Pull Request Template

Proposed Changes

remove from useFieldArray has two problems with the indexes you pass in:

1. Duplicated indexes remove extra rows. For example with rows a, b, c, d, remove([1, 1]) removes both b and c, because the second 1 is applied after the array has already shifted. With [a, c], remove([0, 0]) removes everything.
2. The array you pass in is sorted in place. remove([3, 1]) leaves your own array as [1, 3].

The fix removes duplicates and sorts a copy before the rows are removed. Output for normal calls is the same.

I added tests for the util and for useFieldArray.remove. They fail without the fix.

Fixes # (no issue, found while testing field array helpers)

Type of change

• 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 not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes