Slides: reuse slides from another presentation

Home › New Slide gains Reuse Slides… and Reuse Slides (Keep Source
Formatting)…, backed by a new slide.reuse command that inserts the
slides of a .pptx or .deckcraft file (all, a list, or a range) after the
current slide in one undo step. By default each slide moves to the
destination layout with the same name or kind, so it takes this deck's
theme; keepFormatting brings the source master and its layouts along.
Pictures, media and sounds are copied under fresh media ids, so ids
that clash between the two decks no longer mix up pictures, and shape
ids are renumbered with animations, triggers and connector ends
following them.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/gaps.md

@@ -184,7 +184,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Estimate:** 3–6 h to review, land and round-trip.
 
 ### Smaller missing rows
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
+Zoom (summary/section/slide, 6–10 h), reuse slides pane with thumbnails (1–2 h; `slide.reuse` inserts from a file), laser pointer (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile

docs/parity-checklist.md

@@ -68,7 +68,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Files | Export video (MP4) / animated GIF | P2 | M |
 | Files | Print (slides, handouts, notes, outline) | P1 | M |
 | Files | Password protection | P2 | M |
-| Files | Reuse slides from another file | P1 | M |
+| Files | Reuse slides from another file | P1 | P |
 | Files | Drag and drop files onto the window | P1 | D |
 | Files | OpenDocument .odp open/save | P2 | M |
 | Slides | New slide by layout | P0 | D |