[Bug] CollectionView unfocuses when CollectionView.Reset is called

[GW-FUB]

Description

Hint: Example project linked

I'm using a custom implementation of the ObservableCollection in my code. I'm using it for a search function. I got an entry in my listview header and when I'm entering text the collection changes according to the search results.

My view:

Since I replaced my listviews with the new collectionview I got a problem:

Whenever I call my ReplaceAll(newItems) method on the collection the entry in the header unfocuses.

Code with my bound items and search:

My ReplaceAll function:

I checked the stack trace from the Entry Unfocused event and it seems to get called every time the collection calls CollectionChanged

0xF in COUB.MainPage.EntrySearch_Unfocused at C:\Users\User\Source\Repos\COUB\COUB\MainPage.xaml.cs:31,17	C#

0x13 in Xamarin.Forms.VisualElement.OnUnfocus at D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1029,23	C#
0x1C in Xamarin.Forms.VisualElement.OnIsFocusedPropertyChanged at D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:1006,5	C#
0x12E in Xamarin.Forms.BindableObject.SetValueActual at D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:463,5	C#
0x17C in Xamarin.Forms.BindableObject.SetValueCore at D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:397,5	C#
0xA in Xamarin.Forms.BindableObject.SetValueCore at D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:339,7	C#
0x4 in Xamarin.Forms.Element.SetValueFromRenderer at D:\a\1\s\Xamarin.Forms.Core\Element.cs:254,4	C#
0x5A in Xamarin.Forms.Platform.iOS.EntryRendererBase<UIKit.UITextField>.OnEditingEnded at D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\EntryRenderer.cs:242,4	C#
0x15 in UIKit.UIControlEventProxy.Activated at /Library/Frameworks/Xamarin.iOS.framework/Versions/14.4.1.3/src/Xamarin.iOS/UIKit/UIControl.cs:38,5	C#
0x13 in ObjCRuntime.Messaging.void_objc_msgSend	C#
0x1D in UIKit.UICollectionView.ReloadData at /Library/Frameworks/Xamarin.iOS.framework/Versions/14.4.1.3/src/Xamarin.iOS/UIKit/UICollectionView.g.cs:736,5	C#
0x77 in Xamarin.Forms.Platform.iOS.ObservableItemsSource.Reload at D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ObservableItemsSource.cs:142,4	C#
0x33 in System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Xamarin.Forms.Platform.iOS.ObservableItemsSource.<Reload>d__30> at /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316,17	C#
0x25 in Xamarin.Forms.Platform.iOS.ObservableItemsSource.Reload	C#
0x18D in Xamarin.Forms.Platform.iOS.ObservableItemsSource.CollectionChanged at D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ObservableItemsSource.cs:129,6	C#
0x33 in System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Xamarin.Forms.Platform.iOS.ObservableItemsSource.<CollectionChanged>d__29> at /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316,17	C#
0x2D in Xamarin.Forms.Platform.iOS.ObservableItemsSource.CollectionChanged	C#
0xAC in Xamarin.Forms.Platform.iOS.ObservableItemsSource.CollectionChanged at D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ObservableItemsSource.cs:108,5	C#
0x33 in System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start<Xamarin.Forms.Platform.iOS.ObservableItemsSource.<CollectionChanged>d__28> at /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:84,17	C#
0x2D in Xamarin.Forms.Platform.iOS.ObservableItemsSource.CollectionChanged	C#
0x1B in System.Collections.ObjectModel.ObservableCollection<string>.OnCollectionChanged at /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/System.ObjectModel/src/System/Collections/ObjectModel/ObservableCollection.cs:263,21	C#

>	0x6B in COUB.ObservableRangeCollection<string>.ReplaceAll at C:\Users\User\Source\Repos\COUB\COUB\ObservableRangeCollection.cs:29,13	C#
0x65 in COUB.MainPageVm.<get_SearchCommand>b__6_0 at C:\Users\User\Source\Repos\COUB\COUB\MainPageVm.cs:25,13	C#
0x7 in Xamarin.Forms.Command.Execute at D:\a\1\s\Xamarin.Forms.Core\Command.cs:112,4	C#
0x12 in COUB.MainPage.EntrySearch_TextChanged at C:\Users\User\Source\Repos\COUB\COUB\MainPage.xaml.cs:20,13	C#
0x13 in Xamarin.Forms.InputView.OnTextChanged at D:\a\1\s\Xamarin.Forms.Core\InputView.cs:98,4	C#
0x12 in Xamarin.Forms.InputView.<>c.<.cctor>b__49_0 at D:\a\1\s\Xamarin.Forms.Core\InputView.cs:9,55	C#
0x12E in Xamarin.Forms.BindableObject.SetValueActual at D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:463,5	C#
0x17C in Xamarin.Forms.BindableObject.SetValueCore at D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:397,5	C#
0x5 in Xamarin.Forms.BindableObject.SetValueCore at D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:343,7	C#
0x4 in Xamarin.Forms.Element.SetValueFromRenderer at D:\a\1\s\Xamarin.Forms.Core\Element.cs:248,4	C#
0x3 in Xamarin.Forms.Element.Xamarin.Forms.IElementController.SetValueFromRenderer at D:\a\1\s\Xamarin.Forms.Core\Element.cs:244,92	C#
0x1B in Xamarin.Forms.Platform.iOS.EntryRendererBase<UIKit.UITextField>.OnEditingChanged at D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\EntryRenderer.cs:225,4	C#
0x15 in UIKit.UIControlEventProxy.Activated at /Library/Frameworks/Xamarin.iOS.framework/Versions/14.4.1.3/src/Xamarin.iOS/UIKit/UIControl.cs:38,5	C#
0x66 in UIKit.UIApplication.UIApplicationMain	C#
0xB in UIKit.UIApplication.Main at /Library/Frameworks/Xamarin.iOS.framework/Versions/14.4.1.3/src/Xamarin.iOS/UIKit/UIApplication.cs:86,4	C#
0x11 in UIKit.UIApplication.Main at /Library/Frameworks/Xamarin.iOS.framework/Versions/14.4.1.3/src/Xamarin.iOS/UIKit/UIApplication.cs:65,5	C#
0x8 in COUB.iOS.Application.Main at C:\Users\User\Source\Repos\COUB\COUB.iOS\Main.cs:17,13	C#

I'm pretty sure this is not exspected and it's really annoying. ListView doesn't have this problem and works as exspected.

Steps to Reproduce

Project: https://github.com/GW-FUB/CollectionView_ObservableCollection_Unfocus_Bug

Expected Behavior

Actual Behavior

Basic Information

• Version with issue: XF 5.0.0.1931
• Platform Target Frameworks:
  • iOS: 14.4 (Simulator)
  • Android: Unknown
• NuGet Packages: XF, XE
• Affected Devices: Simulator, others unknown

[valentasm1]

Any workaround?