[UWP] Fix ActivityIndicator width in absolutelayout (#3224)

* [Core] Fix autosize elements in absolute layout

* revert the Hasflag extension

* - refactoring to the local UWP fix for Activity Indicator
- fixes #1399

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1399.cs

@@ -0,0 +1,22 @@
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 1399, "ActivityIndicator width is autosize in absolutelayout", PlatformAffected.UWP)]
+	public class Issue1399 : TestContentPage
+	{
+		protected override void Init()
+		{
+			Content = new AbsoluteLayout()
+			{
+				Children = {
+					new Label { Text = "cat", WidthRequest = 0},
+					new Image { Source = "coffee.png", WidthRequest = 0},
+					new ActivityIndicator { IsRunning = true }
+				}
+			};
+		}
+	}
+}

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

@@ -273,6 +273,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue1556.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1799.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1931.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue1399.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue2187.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue3001.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue3271.cs" />

Xamarin.Forms.Platform.UAP/FormsProgressBar.cs

@@ -12,5 +12,12 @@ namespace Xamarin.Forms.Platform.UWP
 			get { return (double)GetValue(ElementOpacityProperty); }
 			set { SetValue(ElementOpacityProperty, value); }
 		}
+
+		protected override Windows.Foundation.Size MeasureOverride(Windows.Foundation.Size availableSize)
+		{
+			var result = base.MeasureOverride(availableSize);
+			result.Width = availableSize.Width;
+			return result;
+		}
 	}
 }