[ownedbycats]

Unexpected behaviour:

1. Create a chain with single-field edit that modifies an HTML longtext column. (I use it to add series descriptions to the aptly-named #seriesdescription.)
2. Run it on multiple books.
3. Without editing anything, switch to 'HTML source' tab and then back to 'Normal view'

The 'Apply to all' button will then enable itself as though the user had edited something.