[iOS]Fix for Character Spacing Not Updating Correctly in Editor for Dynamically Added Text

src/Controls/src/Core/Editor/Editor.iOS.cs

@@ -9,6 +9,9 @@ public static void MapText(EditorHandler handler, Editor editor) =>
 		public static void MapText(IEditorHandler handler, Editor editor)
 		{
 			Platform.TextExtensions.UpdateText(handler.PlatformView, editor);
+
+			// Any text changes in the editor field require recalculating the CharacterSpacing by regenerating the attributed string to properly apply the spacing and override the current text formatting.
+			handler?.UpdateValue(nameof(CharacterSpacing));
 		}
 	}
 }

src/Controls/tests/TestCases.HostApp/Issues/Issue17782.xaml

@@ -0,0 +1,65 @@
+<?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.Issue17782"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues"
+             Title="Issue 17782">
+
+  <VerticalStackLayout x:Name="verticalStack" Spacing="10">
+
+    <!-- Case 1: Add text to the editor with initial CharacterSpacing set to 10.
+         The Button click updates the text to a predefined value. -->
+    <Editor x:Name="initialCharacterSpacingEditor" 
+            AutomationId="InitialCharacterSpacingEditor" 
+            CharacterSpacing="10"
+            HeightRequest="60"/>
+
+    <Button x:Name="buttonAddEditorText" 
+            AutomationId="ButtonAddEditorText"
+            Text="Click to Add Editor Text" 
+            Clicked="OnAddEditorTextClicked" 
+            HorizontalOptions="Fill" />
+
+    <!-- Case 2: Update CharacterSpacing of the editor programmatically.
+         Initially, the CharacterSpacing is not set, and upon clicking the button, it is updated to 10. -->
+    <Editor x:Name="dynamicCharacterSpacingEditor" 
+            AutomationId="DynamicCharacterSpacingEditor"
+            HeightRequest="60" />
+
+    <Button x:Name="buttonUpdateCharacterSpacing" 
+            AutomationId="ButtonUpdateCharacterSpacing"
+            Text="Update Dynamic Character Spacing"
+            Clicked="OnUpdateCharacterSpacingClicked" />
+
+    <!-- Case 3: Reset CharacterSpacing of the editor to zero.
+         Initially, the CharacterSpacing is set to 10, and the Button click resets it to 0. -->
+    <Editor x:Name="resetCharacterSpacingEditor" 
+            AutomationId="ResetCharacterSpacingEditor" 
+            CharacterSpacing="10" 
+            HeightRequest="60" />
+
+    <Button x:Name="buttonResetCharacterSpacing" 
+            AutomationId="ButtonResetCharacterSpacing"
+            Text="Reset Character Spacing" 
+            Clicked="OnResetCharacterSpacingClicked" />
+
+    <!-- Case 4: Bind CharacterSpacing of the editor to a Slider's value.
+         The Slider allows dynamic adjustment of the editor's CharacterSpacing in real-time. -->
+    <Editor x:Name="editorWithSlider" 
+            AutomationId="EditorWithSlider" 
+            Text="Editor" 
+            CharacterSpacing="{Binding Value}" 
+            BindingContext="{x:Reference Slider}" />
+
+    <Slider x:Name="Slider" 
+            AutomationId="SliderCharacterSpacing"
+            Minimum="0"
+            Maximum="30"
+            Value="10" />
+
+     <Button AutomationId="EditorsUnfocusButton"
+             Text="Set Editors Unfocus" 
+             Clicked="OnEditorsUnfocusButtonClicked" />
+  </VerticalStackLayout>
+
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue17782.xaml.cs

@@ -0,0 +1,39 @@
+using System.Collections.ObjectModel;
+
+namespace Maui.Controls.Sample.Issues
+{
+
+	[Issue(IssueTracker.Github, 17782, "[ManualMauiTests] New text in the Editor character spacing test sometimes uses the previous spacing", PlatformAffected.iOS)]
+	public partial class Issue17782 : ContentPage
+	{
+
+		public Issue17782()
+		{
+			InitializeComponent();
+		}
+
+		private void OnAddEditorTextClicked(object sender, EventArgs e)
+		{
+			initialCharacterSpacingEditor.Text = "Initial CharacterSpacing with Text";
+		}
+
+		private void OnUpdateCharacterSpacingClicked(object sender, EventArgs e)
+		{
+			dynamicCharacterSpacingEditor.CharacterSpacing = 10;
+		}
+
+		private void OnResetCharacterSpacingClicked(object sender, EventArgs e)
+		{
+			resetCharacterSpacingEditor.CharacterSpacing = 0;
+		}
+
+		private void OnEditorsUnfocusButtonClicked(object sender, EventArgs e)
+		{
+			foreach(var child in verticalStack.Children) 
+			{
+				if(child is Editor editor)
+					editor.Unfocus();
+			}
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue17782.cs

@@ -0,0 +1,33 @@
+#if !MACCATALYST
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue17782 : _IssuesUITest
+{
+	public Issue17782(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	public override string Issue => "[ManualMauiTests] New text in the Editor character spacing test sometimes uses the previous spacing";
+
+	[Test]
+	[Category(UITestCategories.Editor)]
+	public void VerifyEditorCharacterSpacingWithText()
+	{
+		App.WaitForElement("SliderCharacterSpacing");
+		App.Click("ButtonAddEditorText");
+		App.Click("ButtonUpdateCharacterSpacing");
+		App.EnterText("DynamicCharacterSpacingEditor", "Text");
+		App.Click("ButtonResetCharacterSpacing");
+		App.EnterText("ResetCharacterSpacingEditor", "Text");
+		App.Click("EditorsUnfocusButton");
+#if IOS
+		App.DismissKeyboard();
+#endif
+		VerifyScreenshot();
+	}
+}
+#endif