[iOS] Fix for CollectionView with horizontal grid layout has extra space on right end

[Tamilarasan-Paranthaman]

Root Cause of the issue

• The HorizontalItemSpacing was being applied from the GetInsetForSection method, even though it was not a grouped collection

Description of Change

• The HorizontalItemSpacing should not be applied from the GetInsetForSection method when it is not a grouped collection. Therefore, I set the return value to zero, which resolves the issue.

Note

• Unfortunately, I was not able to validate the issue fix in CollectionView2 using HorizontalOptions set to center, as it seems the collection view occupies the entire width in CV2. For now, I have used CollectionView1 in the test sample since I have fixed the issue in CollectionView1.

maui/src/Controls/tests/TestCases.HostApp/Issues/Issue25433.xaml

Line 8 in d0d9a53

<cv1:CollectionView1 Grid.Row="0"

Issues Fixed

Fixes #25433

Tested the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Screenshot

• Note: I have set the CollectionView background color to red to make the differences more visually apparent. The red areas in the image represent the spaces.

1. Without Grouping:

Before Issue Fix	After Issue Fix

2. With Grouping

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.

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

VerifyScreenshot is not implemented on Catalyst yet. Should not be necessary to avoid in that platform.
Why avoid it on Windows?

[Tamilarasan-Paranthaman]

@jsuarezruiz, It seems that item spacing on the Windows platform is still not functioning correctly, so I am skipping the Windows platform for now. For your reference, I have attached the related issue report #11320. How can we proceed with this? Please share your thoughts.

[jsuarezruiz]

Could you include a comment in code with a reference to the issue #11320?

[Tamilarasan-Paranthaman]

@jsuarezruiz, I have added a comment. Could you please check and provide your concerns if any?

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).