#7875: Android: Button size changes when setting Accessibility properties (#8368)

* Tryed to reproduce the same correction applied to the default implementation

* Added repro sample

* Fixed build error on iOS

Author: magoolation

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue7875.cs

@@ -0,0 +1,65 @@
+using Xamarin.Forms.Internals;
+using Xamarin.Forms.CustomAttributes;
+
+#if UITEST
+using Xamarin.Forms.Core.UITests;
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+#if UITEST
+	[Category(UITestCategories.Button)]
+#endif
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 7875, "Button size changes when setting Accessibility properties", PlatformAffected.Android)]
+	public class Issue7875 : TestContentPage
+	{
+		public Issue7875()
+		{
+			Title = "Issue 7875";
+
+			var layout = new Grid();
+
+			layout.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
+			layout.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
+			layout.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
+
+			var instructions = new Label
+			{
+				BackgroundColor = Color.Black,
+				TextColor = Color.White,
+				Text = "If the buttons below have the same size, the test has passed."
+			};
+			layout.Children.Add(instructions, 0, 0);
+
+			var button = new Button
+			{
+				BackgroundColor = Color.Gray,
+				HorizontalOptions = LayoutOptions.Center,
+				ImageSource = "calculator.png",
+				Text = "Text"
+			};
+			layout.Children.Add(button, 0, 1);
+
+			var accesibilityButton = new Button
+			{
+				BackgroundColor = Color.Gray,
+				HorizontalOptions = LayoutOptions.Center,
+				ImageSource = "calculator.png",
+				Text = "Text"
+			};
+			accesibilityButton.SetValue(AutomationProperties.NameProperty, "AccesibilityButton");
+			accesibilityButton.SetValue(AutomationProperties.HelpTextProperty, "Help Large Text");
+			layout.Children.Add(accesibilityButton, 0, 2);
+
+			Content = layout;
+		}
+
+		protected override void Init()
+		{
+		
+		}
+	}
+}

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

@@ -1181,6 +1181,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue8672.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue8326.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue8449.xaml.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue7875.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Bugzilla22229.xaml">

Xamarin.Forms.Platform.Android/FastRenderers/AutomationPropertiesProvider.cs

@@ -124,7 +124,7 @@ static bool SetHint(AView Control, BindableObject Element, ref string defaultHin
 				return false;
 			}
 
-			if (Element is Picker)
+			if (Element is Picker || Element is Button)
 			{
 				return false;
 			}

Xamarin.Forms.Platform.Android/FastRenderers/ButtonRenderer.cs

@@ -82,10 +82,26 @@ void IOnFocusChangeListener.OnFocusChange(AView v, bool hasFocus)
 		{
 			((IElementController)Button).SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, hasFocus);
 		}
-
+	
 		SizeRequest IVisualElementRenderer.GetDesiredSize(int widthConstraint, int heightConstraint)
 		{
-			return _buttonLayoutManager.GetDesiredSize(widthConstraint, heightConstraint);
+			if (_isDisposed)
+			{
+				return new SizeRequest();
+			}
+
+			var hint = Control.Hint;
+
+			if (!string.IsNullOrWhiteSpace(hint))
+			{
+				Control.Hint = string.Empty;
+			}
+
+			var result  = _buttonLayoutManager.GetDesiredSize(widthConstraint, heightConstraint);
+
+			Control.Hint = hint;
+
+			return result;
 		}
 
 		void IVisualElementRenderer.SetElement(VisualElement element)