Object: Unlock All and Show All with Shift+Alt act only within the selected object's group

Squashed from #4439 onto main.

docs/mcp.md

@@ -1345,6 +1345,14 @@ that were already hidden or locked. The key object is cleared when it is one of
 them again with the key object. When the call changes nothing, it records no undo step and still deselects them.
 Other `object.setProps` calls leave the selection unchanged.
 
+`object.unlockAll` and `object.showAll` unlock or show every locked or hidden object in the document and select
+them → `{count}`. With `scope: "group"` they take only the objects inside the groups that hold the selected objects:
+for each selected object, the group nearest above it, or the object itself when it is a group. The objects of a
+group inside another such group are counted once. With no selected object in a group, the call returns the error
+"nothing selected is in a group" and changes nothing. `scope: "document"` is the default, and any other value is
+refused. Object › Unlock All and Object › Show All clicked in the in-window menu bar with Shift+Alt (Shift+Option)
+held run with `scope: "group"`.
+
 `layer.move`, `node.move`, `layer.merge`, `layer.flatten`, `layer.collectInNew`, `dataset.select`, `dataset.next`
 and `dataset.prev` also deselect every selected object that is hidden or locked after the call, such as objects
 moved into a hidden or locked layer or group, or objects that a data set hides. The key object is cleared when it

docs/target-app-parity.md

@@ -910,6 +910,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   In isolation mode, the items of Object › Lock and Object › Hide, Unlock All and Show All are greyed out ([lock, hide, and delete objects](https://web.archive.org/web/20220303070637/https://helpx.adobe.com/illustrator/using/locking-hiding-deleting-objects.html)); the Contextual Task Bar's Lock button is greyed out too, the Properties panel's Quick Actions have no Lock, and the commands return an error. Pattern editing mode and opacity mask editing do not count as isolation mode for them.
   Liquify (its brush Width, Height and Angle, Intensity, Detail, Simplify, Twirl Rate, Complexity, Horizontal and Vertical), Puppet Warp (its Expand and each pin's angle), Transform in Perspective (its depth), Nudge in Perspective (its direction) and Move Plane (its location or distance) refuse a value other than a number or null, such as "40", Draw in Perspective refuses a click point that is not two numbers, and Width Profile refuses a point that is not three numbers; each leaves the document and its undo history as they were.
   Object › Lock › All Artwork Above and Object › Hide › All Artwork Above go through each top-level layer once, checking each object that is not selected against the selected objects below it: with 100 tiles selected under 25,000 rectangles, Lock took 6.4 s and now takes under 0.1 s, and with all of 5,001 objects selected it took 8.8 s and now takes under 0.1 s.
+  Object › Unlock All and Object › Show All clicked in the in-window menu bar with Shift+Alt (Shift+Option) held unlock or show only the objects inside the groups that hold the selected objects ([lock, hide, and delete objects](https://web.archive.org/web/20230623025912/https://helpx.adobe.com/illustrator/using/locking-hiding-deleting-objects.html)); `object.unlockAll` and `object.showAll` take `scope: "group"` for it.
   Lock Grid, Lock Station Point, Snap to Grid and Show Rulers (View › Perspective Grid) and Import Perspective Grid Presets (its choice to replace saved presets of the same names) refuse a value other than true, false or null, such as "true", and leave the grid and the saved presets as they were.
   All Artwork Above and Other Layers (Object › Lock and Object › Hide), Transform Each, Rearrange All Artboards, the width point and width profile commands, Liquify, Puppet Warp, Define Perspective Grid, Attach to Active Plane, Release with Perspective, moves and transforms in perspective, Move Plane and Move Plane to Match Object record no undo step when they change nothing.
   Move in Perspective (its copy, perpendicular and Snap to Grid choices), Transform in Perspective (its copy), Nudge in Perspective (its ×10 and copy), Draw in Perspective (Snap to Grid), Define Perspective Grid (its reproject choice), Show Perspective Grid, Width Point (Adjust Adjoining Width Points), Liquify (its pen pressure, Simplify and Affect choices) and Puppet Warp (its pins' rest shape) refuse a value other than true, false or null, such as "true", and leave the document and its undo history as they were.