Fixes https://github.com/payloadcms/payload/issues/13904
When using Postgres, saving a document can cause the editor to re-mount.
If the document includes a blocks field, this leads to the editor
incorrectly resetting its value to the previous state. The issue occurs
because the editor is re-mounted without recalculating the initial
Lexical state.
This re-mounting behavior is caused by how Postgres handles JSON
storage:
- With `jsonb` columns, unlike `json` columns, object key order is not
guaranteed.
- As a result, saving and reloading the Lexical editor state shifts key
order, causing `JSON.stringify()` comparisons to fail.
## Solution
To fix this, we now compare the incoming and previous editor state in a
way that ignores key order. Specifically, we switched from
`JSON.stringify()` to `dequal` for deep equality checks.
## Notes
- This code only runs when external changes occur (e.g. after saving a
document or when custom code modifies form fields).
- Because this check is infrequent, performance impact is negligible.
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