[iOS] ScrollView content offset shifts unexpectedly when FlowDirection is changed

[kubaflo]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Description of Change

This PR addresses an issue where switching the layout direction from Right-to-Left (RTL) to Left-to-Right (LTR) could result in incorrect content positioning due to stale or inconsistent scroll offsets.

To ensure layout consistency, we now explicitly reset the ContentOffset to (0,0) before performing layout adjustments. This prevents any residual offset from affecting the new layout direction.

Issues Fixed

This PR fixes a problem addressed here

#29458 (comment)

Before	After
Screen.Recording.2025-06-18.at.16.34.17.mov	Screen.Recording.2025-06-18.at.16.33.26.mov

[dotnet-policy-service]

Hey there @@kubaflo! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull Request Overview

This PR fixes an issue where switching the layout direction on iOS could leave stale scroll offsets, causing misaligned content in a ScrollView. It explicitly resets ContentOffset to (0,0) before rearranging and then reapplies the correct horizontal offset for RTL layouts.

• Reset ContentOffset to zero before re-arranging content in RTL
• Compute and apply the correct horizontal offset after layout

Comments suppressed due to low confidence (1)

src/Core/src/Platform/iOS/MauiScrollView.cs:64

• Consider adding a UI or unit test in TestCases.Shared.Tests and TestCases.HostApp to verify that ContentOffset is reset when switching the FlowDirection, ensuring this behavior is covered by automated tests.

						ContentOffset = new CGPoint(0, 0);