Objects on Path: the Move All widget slides every attached object along the path

With one Objects on Path group selected whose objects have room to move,
the Selection and Objects on Path tools show a diamond below the first
object. Dragging it moves every object along the path together, keeping
the distances between them (object.objectsOnPath.options with start),
in one undo step; Escape cancels it, and the first object's distance
along the path shows next to the pointer.

On an open path the widget shows only when the distance from the first
object to the last is shorter than the path, and the objects stop at its
ends; on a closed path they go on round across the first anchor. Where
Auto or a Space value the open path is too short for sets the distance,
the drag also sets spacing to the distance as drawn.

docs/mcp.md

@@ -8160,6 +8160,18 @@ than the end. With Alt (Option on macOS) held, the objects spread from both ends
 open path, or of the first anchor of a closed path, up to the whole path. With measurement labels on, the distance
 between the objects shows next to the pointer in the document's units. Escape cancels the drag.
 
+When the objects have room to move along the path, the same tools show the Move All widget, a diamond below the
+group's first object joined by a line to its attachment point. On an open path that is when the distance from the first
+object to the last is shorter than the path: one object, or a Space value that leaves part of the path free, but not
+Auto from the first anchor, which spreads the objects to both ends. On a closed path the widget always shows. Dragging
+it moves every object along the path as far as the pointer moves along the path, keeping the distances between them,
+and previews `object.objectsOnPath.options {ids: [group], start}` and keeps it as one undo step on release. On an open
+path the objects stop where the first one reaches the first anchor or the last one reaches the end, and moving the
+pointer back moves them back at once; on a closed path they go on round across the first anchor. Where Auto or a Space
+value the open path is too short for sets the distance, the drag also sets `spacing` to the distance as drawn, so the
+objects stay that far apart. Shift and Alt do not change the drag. With measurement labels on, the first object's
+distance along the path shows next to the pointer in the document's units. Escape cancels the drag.
+
 ```json
 {"name":"run_command","arguments":{"command":"tool.setOption","params":{"tool":"objectsOnPath","values":{"pivot":7,"rotate":30}}}}
 {"name":"run_command","arguments":{"command":"object.objectsOnPath.attach","params":{"path":30,"ids":[12,15,18]}}}

docs/target-app-parity.md

@@ -1251,8 +1251,9 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   When the object the Blend tool picked first is deleted or undone away before the second click, the next click on an object picks that object first instead of doing nothing. Regression tests: `blend_tool_picks_again_when_its_first_pick_is_gone` in `meshblend.rs` and `the_blend_tool_picks_again_when_its_first_pick_is_deleted` in `tests/blendopts.rs`.
   Window › Blend opens the Blend panel: Make, the selected blend's Spacing and Orientation (with no blend selected, the options new blends start with), Reverse Front to Back, Reverse Spine, Replace Spine, Expand and Release, each running its Object › Blend command. Make is dimmed until two or more objects are selected. Spacing and Orientation are dimmed until a blend or two or more objects are selected, and the other buttons are dimmed until a blend is selected.
   With the Blend tool, Escape drops the object clicked first and stops the next click adding to the blend just made, so the next click picks a new first object; the document and the selection stay as they are. Regression tests: `escape_drops_the_blend_tools_first_pick` in `meshblend.rs` and `tests/blendopts.rs`.
-  Objects on Path (#2545): a click with the Objects on Path tool (in Edit Toolbar's Modify section and the Blend tool's flyout; Object › Objects on Path › Attach and the context menu with two or more objects selected choose it) attaches the selected objects to the path clicked, open or closed, in an Objects on Path group with the path at its bottom. The objects go along the path column by column from left to right, spread evenly from its first anchor (the last one sits on the end of an open path), each turned to the path at its attachment point; Pivot and Rotate set where each one attaches and how far it tilts (`object.objectsOnPath.attach`, `object.objectsOnPath.options`), and with Objects on Path groups selected the Properties panel's Objects on Path Options section shows them as a nine-point Pivot grid and a Rotate field with common angles, each change one undo step for every selected group. Editing the path moves the objects, an object moved on its own goes back, objects moved into or out of the group in the Layers panel join or leave the path, and Object › Objects on Path › Expand leaves a plain group. The group saves and reopens live and exports as plain art. With one Objects on Path group selected, the Selection and Objects on Path tools show the Rotate All widget beside its first object: dragging it turns every object about its attachment point by the angle the pointer turns, adding it to the group's Rotate in one undo step, in 15° steps with Shift ([Objects on Path](https://helpx.adobe.com/illustrator/using/objects-on-path.html)). The Move All and Select/Move widgets and Detach are missing.
+  Objects on Path (#2545): a click with the Objects on Path tool (in Edit Toolbar's Modify section and the Blend tool's flyout; Object › Objects on Path › Attach and the context menu with two or more objects selected choose it) attaches the selected objects to the path clicked, open or closed, in an Objects on Path group with the path at its bottom. The objects go along the path column by column from left to right, spread evenly from its first anchor (the last one sits on the end of an open path), each turned to the path at its attachment point; Pivot and Rotate set where each one attaches and how far it tilts (`object.objectsOnPath.attach`, `object.objectsOnPath.options`), and with Objects on Path groups selected the Properties panel's Objects on Path Options section shows them as a nine-point Pivot grid and a Rotate field with common angles, each change one undo step for every selected group. Editing the path moves the objects, an object moved on its own goes back, objects moved into or out of the group in the Layers panel join or leave the path, and Object › Objects on Path › Expand leaves a plain group. The group saves and reopens live and exports as plain art. With one Objects on Path group selected, the Selection and Objects on Path tools show the Rotate All widget beside its first object: dragging it turns every object about its attachment point by the angle the pointer turns, adding it to the group's Rotate in one undo step, in 15° steps with Shift ([Objects on Path](https://helpx.adobe.com/illustrator/using/objects-on-path.html)). The Select/Move widget and Detach are missing.
   Objects on Path Space widget: with one Objects on Path group of two or more objects selected, the Selection and Objects on Path tools show a square handle beyond its last object; dragging it along the path, round its bends, sets the distance between the objects' attachment points in one undo step, the first object staying where it is, and with Alt (Option on macOS) the objects spread from both ends toward the center; the distance shows next to the pointer during the drag, in the document's units ([Rearrange and edit objects on a path](https://helpx.adobe.com/illustrator/desktop/manage-objects/arrange-objects/rearrange-and-edit-objects-on-a-path.html), [Objects on Path](https://helpx.adobe.com/illustrator/using/objects-on-path.html)). The group keeps the distance (`object.objectsOnPath.options {spacing, start}`) through Pivot and Rotate changes, path edits, copies, saving and reopening, and scales it with the group; by default (`"auto"`) the objects are spread evenly as before. Evidence: `objects_on_path::tests::{space_sets_the_distance_between_the_stops, space_on_a_closed_path_wraps_at_the_first_anchor_and_stops_short_of_the_first_object}` in `crates/doc`, `tests::objects_on_path::space_sets_the_distance_between_the_objects_in_one_undo_step` in `crates/engine`, `objects_on_path::tests::dragging_the_space_widget_spaces_the_objects_from_the_first_one` in `crates/tools`.
+  Objects on Path Move All widget: with one Objects on Path group selected whose objects have room to move, the Selection and Objects on Path tools show a diamond below its first object; dragging it along the path, round its bends, moves every object along the path together in one undo step, keeping the distances between them (`object.objectsOnPath.options {start}`). On an open path the widget shows only when the distance from the first object to the last is shorter than the path, so not for objects spread evenly from end to end, and the objects stop at the path's ends; on a closed path they go on round across its first anchor. The first object's distance along the path shows next to the pointer during the drag, in the document's units ([Rearrange and edit objects on a path](https://helpx.adobe.com/illustrator/desktop/manage-objects/arrange-objects/rearrange-and-edit-objects-on-a-path.html), [Objects on Path](https://helpx.adobe.com/illustrator/using/objects-on-path.html)). Evidence: `objects_on_path::tests::{dragging_the_move_all_widget_moves_every_object_along_the_path, a_move_all_drag_on_a_closed_path_goes_round_across_the_first_anchor}` in `crates/tools`, `canvas::tests::a_selected_objects_on_path_group_shows_its_move_all_widget_when_it_has_room` in `crates/ui-egui`.
   Double-clicking the Objects on Path tool opens Objects on Path Tool Options ([Objects on Path](https://helpx.adobe.com/illustrator/using/objects-on-path.html)): the nine-point Pivot grid and the Rotate field set the attachment point and angle of the objects attached next, and groups already attached keep theirs; Reset puts the center and 0° back. Save keeps the options across tool switches and saves them with the preferences (`tool.setOption {tool: "objectsOnPath"}`).
 - **Paint and appearance (M3):**
   - **CSS swatch libraries:** fractional linear and radial gradient stop positions are preserved, so nearby stops such as 12.5% and 12.890625% remain distinct instead of collapsing to 13%. Reference: [CSS Images 3 color stops](https://www.w3.org/TR/css-images-3/#color-stop-syntax). The original synthetic regression is `palette_io::tests::css_preserves_fractional_gradient_stop_positions` in `crates/color/src/palette_io.rs`. Scores and hours are unchanged.