Fix rich text split error

[cursor]

Patch window.wp.richText.split to prevent TypeError when pasting content by ensuring it always returns an iterable array.

The splitValue function in @wordpress/block-editor expects split(value) to return an array of two RichTextValue objects. However, in certain paste scenarios, split can return undefined or a non-array, leading to a TypeError during destructuring. This patch wraps split to normalize its output, guaranteeing a two-item array and preventing the error.

---

 

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}