The fix for child FlexLayout content appearing no longer works starting from version 8.0.61

[Tamilarasan-Paranthaman]

Root Cause of the issue

• The issue occurs because the SelfSizing delegate for item is assigned during initialization via the AddFlexItem method, and it captures the value of InMeasureMode at that time. When InMeasureMode is later updated in CrossPlatformMeasure, the captured value inside the delegate remains unchanged (in this case, false) for the child FlexLayout content. This causes the else part of the logic to use the desired size, resulting in the content not being visible in the UI.

Description of Change

• I fixed it by adding the boolean property as an argument to the delegate, which dynamically updates the changes to the boolean, and it works fine.

Regressed PR

• Prevent measure in flexlayout during arrange pass #22411

Issues Fixed

Fixes #23491

Tested the behaviour in the following platforms

• Windows
• Android
• iOS
• Mac

Screenshot

Windows

Before Issue Fix	After Issue Fix

Android

Before Issue Fix	After Issue Fix

iOS

Before Issue Fix	After Issue Fix

Mac

Before Issue Fix	After Issue Fix

[dotnet-policy-service]

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

[jfversluis]

/azp run

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[Copilot]

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

src/Controls/src/Core/Layout/FlexLayout.cs:588

• Ensure that the new behavior introduced by the inMeasureMode parameter is covered by tests.

_root.Layout(InMeasureMode);

[Copilot]

The change in the delegate signature is potentially a breaking change. Please ensure that this change is documented and communicated appropriately.

This comment was generated based on a coding guideline created by a repository admin.

[StephaneDelcroix]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[StephaneDelcroix]

I don't see the relation between the fix and the title (FlexLayout vs BindableLayout). could you please fix the PR subject ?

[Tamilarasan-Paranthaman]

I don't see the relation between the fix and the title (FlexLayout vs BindableLayout). could you please fix the PR subject ?

@StephaneDelcroix, I have updated the PR title to reflect the fixed context. Could you please review it now?