WIP3

src/Core/src/Handlers/Element/ElementHandler.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 
 namespace Microsoft.Maui.Handlers
 {
@@ -41,9 +40,7 @@ public virtual void SetVirtualView(IElement view)
 			_ = view ?? throw new ArgumentNullException(nameof(view));
 
 			if (VirtualView == view)
-			{
 				return;
-			}
 
 			var oldVirtualView = VirtualView;
 
@@ -59,18 +56,14 @@ public virtual void SetVirtualView(IElement view)
 			}
 
 			if (VirtualView.Handler != this)
-			{
 				VirtualView.Handler = this;
-			}
 
 			// We set the previous virtual view to null after setting it on the incoming virtual view.
 			// This makes it easier for the incoming virtual view to have influence
 			// on how the exchange of handlers happens.
 			// We will just set the handler to null ourselves as a last resort cleanup
 			if (oldVirtualView?.Handler != null)
-			{
 				oldVirtualView.Handler = null;
-			}
 
 			if (setupPlatformView)
 			{

src/Core/src/Handlers/IElementHandler.cs

@@ -6,49 +6,49 @@
 	/// </summary>
 	public interface IElementHandler
 	{
-		/// <summary>
+		/// <summary>  
 		/// Sets the .NET MAUI context for the element handler.  
-		/// </summary>
-		/// <param name="mauiContext">The .NET MAUI context to set.</param>
+		/// </summary>  
+		/// <param name="mauiContext">The .NET MAUI context to set.</param>  
 		void SetMauiContext(IMauiContext mauiContext);
 
-		/// <summary>
+		/// <summary>  
 		/// Sets the cross-platform virtual view associated with the handler.  
-		/// </summary>
-		/// <param name="view">The element to handle.</param>
+		/// </summary>  
+		/// <param name="view">The element to handle.</param>  
 		void SetVirtualView(IElement view);
 
-		/// <summary>
-		/// Updates the value of the specified property on the handler.
-		/// </summary>
-		/// <param name="property">The name of the property to update.</param>
+		/// <summary>  
+		/// Updates the value of the specified property on the handler.  
+		/// </summary>  
+		/// <param name="property">The name of the property to update.</param>  
 		void UpdateValue(string property);
 
-		/// <summary>
-		/// Invokes the specified command on the element with the given arguments.
-		/// </summary>
-		/// <param name="command">The name of the command to invoke.</param>
-		/// <param name="args">Optional arguments to pass to the command.</param>
+		/// <summary>  
+		/// Invokes the specified command on the element with the given arguments.  
+		/// </summary>  
+		/// <param name="command">The name of the command to invoke.</param>  
+		/// <param name="args">Optional arguments to pass to the command.</param>  
 		void Invoke(string command, object? args = null);
 
-		/// <summary>
+		/// <summary>  
 		/// Disconnects the element handler from the element for clean up.  
-		/// </summary>
+		/// </summary>  
 		void DisconnectHandler();
 
-		/// <summary>
-		/// Gets the platform-specific view object associated with the handler.
-		/// </summary>
+		/// <summary>  
+		/// Gets the platform-specific view object associated with the handler.  
+		/// </summary>  
 		object? PlatformView { get; }
 
-		/// <summary>
-		/// Gets the cross-platform virtual view associated with the handler.
-		/// </summary>
+		/// <summary>  
+		/// Gets the cross-platform virtual view associated with the handler.  
+		/// </summary>  
 		IElement? VirtualView { get; }
 
-		/// <summary>
-		/// Gets the .NET MAUI context associated with the element.
-		/// </summary>
+		/// <summary>  
+		/// Gets the .NET MAUI context associated with the element.  
+		/// </summary>  
 		IMauiContext? MauiContext { get; }
 	}
 }

src/Core/src/Handlers/Label/LabelHandler.cs

@@ -19,10 +19,10 @@ public partial class LabelHandler : ILabelHandler
 	{
 		static LabelHandler()
 		{
-			initSkipChecks.Add(nameof(ILabel.CharacterSpacing), SkipCheckCharacterSpacing);
-			initSkipChecks.Add(nameof(ILabel.HorizontalTextAlignment), SkipCheckHorizontalTextAlignment);
-			initSkipChecks.Add(nameof(ILabel.VerticalTextAlignment), SkipCheckVerticalTextAlignment);
-			initSkipChecks.Add(nameof(ILabel.TextDecorations), SkipCheckTextDecorations);
+			initSkipChecks[nameof(ILabel.CharacterSpacing)] = SkipCheckCharacterSpacing;
+			initSkipChecks[nameof(ILabel.HorizontalTextAlignment)] = SkipCheckHorizontalTextAlignment;
+			initSkipChecks[nameof(ILabel.VerticalTextAlignment)] = SkipCheckVerticalTextAlignment;
+			initSkipChecks[nameof(ILabel.TextDecorations)] = SkipCheckTextDecorations;
 		}
 
 		public static IPropertyMapper<ILabel, ILabelHandler> Mapper = new PropertyMapper<ILabel, ILabelHandler>(initSkipChecks, ViewHandler.ViewMapper)

src/Core/src/Handlers/View/ViewHandler.cs

@@ -207,7 +207,7 @@ public virtual bool NeedsContainer
 		}
 
 		/// <summary>
-		/// Gets or sets the .NET MAUI representation of the view associated to this handler.
+		/// Gets or sets the .NET MAUI repesentation of the view associated to this handler.
 		/// </summary>
 		/// <remarks>This property holds the reference to the abstract (.NET MAUI) view.
 		/// The platform view is found in <see cref="PlatformView"/>.</remarks>

src/Core/src/PropertyMapper.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 #if IOS || MACCATALYST
 using PlatformView = UIKit.UIView;
@@ -54,9 +53,7 @@ protected virtual void SetPropertyCore(string key, Action<IElementHandler, IElem
 		protected virtual void UpdatePropertyCore(string key, IElementHandler viewHandler, IElement virtualView)
 		{
 			if (!viewHandler.CanInvokeMappers())
-			{
 				return;
-			}
 
 			var action = GetProperty(key);
 			action?.Invoke(viewHandler, virtualView);
@@ -89,19 +86,14 @@ public virtual Func<IElement, bool> GetSkipCheck(string key)
 		public virtual Action<IElementHandler, IElement>? GetProperty(string key)
 		{
 			if (_mapper.TryGetValue(key, out var action))
-			{
 				return action;
-			}
 			else if (Chained is not null)
 			{
 				foreach (var ch in Chained)
 				{
 					var returnValue = ch.GetProperty(key);
-
 					if (returnValue != null)
-					{
 						return returnValue;
-					}
 				}
 			}
 
@@ -111,20 +103,20 @@ public virtual Func<IElement, bool> GetSkipCheck(string key)
 		public void UpdateProperty(IElementHandler viewHandler, IElement? virtualView, string property)
 		{
 			if (virtualView == null)
-			{
 				return;
-			}
 
 			UpdatePropertyCore(property, viewHandler, virtualView);
 		}
 
+		public void UpdateProperties(IElementHandler viewHandler, IElement? virtualView)
+			=> UpdateProperties(viewHandler, virtualView, false);
+
 #pragma warning disable RS0016 // Add public types and members to the declared API
-		public void UpdateProperties(IElementHandler viewHandler, IElement? virtualView, bool initial = false)
+		public void UpdateProperties(IElementHandler viewHandler, IElement? virtualView, bool initial)
+#pragma warning restore RS0016 // Add public types and members to the declared API
 		{
 			if (virtualView == null)
-			{
 				return;
-			}
 
 			foreach (var key in UpdateKeys)
 			{
@@ -141,7 +133,6 @@ public void UpdateProperties(IElementHandler viewHandler, IElement? virtualView,
 				UpdatePropertyCore(key, viewHandler, virtualView);
 			}
 		}
-#pragma warning restore RS0016 // Add public types and members to the declared API
 
 		public IPropertyMapper[]? Chained
 		{
@@ -193,8 +184,11 @@ public interface IPropertyMapper
 		Action<IElementHandler, IElement>? GetProperty(string key);
 
 		IEnumerable<string> GetKeys();
+		void UpdateProperties(IElementHandler elementHandler, IElement virtualView);
 
-		void UpdateProperties(IElementHandler elementHandler, IElement virtualView, bool initial = false);
+#pragma warning disable RS0016 // Add public types and members to the declared API
+		void UpdateProperties(IElementHandler elementHandler, IElement virtualView, bool initial);
+#pragma warning restore RS0016 // Add public types and members to the declared API
 
 		void UpdateProperty(IElementHandler elementHandler, IElement virtualView, string property);
 	}
@@ -240,9 +234,7 @@ public void Add(string key, Action<TViewHandler, TVirtualView> action) =>
 			SetPropertyCore(key, (h, v) =>
 			{
 				if (v is TVirtualView vv)
-				{
 					action?.Invoke((TViewHandler)h, vv);
-				}
 				else if (Chained != null)
 				{
 					foreach (var chain in Chained)

src/Core/src/PublicAPI/net-android/PublicAPI.Shipped.txt

@@ -1110,6 +1110,7 @@ Microsoft.Maui.IProgress.ProgressColor.get -> Microsoft.Maui.Graphics.Color!
 Microsoft.Maui.IPropertyMapper
 Microsoft.Maui.IPropertyMapper.GetKeys() -> System.Collections.Generic.IEnumerable<string!>!
 Microsoft.Maui.IPropertyMapper.GetProperty(string! key) -> System.Action<Microsoft.Maui.IElementHandler!, Microsoft.Maui.IElement!>?
+Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView) -> void
 Microsoft.Maui.IPropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, string! property) -> void
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void
@@ -1875,6 +1876,7 @@ Microsoft.Maui.PropertyMapper.Chained.get -> Microsoft.Maui.IPropertyMapper![]?
 Microsoft.Maui.PropertyMapper.Chained.set -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper() -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper(params Microsoft.Maui.IPropertyMapper![]? chained) -> void
+Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView) -> void
 Microsoft.Maui.PropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView, string! property) -> void
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void

src/Core/src/PublicAPI/net-android/PublicAPI.Unshipped.txt

@@ -35,7 +35,6 @@ Microsoft.Maui.IHybridWebView.InvokeJavaScriptType.set -> void
 Microsoft.Maui.IHybridWebView.RawMessageReceived(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SendRawMessage(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SetInvokeJavaScriptTarget<T>(T! target) -> void
-Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, bool initial = false) -> void
 Microsoft.Maui.ITitleBar
 Microsoft.Maui.ITitleBar.PassthroughElements.get -> System.Collections.Generic.IList<Microsoft.Maui.IView!>!
 Microsoft.Maui.ITitleBar.Subtitle.get -> string?

src/Core/src/PublicAPI/net-ios/PublicAPI.Shipped.txt

@@ -1074,6 +1074,7 @@ Microsoft.Maui.IProgress.ProgressColor.get -> Microsoft.Maui.Graphics.Color!
 Microsoft.Maui.IPropertyMapper
 Microsoft.Maui.IPropertyMapper.GetKeys() -> System.Collections.Generic.IEnumerable<string!>!
 Microsoft.Maui.IPropertyMapper.GetProperty(string! key) -> System.Action<Microsoft.Maui.IElementHandler!, Microsoft.Maui.IElement!>?
+Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView) -> void
 Microsoft.Maui.IPropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, string! property) -> void
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void
@@ -1792,6 +1793,7 @@ Microsoft.Maui.PropertyMapper.Chained.get -> Microsoft.Maui.IPropertyMapper![]?
 Microsoft.Maui.PropertyMapper.Chained.set -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper() -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper(params Microsoft.Maui.IPropertyMapper![]? chained) -> void
+Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView) -> void
 Microsoft.Maui.PropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView, string! property) -> void
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void

src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt

@@ -35,7 +35,6 @@ Microsoft.Maui.IHybridWebView.InvokeJavaScriptType.set -> void
 Microsoft.Maui.IHybridWebView.RawMessageReceived(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SendRawMessage(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SetInvokeJavaScriptTarget<T>(T! target) -> void
-Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, bool initial = false) -> void
 Microsoft.Maui.ITitleBar
 Microsoft.Maui.ITitleBar.PassthroughElements.get -> System.Collections.Generic.IList<Microsoft.Maui.IView!>!
 Microsoft.Maui.ITitleBar.Subtitle.get -> string?

src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Shipped.txt

@@ -1074,6 +1074,7 @@ Microsoft.Maui.IProgress.ProgressColor.get -> Microsoft.Maui.Graphics.Color!
 Microsoft.Maui.IPropertyMapper
 Microsoft.Maui.IPropertyMapper.GetKeys() -> System.Collections.Generic.IEnumerable<string!>!
 Microsoft.Maui.IPropertyMapper.GetProperty(string! key) -> System.Action<Microsoft.Maui.IElementHandler!, Microsoft.Maui.IElement!>?
+Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView) -> void
 Microsoft.Maui.IPropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, string! property) -> void
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void
@@ -1791,6 +1792,7 @@ Microsoft.Maui.PropertyMapper.Chained.get -> Microsoft.Maui.IPropertyMapper![]?
 Microsoft.Maui.PropertyMapper.Chained.set -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper() -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper(params Microsoft.Maui.IPropertyMapper![]? chained) -> void
+Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView) -> void
 Microsoft.Maui.PropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView, string! property) -> void
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void

src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt

@@ -35,7 +35,6 @@ Microsoft.Maui.IHybridWebView.InvokeJavaScriptType.set -> void
 Microsoft.Maui.IHybridWebView.RawMessageReceived(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SendRawMessage(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SetInvokeJavaScriptTarget<T>(T! target) -> void
-Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, bool initial = false) -> void
 Microsoft.Maui.ITitleBar
 Microsoft.Maui.ITitleBar.PassthroughElements.get -> System.Collections.Generic.IList<Microsoft.Maui.IView!>!
 Microsoft.Maui.ITitleBar.Subtitle.get -> string?

src/Core/src/PublicAPI/net-windows/PublicAPI.Shipped.txt

@@ -1085,6 +1085,7 @@ Microsoft.Maui.IProgress.ProgressColor.get -> Microsoft.Maui.Graphics.Color!
 Microsoft.Maui.IPropertyMapper
 Microsoft.Maui.IPropertyMapper.GetKeys() -> System.Collections.Generic.IEnumerable<string!>!
 Microsoft.Maui.IPropertyMapper.GetProperty(string! key) -> System.Action<Microsoft.Maui.IElementHandler!, Microsoft.Maui.IElement!>?
+Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView) -> void
 Microsoft.Maui.IPropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, string! property) -> void
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void
@@ -1747,6 +1748,7 @@ Microsoft.Maui.PropertyMapper.Chained.get -> Microsoft.Maui.IPropertyMapper![]?
 Microsoft.Maui.PropertyMapper.Chained.set -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper() -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper(params Microsoft.Maui.IPropertyMapper![]? chained) -> void
+Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView) -> void
 Microsoft.Maui.PropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView, string! property) -> void
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void

src/Core/src/PublicAPI/net-windows/PublicAPI.Unshipped.txt

@@ -35,7 +35,6 @@ Microsoft.Maui.IHybridWebView.InvokeJavaScriptType.set -> void
 Microsoft.Maui.IHybridWebView.RawMessageReceived(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SendRawMessage(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SetInvokeJavaScriptTarget<T>(T! target) -> void
-Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, bool initial = false) -> void
 Microsoft.Maui.ITitleBar
 Microsoft.Maui.ITitleBar.PassthroughElements.get -> System.Collections.Generic.IList<Microsoft.Maui.IView!>!
 Microsoft.Maui.ITitleBar.Subtitle.get -> string?

src/Core/src/PublicAPI/net/PublicAPI.Shipped.txt

@@ -1043,6 +1043,7 @@ Microsoft.Maui.IProgress.ProgressColor.get -> Microsoft.Maui.Graphics.Color!
 Microsoft.Maui.IPropertyMapper
 Microsoft.Maui.IPropertyMapper.GetKeys() -> System.Collections.Generic.IEnumerable<string!>!
 Microsoft.Maui.IPropertyMapper.GetProperty(string! key) -> System.Action<Microsoft.Maui.IElementHandler!, Microsoft.Maui.IElement!>?
+Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView) -> void
 Microsoft.Maui.IPropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, string! property) -> void
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.IPropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void
@@ -1536,6 +1537,7 @@ Microsoft.Maui.PropertyMapper.Chained.get -> Microsoft.Maui.IPropertyMapper![]?
 Microsoft.Maui.PropertyMapper.Chained.set -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper() -> void
 Microsoft.Maui.PropertyMapper.PropertyMapper(params Microsoft.Maui.IPropertyMapper![]? chained) -> void
+Microsoft.Maui.PropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView) -> void
 Microsoft.Maui.PropertyMapper.UpdateProperty(Microsoft.Maui.IElementHandler! viewHandler, Microsoft.Maui.IElement? virtualView, string! property) -> void
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>
 Microsoft.Maui.PropertyMapper<TVirtualView, TViewHandler>.Add(string! key, System.Action<TViewHandler, TVirtualView>! action) -> void

src/Core/src/PublicAPI/net/PublicAPI.Unshipped.txt

@@ -35,7 +35,6 @@ Microsoft.Maui.IHybridWebView.InvokeJavaScriptType.set -> void
 Microsoft.Maui.IHybridWebView.RawMessageReceived(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SendRawMessage(string! rawMessage) -> void
 Microsoft.Maui.IHybridWebView.SetInvokeJavaScriptTarget<T>(T! target) -> void
-Microsoft.Maui.IPropertyMapper.UpdateProperties(Microsoft.Maui.IElementHandler! elementHandler, Microsoft.Maui.IElement! virtualView, bool initial = false) -> void
 Microsoft.Maui.ITitleBar
 Microsoft.Maui.ITitleBar.PassthroughElements.get -> System.Collections.Generic.IList<Microsoft.Maui.IView!>!
 Microsoft.Maui.ITitleBar.Subtitle.get -> string?