[Windows] Notify changes in CollectionView Layouts

[jsuarezruiz]

Description of Change

Notify changes in CollectionView Layouts (Span, Spacing etc).

Issue fixed on Windows (changing Spans).

To validate the changes, launch the .NET MAUI Gallery and navigate to the CollectionView section. Select the "Vertical Grid" sample and update the Span property value.

Issues Fixed

FIxes #4112
Fixes #8387
Fixes #10144

[mandel-macaque]

Would look a lot nicer with a switch expression and the removal of the else clauses.

[jsuarezruiz]

Agree with that. In this case, just continued following the if-else approach used so far in Xamarin. https://github.com/xamarin/Xamarin.Forms/blob/caab66bcf9614aca0c0805d560a34e176d196e17/Xamarin.Forms.Platform.Android/Renderers/ButtonRenderer.cs#L140

[mandel-macaque]

I'm guessing that was an old code and did not have switch statements, since we are dealing with new code, lets try to update or code base, right?

[mandel-macaque]

Looks good. Some comments about using a switch expression, but that has nothing to do with how the code will behave and is just a note.

[hartez]

/backport to net7.0

[github-actions]

Started backporting to net7.0: https://github.com/dotnet/maui/actions/runs/5070755171

[github-actions]

@hartez backporting to net7.0 failed, the patch most likely resulted in conflicts:

$ git am --3way --ignore-whitespace --keep-non-patch changes.patch

Applying: Notify changes in CollectionView Layouts on Windows
Using index info to reconstruct a base tree...
M	src/Controls/src/Core/Handlers/Items/StructuredItemsViewHandler.Windows.cs
M	src/Controls/src/Core/PublicAPI/net-windows/PublicAPI.Unshipped.txt
Falling back to patching base and 3-way merge...
Auto-merging src/Controls/src/Core/PublicAPI/net-windows/PublicAPI.Unshipped.txt
CONFLICT (content): Merge conflict in src/Controls/src/Core/PublicAPI/net-windows/PublicAPI.Unshipped.txt
Auto-merging src/Controls/src/Core/Handlers/Items/StructuredItemsViewHandler.Windows.cs
CONFLICT (content): Merge conflict in src/Controls/src/Core/Handlers/Items/StructuredItemsViewHandler.Windows.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Notify changes in CollectionView Layouts on Windows
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@hartez an error occurred while backporting to net7.0, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.