163d834aa64ba9129e5ef30e49a947ef67bcd809

=== Operating System ===

Mac OS X 10.16.0
Darwin 20.4.0 Darwin Kernel Version 20.4.0
    Fri Mar  5 01:14:14 PST 2021
    root:xnu-7195.101.1~3/RELEASE_X86_64 x86_64

Build Logs

n/a

Screenshots

see above

Reproduction Link

Project is open source so you can grab sources here: https://github.com/nblockchain/geewallet/tree/feab7fe09c185f28581b1f965a34405ad3fea257/src

Workaround

Not yet found.