App crashes when you clear a group's record in CollectionView

[simon10says]

Description

I've a grouped collectionview that is binded to ObservableCollection. When I Clear() a group of its records and re- Add(), I get IndexOutOfBoundsException as shown below:

Steps to Reproduce

1. Run my repo and you will see the collectionview with 2 groups (Bears and Monkeys)
   

2. Click on the Remove Record toolbar item and the Asian Black Bear record will be removed

3. Click on the Add Record and you will get the IndexOutOfBoundsException

Link to public reproduction project repository

https://github.com/simon10says/maui-CollectionViewGroupBug

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.3 GA

Affected platforms

Android, I was not able test on other platforms

Affected platform versions

No response

Did you find any workaround?

This issue seems to be due to ObservableCollection.Clear(). In my code I Remove Record via:

Animals[0].Clear(); //Animals[0] is the Bears group and this caused the exception when re-add

If I use RemoveAt() instead, I will not get the exception when I re-add the record

while (Animals[0].Count > 0)
{
    Animals[0].RemoveAt(0);
}

Relevant log output

No response

[ninachen03]

I can repro it with 17.10.0 Preview 1.0 on android platform

[r-work]

Can repro with maui 8.0.14

[malsabi]

Is there a clear workaround for this and supports animation when collapsing / expanding ?

[devanathan-vaithiyanathan]

This issue does not reproduce in the maui version (9.0.12) with VSCode 1.94.2 and Android Pixel 8 API 35 (Android 15).

Demo.mov

[dotnet-policy-service]

Hi @simon10says. We have added the "s/try-latest-version" label to this issue, which indicates that we'd like you to try and reproduce this issue on the latest available public version. This can happen because we think that this issue was fixed in a version that has just been released, or the information provided by you indicates that you might be working with an older version.

You can install the latest version by installing the latest Visual Studio (Preview) with the .NET MAUI workload installed. If the issue still persists, please let us know with any additional details and ideally a reproduction project provided through a GitHub repository.

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.