Craft records actions.deserialize as an undoable step and nothing cleared
history, so Undo right after load returned the canvas to the blank pre-load
Frame (autosave would then save it), and Undo after a page switch put the
previous page's content into the current slot.
- clear history after the load-time deserialize and after every page/
header/footer switch (in-place AI replacement of the same slot keeps it)
- continuousSetProp opens a burst only when its first call actually
changed something, so it never merges into an entry it did not create
- the empty-save banner's Undo is disabled when there is nothing to undo
Real-editor tests: load, page/header switch, no-op-first burst, banner.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
shadowdaoandClaude Opus 5.5
572e736f1f