6.4.3 Transaction hooks
The transaction hooks inform about changes in transaction histories.
The transaction histories are local (and independent) for pages, so transaction
hooks are local for pages, too.
- New – a new item in the undo history was created
- Delete – an item of the undo history was deleted
- Update – un item item of the undo history changed its name
- Undo – one item was undone
- Redo – one item was redone
- Saved – the “saved” flag of a page (or a document) was set