[iOS] Editor jumps to middle of screen when focused with cursor at bottom

Description

Bug description

When focusing an Editor with a large amount of text and a fixed height (HeightRequest), the entire page view unexpectedly scrolls upward, positioning the editor roughly in the middle of the screen above the keyboard.

This behavior occurs only when the text cursor (caret) is located at the very bottom visible line of the Editor at the moment of focusing.
If the cursor is placed anywhere else (for example, in the top or middle lines), the issue does not occur.

The issue started appearing with .NET 9.0.0 workloads.
It works correctly in .NET 8.0.100 workloads.

Affected platforms
iOS

My testing platform

• Platform: iOS
• Version: iOS 18.5 (Simulator – iPhone 16 Pro Max)
• .NET version: .NET 9
• MAUI workload version: 9.0.82 (also reproducible since 9.0.0)
• Regression from: .NET 8.0.100
• Reproduces on device and simulator: Yes
• Reproduces on Android: No

Expected behavior

The page layout should remain stable when the editor receives focus.
The system should only adjust enough to keep the caret visible, not shift the entire content up.

Actual behavior

When the cursor is on the bottom visible line and the editor is focused, the entire page shifts upward, centering the control above the keyboard.
If the cursor is not at the bottom, the issue does not occur.

Steps to Reproduce

Use my repo:
https://github.com/mtopolewski/MauiEditorIssueApp
And look at my video:
https://github.com/user-attachments/assets/f1f88890-4b7f-4299-9cbd-b036403373c9

Link to public reproduction project repository

https://github.com/mtopolewski/MauiEditorIssueApp

Version with bug

9.0.0 GA

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

.net8 8.0.100

Affected platforms

iOS

Affected platform versions

18.5

Did you find any workaround?

Back to .net8 (workload 8.0.100)

Start with the linked MauiEditorIssueApp reproduction project and reproduce the focus case on iOS 18.5 with the .NET 9.0.82 workload, then compare it with .NET 8.0.100. Done means the page remains stable when a fixed-height Editor is focused with the caret on its bottom visible line, while the caret still remains visible above the keyboard.