Xamarin.forms: [Bug]List Items disappears when Xamarin.Forms upgraded to 4.0.0.618610 or later

[gokulsaravanan]

Description

SfListView items disappear when an item is removed and added at the end of the list when GroupHeader is sticky.

Steps to Reproduce

1. Run the attached sample. Scroll to the end of the list.
2. Click the "Add" button.
3. Now scroll SfListView.

Expected Behavior

Items and Group header should not disappear.

Actual Behavior

GroupHeader and random items gets disappeared.

Basic Information

• Version with issue: 4.0.0.618610 or later
• Last known good version: 4.0.0.540366
• IDE: Visual Studio 2019.
  Sample:
  sfListViewBug.zip

[samhouts]

@gokulsaravanan What platform is this occurring on? Thanks!

[gokulsaravanan]

@samhouts Only in android.
Regards
Gokul S

[jfversluis]

When I scroll down, tap the add button a couple of times and scroll back up items are starting to disappear.

[GnanaPriyaNamasivayam]

Can you please update us the current status of this issue?

[GnanaPriyaNamasivayam]

Kindly share the timeline for the reported issue?

[syncsiva]

@samhouts Can this be prioritized since it's affecting the customers using Syncfusion SfListView and it is broken due to recent changes.

[syncsiva]

@samhouts Can you please let us know if you need any more details from Syncfusion side?

[GnanaPriyaNamasivayam]

@samhouts , Kindly share with us in which NuGet release you are planned to include the fix for the bug report. We are waiting very long for this fix?

[jayaleshwari]

@samhouts , Can you please update on this.

[samhouts]

This is on the backlog. I don't currently have an estimate of when we may begin work on this item. Thank you for your patience!

[LakshmiNatarajan21]

@samhouts ,
Could you please update the timeline for this fix?
Thanks.

[gokulsaravanan]

@samhouts,
Could you please provide the timeline for this fix?
Can this be prioritized since it's affecting the customers using Syncfusion SfListView and it is broken due to recent changes.
Thanks.

[samhouts]

@gokulsaravanan I don't have an estimated timeline yet, but I have increased the priority on the backlog. Thanks!

[LakshmiNatarajan21]

@samhouts ,
Can this issue be fixed with high priority? please provide the timeline since we are waiting for a long time for this fix?
Thanks

[jayaleshwari]

@samhouts ,Can this be prioritized since it's affecting the customers using Syncfusion SfListView.

[LakshmiNatarajan21]

@samhouts ,
Could you please update the timeline for this fix?
Thanks.

[syncsiva]

@samhouts We tracked down this issue and it was broken because of the below changes.
https://github.com/xamarin/Xamarin.Forms/pull/6390/files#diff-84d52825ae90ee706c381a7e5148b0a0

[syncsiva]

@samhouts it would be okay, if you can provide overrides to unhook layoutchanged event for us.

[syncsiva]

Below the commit which leads to break.
https://github.com/xamarin/Xamarin.Forms/pull/6390/files

[jfversluis]

That is valuable information @syncsiva, thank you! What makes you think this is the cause?

[syncsiva]

@jfversluis we have debugged with xamarin source and back tracked the changes to find the breaking commit.

[syncsiva]

@samhouts We have copied ScrollViewRenderer and remove specific code to fix this issue in our latest version. Please consider to fix this issue to remove the workaround code we have added.