What does the confirmation window for Regenerate appendices show?

Update to version 1.9.4 or later. Clicking Regenerate appendices no longer starts right away. A window lists, section by section, what will happen: "Will be rewritten" (sections BookyAI wrote and will write again from the current chapters), "Written for the first time" (sections the book does not have yet) and "Kept as they are" (sections you edited by hand, imported or wrote yourself). Nothing is touched until you click the Regenerate button, which also shows how many sections it will write. If every section is yours, the button is disabled and nothing is regenerated.