Fixed long secure notes edition scrolling when focused issue (#1257) (#1601)

* Fixed long secure notes edition scrolling when focused issue (#1257)

* Improved fix long secure notes edition scrolling when focused issue to not use a new editor custom renderer but an effect (#1257)

* Fixed long editor, on text and notes on send when scrolling when focused issue (#1257)

src/App/Behaviors/EditorPreventAutoBottomScrollingOnFocusedBehavior.cs

@@ -0,0 +1,43 @@
+using Xamarin.Essentials;
+using Xamarin.Forms;
+
+namespace Bit.App.Behaviors
+{
+    /// <summary>
+    /// This behavior prevents the Editor to be automatically scrolled to the bottom on focus.
+    /// This is needed due to this Xamarin Forms issue: https://github.com/xamarin/Xamarin.Forms/issues/2233
+    /// </summary>
+    public class EditorPreventAutoBottomScrollingOnFocusedBehavior : Behavior<Editor>
+    {
+        public static readonly BindableProperty ParentScrollViewProperty
+            = BindableProperty.Create(nameof(ParentScrollView), typeof(ScrollView), typeof(EditorPreventAutoBottomScrollingOnFocusedBehavior));
+
+        public ScrollView ParentScrollView
+        {
+            get => (ScrollView)GetValue(ParentScrollViewProperty);
+            set => SetValue(ParentScrollViewProperty, value);
+        }
+
+        protected override void OnAttachedTo(Editor bindable)
+        {
+            base.OnAttachedTo(bindable);
+
+            bindable.Focused += OnFocused;
+        }
+
+        private void OnFocused(object sender, FocusEventArgs e)
+        {
+            if (DeviceInfo.Platform.Equals(DevicePlatform.iOS) && ParentScrollView != null)
+            {
+                ParentScrollView.ScrollToAsync(ParentScrollView.ScrollX, ParentScrollView.ScrollY, true);
+            }
+        }
+
+        protected override void OnDetachingFrom(Editor bindable)
+        {
+            bindable.Focused -= OnFocused;
+
+            base.OnDetachingFrom(bindable);
+        }
+    }
+}