[Mac] Unable to Select Multiple Items in CollectionView with SelectionMode='Multiple'

[LogishaSelvarajSF4525]

Description

In .NET MAUI, when using a CollectionView with SelectionMode="Multiple" on Maccatalyst, the control does not function as expected for multi-selection. Instead of allowing multiple items to be selected at once, only one item can be selected at a time. When a new item is selected, the previously selected item is automatically deselected.

This issue was identified during the investigation of MultipleBoundSelection.

In mac,

Screen.Recording.2025-01-03.at.3.09.52.PM.mov

In android,

Screen.Recording.2025-01-03.at.3.08.28.PM.mov

Steps to Reproduce

1. Build and run the provided application on Mac catalyst.MultipleSelection.zip
2. Attempt to select multiple items in the CollectionView.
3. Observe that selecting a new item causes the previously selected item to become deselected.

Expected Behavior:
The CollectionView should allow users to select multiple items simultaneously when SelectionMode="Multiple" is set, retaining all selected items without deselecting any previously selected items.

Actual Behavior:
Selecting a new item in the CollectionView deselects the previously selected item, limiting the selection to a single item at any time.

Link to public reproduction project repository

No response

Version with bug

9.0.21 SR2.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

9.0.21 SR2.1

Affected platforms

macOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[similar-issues-ai]

We've found some similar issues:

• Multiselection for Collectionview doesn't works on MacCatalyst #18028 , similarity score: 90%
• [MAUI] I4_ Selection - Multiple selection failed on MacCatalyst Platform #23372 , similarity score: 83%
• Double Trigger of CollectionView SelectionChanged Event on MacCatalyst Platform #25826 , similarity score: 82%

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

Note: You can give me feedback by 👍 or 👎 this comment.

[mattleibow]

Duplicate of #18028

[mattleibow]

This comment has useful info: #18028 (comment)