Scroll to top on iOS 15 devices has glitch or a behaviour different in the 'main' branch respect to '4.0.0' version for expanded items.

[shadowsheep1]

New issue checklist

• I have reviewed the README and documentation
• I have searched existing issues and this is not a duplicate
• I have attempted to reproduce the issue and include an example project.

General information

• IGListKit version: main branch
• iOS version(s): iOS 15
• CocoaPods: 1.11.3
• Xcode version: 13.4.1
• Devices/Simulators affected: iOS 15 powered devices/simulators
• Reproducible in the demo project? (Yes/No): YES
• Related issues: none

Debug information

As a workaround you could disable batchContext.reload(self) on iOS 15, loosing animation updates.

override func didSelectItem(at index: Int) {
    collectionContext?.performBatch(
      animated: true,
      updates: { [weak self] batchContext in
        guard let self = self else { return }
        self.expanded.toggle()
        if #available(iOS 15, *) {
          // do nothing
        } else {
          batchContext.reload(self)
        }
      },
      completion: { [weak self] succeded in
        guard let self = self else { return }
        self.collectionContext?.scroll(
            to: self,
            at: index,
            scrollPosition: .top,
            animated: true
        )
      })
  }

Marslink_Final.zip
Screen Recording 2022-07-05 at 09.05.33.zip