[Android] Fix crash animate two times the Frame scale

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue13236.xaml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<local:TestContentPage
+    xmlns="http://xamarin.com/schemas/2014/forms"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:d="http://xamarin.com/schemas/2014/forms/design"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Title="Test 13236" xmlns:local="using:Xamarin.Forms.Controls"
+    x:Class="Xamarin.Forms.Controls.Issues.Issue13236">
+    <StackLayout>
+        <Label
+            Padding="12"
+            BackgroundColor="Black"
+            TextColor="White"
+            Text="Tap the button. Without exceptions, the test has passed."/>
+        <Frame
+            x:Name="TheFrame" BackgroundColor="#2196F3"
+            Padding="24" CornerRadius="0">
+            <Label
+                Text="Issue 13236" HorizontalTextAlignment="Center"
+                TextColor="White" FontSize="36"/>
+        </Frame>
+        <Button 
+            Text="Animate"
+            Clicked="OnButtonClicked"/>
+    </StackLayout>
+</local:TestContentPage>

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue13236.xaml.cs

@@ -0,0 +1,40 @@
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Windows.Input;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+using Xamarin.Forms.Core.UITests;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 13236,
+		"[Bug] ScaleTo IllegalArgumentException (Android only)",
+		PlatformAffected.Android)]
+	public partial class Issue13236 : TestContentPage
+	{
+		public Issue13236()
+		{
+#if APP
+			InitializeComponent();
+#endif
+		}
+
+		protected override void Init()
+		{
+		}
+
+#if APP
+		async void OnButtonClicked(System.Object sender, System.EventArgs e)
+		{
+			await TheFrame.ScaleTo(0.2, 0);
+			await TheFrame.ScaleTo(0.2, 0);
+		}
+#endif
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -1791,6 +1791,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue11795.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue14528.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue14286.xaml.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue13236.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue14613.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue13930.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue11211.xaml.cs" />
@@ -2278,6 +2279,9 @@
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue14286.xaml">
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>
+    <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue13236.xaml">
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue14613.xaml">
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>

Xamarin.Forms.Platform.Android/VisualElementTracker.cs

@@ -424,8 +424,13 @@ void UpdateScale()
 			VisualElement view = _renderer.Element;
 			AView aview = _renderer.View;
 
-			aview.ScaleX = (float)view.Scale * (float)view.ScaleX;
-			aview.ScaleY = (float)view.Scale * (float)view.ScaleY;
+			var scale = view.Scale;
+
+			if (double.IsNaN(scale))
+				return;
+
+			aview.ScaleX = (float)scale * (float)view.ScaleX;
+			aview.ScaleY = (float)scale * (float)view.ScaleY;
 		}
 
 		void UpdateTranslationX()