Bug 51536, initial iOS cell layout is incorrect when cell has context…

… actions … (#787)

* Bug 51536, initial height is incorrect when cell has context actions or ListView is in recycle mode

* Improved fix for iOS uneven height cell layout

* Fixed indentation and added test case for issue 44525

* Fixed indentation for test case

* Added 1px room, this will fix Bugzilla31330 test, renamed test case to 51536

* Updated shared project file

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla51536.cs

@@ -0,0 +1,81 @@
+using System.Linq;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 51536, "[iOS] Xamarin.Forms ListView Row Height Does Not Adapt")]
+	public class Bugzilla51536 : TestContentPage
+	{
+		protected override void Init()
+		{
+			const string InstructionsLong = "On iOS, all the list items below will have different height defined by this text, the text " +
+										"should be wrapped and take all cell space. If this text is not wrapped and there is a lot of " +
+										"whitespace in the cell then this test has failed. This error was happening to ListView with RecycleElement mode " +
+										"or when cell has context actions.";
+
+			const string InstructionsShort = "On iOS, all the list items below will have different height defined by this text.";
+
+			var listItems = Enumerable.Range(1, 100).Select(i => new ItemViewModel
+																 {
+																	 Name = "Item" + i,
+																	 Description = i % 2 == 0 ? (InstructionsLong + i) : (InstructionsShort + i)
+																 }).ToArray();
+
+			var listView = new ListView(ListViewCachingStrategy.RecycleElement)
+			{
+				ItemTemplate = new DataTemplate(typeof(ItemViewCell)),
+				HasUnevenRows = true,
+				ItemsSource = listItems
+			};
+
+			Content = listView;
+		}
+	}
+
+	[Preserve(AllMembers = true)]
+	public sealed class ItemViewModel
+	{
+		public string Name { get; set; }
+		public string Description { get; set; }
+	}
+
+	[Preserve(AllMembers = true)]
+	public sealed class ItemViewCell : ViewCell
+	{
+		public Label Label1 { get; set; }
+		public Label Label2 { get; set; }
+
+		public ItemViewCell()
+		{
+			var stackLayout = new StackLayout
+			{
+				Orientation = StackOrientation.Vertical,
+				HorizontalOptions = LayoutOptions.StartAndExpand,
+				VerticalOptions = LayoutOptions.StartAndExpand
+			};
+
+			Label1 = new Label();
+			Label2 = new Label { LineBreakMode = LineBreakMode.WordWrap };
+
+			stackLayout.Children.Add(Label1);
+			stackLayout.Children.Add(Label2);
+
+			View = stackLayout;
+		}
+
+		protected override void OnBindingContextChanged()
+		{
+			base.OnBindingContextChanged();
+
+			var item = BindingContext as ItemViewModel;
+
+			if (item != null)
+			{
+				Label1.Text = item.Name;
+				Label2.Text = item.Description;
+			}
+		}
+	}
+}

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

@@ -142,6 +142,8 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43663.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43735.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44453.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla51536.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44940.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44944.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44166.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44461.cs" />

Xamarin.Forms.Platform.iOS/ContextActionCell.cs

@@ -87,7 +87,8 @@ public override void LayoutSubviews()
 		{
 			base.LayoutSubviews();
 
-			if (_scroller == null || (_scroller != null && _scroller.Frame.Width == ContentView.Bounds.Width))
+			// Leave room for 1px of play because the border is 1 or .5px and must be accounted for.
+			if (_scroller == null || (_scroller.Frame.Width == ContentView.Bounds.Width && Math.Abs(_scroller.Frame.Height - ContentView.Bounds.Height) < 1))
 				return;
 
 			Update(_tableView, _cell, ContentCell);