Artboards: Duplicate Artboards, Copy and Cut take every selected artboard

With several artboards selected, the Artboards panel menu's Duplicate
Artboards copied only the active one, and Copy and Cut with the
Artboard tool took only the tool's active artboard.

artboard.duplicate, artboard.copy and artboard.cut now take `indices`,
and without `index` or `indices` they act on the artboards the
Artboard tool has selected. Duplicate Artboards passes the selected
artboards and selects the copies. Duplicate and Cut are one undo step
each, and Paste adds every copied artboard back, with its art, in one
undo step. The copies keep their places relative to each other,
together right of the last artboard. A cut fails when it names every
artboard.

Docs: docs/mcp.md, docs/target-app-parity.md.

docs/mcp.md

@@ -2350,19 +2350,22 @@ on top / at the bottom of the current layer. `edit.pasteOnAllArtboards` keeps th
 copied from. `layer.pasteRemembersLayers {on?}` (a document option, `document.inspect` → `pasteRemembersLayers`)
 pastes objects back into the layers they came from, by name, making missing ones.
 
-Artboards copy with their art. `artboard.copy {index?, art?}` puts an artboard on the clipboard together with the
-art fully inside it (`art` defaults to the Artboard tool's `moveArt` option, Move/Copy Artwork with Artboard; locked
-and hidden art only with prefs `moveLockedWithArtboard`); with the Artboard tool chosen, `edit.copy` does this for
-the tool's artboard and `edit.cut` runs `artboard.cut`, which also deletes them (never the only artboard). Then
-`edit.paste` adds a copy of the artboard right of the last one, with its art in the layers it came from, in one undo
-step (`edit.pasteInPlace`, `edit.pasteInFront` and `edit.pasteInBack` put it where it was; `edit.pasteOnAllArtboards`
-pastes only the art), in this document or another; the result's `artboard` is the new artboard's index.
-`artboard.duplicate {index?, art?}` (Window › Artboards › Duplicate Artboards, or a row dragged onto New Artboard)
-does the same in one step → `{index, ids}`, and `artboard.move {copy: true, moveArt: true}` is the Artboard tool's
-Alt-drag. These two commands also move the pattern tiles of the copies when `patterns` is true (default: prefs
-`transformPatternTiles`); `edit.paste` leaves the tiles of a pasted artboard's art where they were.
-`artboard.copy`, `artboard.cut` and `artboard.duplicate` take the Artboard tool's artboard when the call names no
-`index`. Every artboard command that takes an `index` fails with `no such artboard` when the `index` is not the
+Artboards copy with their art. `artboard.copy {index? | indices?, art?}` puts artboards on the clipboard together
+with the art fully inside each (`index` and `indices` default to the artboards the Artboard tool has selected; `art`
+defaults to the tool's `moveArt` option, Move/Copy Artwork with Artboard; locked and hidden art only with prefs
+`moveLockedWithArtboard`); with the Artboard tool chosen, `edit.copy` does this for the tool's selected artboards and
+`edit.cut` runs `artboard.cut`, which also deletes them (one artboard is always left: a cut of every artboard fails).
+Then `edit.paste` adds a copy of each artboard, together right of the last one and placed as they lay, with their art
+in the layers it came from, in one undo step (`edit.pasteInPlace`, `edit.pasteInFront` and `edit.pasteInBack` put
+them where they were; `edit.pasteOnAllArtboards` pastes only the art), in this document or another; the result's
+`artboards` lists the new artboards' indices and `artboard` is the first of them, and the Artboard tool, when chosen,
+selects them. `artboard.duplicate {index? | indices?, art?}` does the same in one step → `{index, indices, ids}`.
+Window › Artboards › Duplicate Artboards passes the selected artboards (those the Artboard tool has selected, else the
+active one) as `indices`, and a row dragged onto New Artboard passes its artboard as `index`.
+`artboard.move {copy: true, moveArt: true}` is the Artboard tool's Alt-drag. `artboard.duplicate` and `artboard.move`
+also move the pattern tiles of the copies when `patterns` is true (default: prefs `transformPatternTiles`);
+`edit.paste` leaves the tiles of a pasted artboard's art where they were.
+Every artboard command that takes an `index` fails with `no such artboard` when the `index` is not the
 0-based index of an artboard (past the last one, negative, fractional, a string or null), and the document and the
 clipboard stay as they were.
 

docs/target-app-parity.md

@@ -535,6 +535,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   Choosing the Artboard tool (Shift+O, its toolbar button, Edit Artboards in Properties or Document Setup, or the Artboards panel menu's Artboard Options…) starts it on the active artboard: the canvas outlines that artboard, and Delete, Cut, Copy, the Transform panel and Artboard Options act on it.
   Object › Artboards › Fit to Selected Art resizes the active artboard (`artboard.fitToSelection {index}`). It used to resize artboard 1 whichever artboard was active. When an action plays, its Fit to Artwork Bounds and Fit to Selected Art steps that name no artboard resize the artboard that is active then.
   Object › Artboards › Fit to Artwork Bounds and the Artboards panel menu's Fit to Artwork Bounds fit each selected artboard (those the Artboard tool has selected, else the active one) to the art on it, as the public [Use the artboard context menu](https://helpx.adobe.com/illustrator/desktop/create-manage-artboards/organize-manage-artboards/use-artboard-context-menu.html) page describes (`artboard.fitToArt {indices}`). An object partly on an artboard counts for each artboard it overlaps, and an artboard with no art on it keeps its size and place. They used to fit the active artboard to all the art in the document.
+  The Artboards panel menu's Duplicate Artboards copies each selected artboard (those the Artboard tool has selected, else the active one) with its art, in one undo step, and the copies are then selected, as the public [Use the artboard context menu](https://helpx.adobe.com/illustrator/desktop/create-manage-artboards/organize-manage-artboards/use-artboard-context-menu.html) page describes. With the Artboard tool, Copy and Cut take every selected artboard with its art, as the public [Cut, copy, and paste artboards](https://helpx.adobe.com/illustrator/desktop/create-manage-artboards/organize-manage-artboards/cut-copy-and-paste-artboards.html) page describes, and Paste brings them all back in one undo step (`artboard.duplicate`, `artboard.copy` and `artboard.cut` with `indices`). The copies keep their places relative to each other, together right of the last artboard. All three used to act on the active artboard only.
   The canvas draws the active artboard's edge in black, as the public [Select artboards](https://helpx.adobe.com/illustrator/desktop/create-manage-artboards/add-edit-artboards/select-artboards.html) page describes. It draws the other artboards' edges in gray. With several artboards selected by the Artboard tool, the canvas draws the black edge around the active one, which the tool shows with handles and its name. It used to draw artboard 1's edge in black whichever artboard was active.
   View › Rotate View turns the view to the status bar's preset angles (`view.rotate {angle}`, which takes any angle). View › Rotate View to Selection turns the view to the angle of the selected objects' bounding box, so the box is square to the window (`view.rotateToSelection`).
   When the view angle changes (a Rotate View drag, the status bar's angle menu, Reset Rotate View or a saved view) and the desktop app renders the frame at the new angle on the render worker, the canvas draws the last frame turned to the new angle until that frame is ready. It used to draw no art until then.