Description

The WinUI CollectionView does not recycle item-containers and instead creates a new item-container every time some data scrolls into view.

Steps to Reproduce

Minimum repo:

https://github.com/Keflon/MauiRecycleBug

Steps:

Create a CollectionView
Fill it with items
Scroll up and down in the CollectionView
For the sample, watch the Debug output.

Android

A small number of CollectionItem instances are created and these are recycled.
Example Debug output:
Created CollectionItem. InstanceId: 12. There are 12 instances allocated

WinUI

A new CollectionItem is created every time an instance scrolls into view.
Example Debug output:
Created CollectionItem. InstanceId: 133. There are 133 instances allocated

Scrolling quickly to the end and back (e.g. by dragging the scroll-bar) causes a CRASH

Scrolling slowly can eventually instigate an item being garbage-collected
Example Debug output:
Collected CollectionItem. InstanceId: 9. There are 129 instances allocated

Related: The DataTemplate in the sample code has a CheckBox.

1. The CheckBox is rendered incorrectly until the Window is resized horizontally.
   1. Should I open a new bug for this?
2. Having the CheckBox present in the DataTemplate causes a LOT of memory to be consumed, leading to an OutOfMemoryException
   1. Is this a separate bug?

Version with bug

6.0.400 (current)

Last version that worked well

6.0 Release Candidate 3

Affected platforms

Windows

Affected platform versions

Latest

Did you find any workaround?

Note: I can't confirm 100% this worked in the previous release because I don't know how to roll-back, but I'm certain this is a new problem.

Relevant log output

No response