[Android] Fix incorrect height of CollectionView when ItemsSource is empty.

[Tamilarasan-Paranthaman]

Root Cause:

• The ItemSpacing was set in the MauiRecyclerView even when the ItemsSource was null. As a result, the default padding occupied space in the MauiRecyclerView.

Description of Change:

• The ItemSpacing (padding) should only be applied if the ItemsCount is greater than zero. Otherwise, padding should not be applied.

Issues Fixed

Fixes #23148

Before Issue Fix	After Issue Fix

[jfversluis]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

I haven't been able to reproduce the original issue.

Here I'm running the code from the original issue against our sandbox.

I'll test again once tests are added to see how you are reproducing this one.

[PureWeen]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[karthikraja-arumugam]

@PureWeen, I can reproduce the issue with the latest source as well. I'm using Visual Studio and an API 31 Pixel 5 emulator. We're testing this in the main branch, not with .net9. I hope this information helps.

[SuthiYuvaraj]

@PureWeen ,I have reproduced the issue using the latest dotnet maui main repository. The problem persists across API levels 31, 33, 34, and 35 on our emulators. For further reference, I've also attached a video demonstrating the issue.

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/rebase

[jsuarezruiz]

/rebase

[jsuarezruiz]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 3 pipeline(s).