SwipeItemView won't render FontImageSource on first opening - fix (dotnet#25397)

Author: kubaflo

src/Controls/tests/TestCases.Android.Tests/snapshots/android/ItemImageSourceShouldBeVisible.png

@@ -0,0 +1,64 @@
+<?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"
+             x:Class="Maui.Controls.Sample.Issues.Issue18806"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+    <Grid RowDefinitions="*,Auto">
+        <VerticalStackLayout>
+            <SwipeView x:Name="swipeView1"
+                       Threshold="100">
+                <SwipeView.RightItems>
+                    <SwipeItems>
+                        <SwipeItemView BackgroundColor="Black">
+                            <Image
+                                HorizontalOptions="Center"
+                                WidthRequest="10"
+                                VerticalOptions="Center">
+                                <Image.Source>
+                                    <FontImageSource Color="White"
+                                                     Glyph="A"/>
+                                </Image.Source>
+                            </Image>
+                        </SwipeItemView>
+                    </SwipeItems>
+                </SwipeView.RightItems>
+
+                <SwipeItemView>
+                    <Label HeightRequest="200"
+                           VerticalTextAlignment="Center"
+                           Text="Swipe view 1"/>
+                </SwipeItemView>
+            </SwipeView>
+
+            <SwipeView x:Name="swipeView2"
+                       Threshold="100">
+                <SwipeView.LeftItems>
+                    <SwipeItems>
+                        <SwipeItemView BackgroundColor="Black">
+                            <Image
+                                HorizontalOptions="Center"
+                                WidthRequest="10"
+                                VerticalOptions="Center">
+                                <Image.Source>
+                                    <FontImageSource Color="White"
+                                                     Glyph="A"/>
+                                </Image.Source>
+                            </Image>
+                        </SwipeItemView>
+                    </SwipeItems>
+                </SwipeView.LeftItems>
+
+                <SwipeItemView>
+                    <Label HeightRequest="200"
+                           VerticalTextAlignment="Center"
+                           Text="Swipe view 2"/>
+                </SwipeItemView>
+            </SwipeView>
+        </VerticalStackLayout>
+
+        <Button Grid.Row="1"
+            AutomationId="button"
+                Text="Open SwipeViews"
+                Clicked="Button_Clicked"/>
+    </Grid>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue18806.xaml

@@ -0,0 +1,19 @@
+using System.ComponentModel;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 18806, "SwipeItemView won't render FontImageSource on first opening", PlatformAffected.Android)]
+	public partial class Issue18806 : ContentPage
+	{
+		public Issue18806()
+		{
+			InitializeComponent();
+		}
+
+		private void Button_Clicked(object sender, EventArgs e)
+		{
+			swipeView1.Open(OpenSwipeItem.RightItems, false);
+			swipeView2.Open(OpenSwipeItem.LeftItems, false);
+		}
+	}
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue18806.xaml.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue18806 : _IssuesUITest
+{
+	public Issue18806(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	public override string Issue => "SwipeItemView won't render FontImageSource on first opening";
+	
+	[Test]
+	[Category(UITestCategories.SwipeView)]
+	public void ItemImageSourceShouldBeVisible()
+	{
+		App.WaitForElement("button");
+		App.Tap("button");
+
+		VerifyScreenshot();
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18806.cs

@@ -76,6 +76,16 @@ protected override void OnAttachedToWindow()
 				_viewPagerParent = Control.Parent.GetParentOfType<SwipeViewPager>();
 		}
 
+		protected override void OnLayout(bool changed, int left, int top, int right, int bottom)
+		{
+				base.OnLayout(changed, left, top, right, bottom);
+
+				if (_contentView is null || _actionView is null || GetNativeSwipeItems() is not {Count: > 0} swipeItems)
+					return;
+
+				LayoutSwipeItems(swipeItems);
+		}
+
 		public override bool OnTouchEvent(MotionEvent? e)
 		{
 			base.OnTouchEvent(e);

src/Controls/tests/TestCases.iOS.Tests/snapshots/ios/ItemImageSourceShouldBeVisible.png

@@ -63,6 +63,7 @@ override Microsoft.Maui.Handlers.HybridWebViewHandler.DisconnectHandler(Android.
 override Microsoft.Maui.Platform.MauiAppCompatEditText.OnSelectionChanged(int selStart, int selEnd) -> void
 override Microsoft.Maui.Platform.MauiHybridWebViewClient.Dispose(bool disposing) -> void
 override Microsoft.Maui.Platform.MauiHybridWebViewClient.ShouldInterceptRequest(Android.Webkit.WebView? view, Android.Webkit.IWebResourceRequest? request) -> Android.Webkit.WebResourceResponse?
+override Microsoft.Maui.Platform.MauiSwipeView.OnLayout(bool changed, int left, int top, int right, int bottom) -> void
 override Microsoft.Maui.Platform.MauiWebViewClient.OnRenderProcessGone(Android.Webkit.WebView? view, Android.Webkit.RenderProcessGoneDetail? detail) -> bool
 static Microsoft.Maui.ElementHandlerExtensions.GetRequiredService<T>(this Microsoft.Maui.IElementHandler! handler, System.Type! type) -> T
 static Microsoft.Maui.ElementHandlerExtensions.GetRequiredService<T>(this Microsoft.Maui.IElementHandler! handler) -> T