add unit test for #13585 (#16578)

src/Controls/tests/Xaml.UnitTests/Issues/Maui13585.xaml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:d="http://schemas.microsoft.com/dotnet/2021/maui/design"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:local="clr-namespace:Microsoft.Maui.Controls.Xaml.UnitTests"
+             x:Class="Microsoft.Maui.Controls.Xaml.UnitTests.Maui13585">
+    <ContentPage.Resources>
+        <Color x:Key="MyPrimaryColor">Green</Color>
+        <Color x:Key="MyReadOnlyColor">Purple</Color>
+
+        <Style TargetType="Button" x:Key="MyStaticResourceButtonStyle">
+            <Setter Property="BackgroundColor" Value="{StaticResource MyPrimaryColor}" />
+            <Style.Triggers>
+                <Trigger TargetType="Button" Property="IsEnabled" Value="False" >
+                    <Setter Property="BackgroundColor" Value="{StaticResource MyReadOnlyColor}" />
+                </Trigger>
+            </Style.Triggers>
+        </Style>
+
+        <Style TargetType="Button" x:Key="MyDynamicResourceButtonStyle">
+            <Setter Property="BackgroundColor" Value="{DynamicResource MyPrimaryColor}" />
+            <Style.Triggers>
+                <Trigger TargetType="Button" Property="IsEnabled" Value="False" >
+                    <Setter Property="BackgroundColor" Value="{DynamicResource MyReadOnlyColor}" />
+                </Trigger>
+            </Style.Triggers>
+        </Style>
+    </ContentPage.Resources>
+    <StackLayout>
+        <Button x:Name="styleTriggerWithStaticResources" Style="{StaticResource MyStaticResourceButtonStyle}" />
+        <Button x:Name="styleTriggerWithDynamicResources" Style="{StaticResource MyDynamicResourceButtonStyle}" />
+    </StackLayout>
+</ContentPage>

src/Controls/tests/Xaml.UnitTests/Issues/Maui13585.xaml.cs

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+using System;
+using Microsoft.Maui.Graphics;
+using Microsoft.Maui.ApplicationModel;
+using Microsoft.Maui.Controls.Core.UnitTests;
+using Microsoft.Maui.Devices;
+using NUnit.Framework;
+
+
+namespace Microsoft.Maui.Controls.Xaml.UnitTests
+{
+
+
+	public partial class Maui13585 : ContentPage
+	{
+		public Maui13585() => InitializeComponent();
+		public Maui13585(bool useCompiledXaml)
+		{
+			//this stub will be replaced at compile time
+		}
+
+
+
+		[TestFixture]
+		class Tests
+		{
+			[SetUp] public void Setup() => AppInfo.SetCurrent(new MockAppInfo());
+			[TearDown] public void TearDown() => AppInfo.SetCurrent(null);
+
+			[Test]
+			public void TriggerWithDynamicResource([Values(false, true)] bool useCompiledXaml)
+			{
+				var page = new Maui13585(useCompiledXaml);
+				Assert.That(page.styleTriggerWithStaticResources.BackgroundColor, Is.EqualTo(Colors.Green));
+				Assert.That(page.styleTriggerWithDynamicResources.BackgroundColor, Is.EqualTo(Colors.Green));
+
+				page.styleTriggerWithStaticResources.IsEnabled = false;
+				page.styleTriggerWithDynamicResources.IsEnabled = false;
+
+				Assert.That(page.styleTriggerWithStaticResources.BackgroundColor, Is.EqualTo(Colors.Purple));
+				Assert.That(page.styleTriggerWithDynamicResources.BackgroundColor, Is.EqualTo(Colors.Purple));
+
+				page.styleTriggerWithStaticResources.IsEnabled = true;
+				page.styleTriggerWithDynamicResources.IsEnabled = true;
+
+				Assert.That(page.styleTriggerWithStaticResources.BackgroundColor, Is.EqualTo(Colors.Green));
+				Assert.That(page.styleTriggerWithDynamicResources.BackgroundColor, Is.EqualTo(Colors.Green));
+
+			}
+		}
+	}
+}