[Bug] iOS: CollectionView items don't change their size when item content size is changed

[PureWeen]

Description

#3643 regressed between net8 and net9

When testing make sure to remove the code in MauiProgram on the host app that uses the CollectionView2 Handlers

#23746 caused the regression

The problem right now is that the code inside CV that listens to "MeasureInvalidated" is order dependent.

• In NET8 the order of events on most controls would go

Things changes on Controls => MEasureInvalidated fires => CV immediately doesn't a remeasure and uses this for the height

• in NET9 the order changed to

MEasureInvalidated fires => Things changes on Controls => CV immediately doesn't a remeasure and uses this for the height

My guess is that this code has always been somewhat brittle.

• How this should work is

Things change on Controls => Something indicates to the CV "Hey the content of this cell probably changed measure you should signal that it needs a layout pass" => now a layout pass is scheduled and the cell is remeasured.

[similar-issues-ai]

We've found some similar issues:

• [Bug] iOS: CollectionView items don't change their size when item content size is changed #3643 , similarity score: 82%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

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