[Inflight/Candidate][iOS] Fix for ShouldIgnoreBottomContentInsetForCollectionViewItems - Editor cells becoming invisible in CollectionView (CV1) - #36107
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…cells by tracking the last MAUI-arranged height through a PlatformArrange override instead of using Bounds.Height, preventing transient UIKit placeholder frames from collapsing Editor cells to an invisible size.
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Issue details
When using an Editor inside a CollectionView with the legacy handler (CV1) on iOS, the Editor cells collapse and become invisible after the user taps on them to begin typing.
Root Cause of the Regression
The issue occurs because of the scrollability cap introduced in EditorHandler.GetDesiredSize by PR #35309. This cap was added to prevent Editors from growing unboundedly when AllowAutoGrowth = false. However, the native layout container assigns a transient placeholder height of 1pt directly to MauiTextView.Bounds via UIKit, completely bypassing MAUI's PlatformArrange pipeline. When the keyboard appears and the layout invalidates, GetDesiredSize is called and the cap reads Bounds.Height = 1 > 0 and ContentSize.Height = 36 > 1, both true, so it fires incorrectly, capping every Editor cell to 1pt and making them invisible.
Description of Change
The fix involves overriding PlatformArrange in EditorHandler to track the last MAUI-arranged height in a _lastArrangedHeight field, and using that value instead of PlatformView.Bounds.Height inside the scrollability cap condition. Since the native layout container assigns the placeholder height directly via UIKit without going through PlatformArrange, _lastArrangedHeight remains 0 until MAUI explicitly arranges the view.
The cap condition currentHeight > 0 therefore evaluates to false for placeholder frames, skipping the cap automatically. Once MAUI arranges the view with a real height, _lastArrangedHeight is updated and the cap applies correctly for all subsequent measure passes, Editors outside a CollectionView are completely unaffected.
Regression PR: #35309
Issues Fixed
iOS UI Test: CV1: ShouldIgnoreBottomContentInsetForCollectionViewItems