Paste style wrote the copied fields straight onto the element, although a
pasted look is meant to be the style operation the assistant sends. It now
runs the engine's own restyle (bookElementStyled): a colour or face pasted by
hand takes the element off the theme, so the next theme applied no longer
brings the old colour back; a plain fill replaces the paint of the shape it
lands on instead of staying hidden under it; and a line takes another line's
look without its points, which are its course, not its look.
A background picked by hand in the inspector kept the page's link to the
theme, so the next theme applied set the page back to the theme's colour. The
picker and the background operation now paint through one helper that takes
the link away (withSpreadPaintByHand). Giving one page's background to every
page carries that page's link along, or takes the others' away when it was
painted by hand.
A built-in layout, a book's own layout and laying a page out again from its
entry ignored locks in the Studio: a locked shape was dropped and a locked
photo poured into a slot unlocked, while the assistant's layout operation left
both where they were. All four now lay a page out around its locked elements
through one function (layoutAroundLocks), which the engine's layout operation
uses too.
Fill page and fill spread kept the photo in its group, so the background
picture was selected and dragged with its caption and listed under the group
at the front. It leaves its group as the engine's fill does, and a group left
with one member goes.
Elements can be grouped on a page and picked, moved, resized, aligned and
restacked as one. A layers panel lists the page front to back with lock,
visibility, rename and drag to restack. The sheet gains marquee selection,
arrow-key nudge, one box that resizes a multi-selection with Shift holding
the proportions, and the design-tool shortcuts. The inspector lines a
selection up and spaces it out, and copies and pastes a style.
The assistant gets the same through the group, ungroup, name and hide
operations, and describe_book_page lists the groups. The format gains the
optional group, name and hidden fields and a spread's group names, so
BOOK_SCHEMA_REV goes to 2.