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[windows, iOS & macOS]Grouped CollectionView with GridItemsLayout renders inconsistent layout across platforms #36545

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#36561
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[windows, iOS & macOS]Grouped CollectionView with GridItemsLayout renders inconsistent layout across platforms#36545
#36561
Labels
area-controls-collectionviewCollectionView, CarouselView, IndicatorViewpartner/syncfusionIssues / PR's with Syncfusion collaborationplatform/iosplatform/macosmacOS / Mac Catalystplatform/windowss/triagedIssue has been revieweds/verifiedVerified / Reproducible Issue ready for Engineering Triaget/bugSomething isn't working
Milestone
.NET 10 SR11

Description

@LogishaSelvarajSF4525
LogishaSelvarajSF4525
opened on Jul 13, 2026

Description

When using a CollectionView with GridItemsLayout (Span > 1) and grouping enabled, the layout is rendered inconsistently across platforms.

The CollectionView is configured with:
GridItemsLayout
Span = 5
Orientation = Vertical
VerticalItemSpacing set to a non-zero value (for example, 10)
IsGrouped = true

Steps to Reproduce

Clone the .NET MAUI repository and open it in Visual Studio.
Build and deploy the TestCases.HostApp project.
Navigate to Issue35700 in the HostApp(https://github.com/dotnet/maui/blob/inflight/candidate/src/Controls/tests/TestCases.HostApp/Issues/Issue35700.cs)
Run the sample on Windows, iOS, or macOS.
Observe the layout of the grouped CollectionView.

Actual behavior
The layout differs across platforms:

  • Windows: The first item in the first group is rendered smaller than the other items.
  • iOS: No spacing is applied between the group header and the first row of items.
  • macOS: No spacing is applied between the group header and the first row of items.

Expected behavior
The grouped CollectionView should render consistently across all platforms:

  • All items should have a uniform size.
  • The configured VerticalItemSpacing should be applied consistently.
  • The spacing between the group header and the first row of items should match the expected layout on every platform.

Link to public reproduction project repository

https://github.com/dotnet/maui/blob/inflight/candidate/src/Controls/tests/TestCases.HostApp/Issues/Issue35700.cs

Version with bug

Unknown/Other

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

macOS, Windows, iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

Activity
  1. LogishaSelvarajSF4525
    added 
    t/bugSomething isn't working
     on Jul 13, 2026
  2. dotnet-policy-service
    added 
    partner/syncfusionIssues / PR's with Syncfusion collaboration
     on Jul 13, 2026
  3. github-actions
    added 
    area-controls-collectionviewCollectionView, CarouselView, IndicatorView
     
    platform/ios
     
    platform/macosmacOS / Mac Catalyst
     
    platform/windows
     on Jul 13, 2026
  4. Shalini-Ashokan commented on Jul 13, 2026 
    @Shalini-Ashokan
    Shalini-Ashokan
    on Jul 13, 2026
    Contributor
    This issue has been validated in Visual Studio Code 1.128.0 with .NET MAUI versions main branch. It can be reproducible on Windows, iOS and Mac platforms.
  5. Ahamed-Ali
    added 
    s/verifiedVerified / Reproducible Issue ready for Engineering Triage
     
    s/triagedIssue has been reviewed
     on Jul 13, 2026
  6. sheiksyedm
    added this to the  .NET 10 SR10 milestone on Jul 13, 2026
  7. vishnumenon2684
    added 
    regressed-in-inflight/candidate
     and removed 
    regressed-in-inflight/candidate
     on Jul 14, 2026
  8. kubaflo
    added 3 commits that reference this issue on Jul 20, 2026
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    13533be
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    7dc1d9b
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    473550d
  9. 6 remaining items
  10. rmarinho
    added a commit that references this issue on Aug 25, 2026
    Publish reproduction evidence for #36545 on catalyst
    9023627
  11. kubaflo
    added 12 commits that reference this issue on Aug 27, 2026
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    4aa8be4
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    a1d668b
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    625c06b
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    7a08e32
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    d35261c
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    e33ef46
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    c9b48f1
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    16b0d48
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    97b0de7
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    5ab2c64
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    9551ab9
    Fix inconsistent Grouped CollectionView (GridItemsLayout) rendering o…
    19aea8f
  12. kubaflo
    closed this as completedin 19aea8fon Sep 11, 2026
  13. github-actions
    locked and limited conversation to collaborators on Oct 12, 2026
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