Clear cached layout attributes if the data source counts change

[bryankeller]

Details

I meant to include this with my last PR - this fixes an issue that causes off-screen cells coming into view due to a batch update to use incorrect layout attributes, causing them to have an incorrect size during the animation. In the video below, you can see that cell 0 is deleted, cell 1 animates in from above the top edge of the screen, and incorrectly reuses the cached layout attributes of cell 2 (new cell 1 after updates), which is a really tall cell.

Simulator.Screen.Recording.-.iPhone.15.Pro.-.2024-03-06.at.17.50.04.mp4

Related Issue

N/A

Motivation and Context

Bug fix

How Has This Been Tested

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.