Fixed scroll animation issue

Fixed issue resetting the TabViewItem BindingContext

src/TabView.Sample/Views/CarouselViewGallery.xaml.cs

@@ -10,16 +10,16 @@ namespace TabView.Sample.Views
             InitializeComponent();
         }
 
-        void OnScrollToZeroClicked(object sender, EventArgs e)
+        async void OnScrollToZeroClicked(object sender, EventArgs e)
         {
             bool isAnimated = IsAnimatedScrollToCheckBox.IsChecked;
-            CarouselView.ScrollTo(0, isAnimated);
+            await CarouselView.ScrollToAsync(0, isAnimated);
         }
 
-        void OnScrollToFiveClicked(object sender, EventArgs e)
+        async void OnScrollToFiveClicked(object sender, EventArgs e)
         {
             bool isAnimated = IsAnimatedScrollToCheckBox.IsChecked;
-            CarouselView.ScrollTo(5, isAnimated);
+            await CarouselView.ScrollToAsync(5, isAnimated);
         }
     }
 }

src/Xamarin.Forms.TabView/CarouselView.cs

@@ -168,7 +168,7 @@ namespace Xamarin.Forms.TabView
         public event EventHandler<PositionChangedEventArgs> PositionChanged;
         public event EventHandler<ScrolledEventArgs> Scrolled;
 
-        public async void ScrollTo(int position, bool animated = true)
+        public async Task ScrollToAsync(int position, bool animated = true)
         {
             if (Position == position)
                 return;
@@ -464,7 +464,7 @@ namespace Xamarin.Forms.TabView
                 UpdateViewIndex(_previousView);
             }
         }
-
+               
         void AddOrUpdateCache(int key, View value)
         {
             if (_existingViews == null)
@@ -501,7 +501,8 @@ namespace Xamarin.Forms.TabView
             if (view == null)
                 view = (View)ItemTemplate.CreateContent();
 
-            view.BindingContext = context;
+            if (view.BindingContext == null)
+                view.BindingContext = context;
 
             return view;
         }

src/Xamarin.Forms.TabView/TabView.cs

@@ -730,10 +730,12 @@ namespace Xamarin.Forms.TabView
                 return;
 
             SelectedIndex = newPosition;
-            _contentContainer.ScrollTo(SelectedIndex);
 
-            Device.BeginInvokeOnMainThread(
-                async () => await _tabStripContainerScroll.ScrollToAsync(_tabStripContent.Children[position], ScrollToPosition.MakeVisible, false));
+            Device.BeginInvokeOnMainThread(async () =>
+            {
+                await _contentContainer.ScrollToAsync(SelectedIndex);
+                await _tabStripContainerScroll.ScrollToAsync(_tabStripContent.Children[position], ScrollToPosition.MakeVisible, false);
+            });
 
             if (TabItems.Count > 0)
             {