[Bug] [iOS] CollectionView doesn't support simple data entry form that uses Editor.AutoSize="TextChanges"

[lafritay]

Description

I have an incredibly simple CollectionView that is being used as a data entry form. When I try to use the Editor AutoSize="TextChanges" feature, things break. As the user types, once they hit a new line and the Editor needs to resize, the text they are editing scrolls out of view. This is what is shown in the sample. In my slightly more complicated production app, it scrolls so far out of view that the item view itself is destroyed (because it has scrolled so far) and it doesn't properly recreate when scrolled back to.

Steps to Reproduce

1. In the attached sample, scroll to the bottom until you see the field labeled "TYPE INTO ME UNTIL YOU HIT A NEW LINE".
2. Start typing. Before you hit a new line, it will function well and look like this:

3. Once you type enough that it has to wrap, the view will scroll so that the text you were typing is no longer in view:

This happens each time the control needs to wrap. Also notice that other items above have been sized incorrectly (extra space below some of the input boxes).

Expected Behavior

Keep the same scroll position.

Actual Behavior

Text being entered scrolls out of view

Basic Information

• Version with issue: XF 4.8.1560.
• Last known good version: Unknown (probably never)
• IDE: VS for Mac
• Platform Target Frameworks:
  • iOS: Xamarin.iOS 14.0. Reproed on iOS 13.7
• Nuget Packages: None
• Affected Devices: IPhone simulators and physical devices

Screenshots

See above.

Reproduction Link

Bugs 2.zip

Workaround

I can switch to using AutoSize="Disabled" but that leads to a far inferior experience.