Blend spine: Shift-click picks several spine points, which drag together (#5285)

Direct Selection kept only one picked point of a blend's spine. Shift-click
now adds a point of the same spine or takes it away, and dragging any picked
point moves them all. object.blend.spine.moveAnchor takes `with`, the other
points to move by as much, with the key objects on them, in one undo step.

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-06 · **Change:** minor (Direct Selection: Cmd/Ctrl held lends the Selection tool and shows its bounding box, #3901; Join tool trims two crossing open paths and joins them at the crossing, #5844; Control bar: Paragraph: link and Align left/center/right while type is selected, #5372; scores and estimates unchanged) · **Target:** Adobe Illustrator 2026 (30.x; Units › East Asian Type acts, with Q and Ha units; scores unchanged)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-06 · **Change:** minor (Direct Selection: Shift-click picks several blend spine points, which drag together, #5285; scores and estimates unchanged) · **Target:** Adobe Illustrator 2026 (30.x; Units › East Asian Type acts, with Q and Ha units; scores unchanged)
 
 ## Feature submission evidence
 
@@ -38,6 +38,7 @@ Artboard Options forwards the active Artboard tool's Scale Artwork with Artboard
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-11-05 | minor | Direct Selection: Shift-click picks several points of a blend's spine and dragging one moves them all, with the key objects on them, in one undo step (#5285); scores and estimates unchanged |
 | 2026-11-05 | minor | Direct Selection: Cmd/Ctrl held lends the Selection tool, whose bounding box shows while the key is down over objects selected whole; its handles scale and rotate, and a Cmd drag moves the whole object with its direct-selected anchors kept (#3901); scores and estimates unchanged |
 | 2026-11-05 | minor | Join tool: scrubbing over the ends of two crossing open paths that run past the crossing trims those ends and joins the paths there with a corner, instead of drawing a segment between the ends (#5844); scores and estimates unchanged |
 | 2026-11-05 | minor | Effect dialogs: a swatch beside a hex colour field follows typed values, and a double-click opens the Color Picker over the dialog, whose OK fills the field (#5365); scores and estimates unchanged |
@@ -135,6 +136,7 @@ tools, never checked side by side) isn't captured row by row.
 | Layers panel lists a blend's spine (#4820) | done | an open blend shows a `<Path>` row below its key objects, where Release leaves the spine; a click selects the blend (Shift/Cmd toggles it) so Direct Selection edits the spine; a locked blend's row selects nothing; no row while searching or filtering (`a_blends_spine_is_a_row_below_its_keys_that_selects_the_blend`) |
 | Layers panel: a layer whose Layer Options › Print is off shows its name italic (#5739) | done | the panel row and its drag ghost; a printing layer stays upright, and Print on again restores it; `panels::layers` test `a_layer_that_does_not_print_has_its_name_italic` |
 | Blend spine Anchor Point conversion and handle editing (#2544) | implemented | symmetric handles, independent drag/retraction, visible-handle policy and selection/stacking covered by tool and engine regressions; Windows native canvas checks and screenshots reviewed in PR #2643 |
+| Several blend spine points picked and dragged together (#5285) | done | with Direct Selection, Shift-click picks more points of a selected blend's spine or takes one away, as on a path; dragging any picked point moves them all, and the key objects on them, in one undo step (`object.blend.spine.moveAnchor {with}`); a marquee doesn't pick spine points yet |
 | Add/Delete/Anchor Point tools; Anchor Point tool drags segments to reshape | done | #2267: a click on a handle end retracts that handle and leaves the anchor a corner with the other one; Shift held at the press on an anchor moves it, handles and all (Shift kept down: at 45° steps) instead of pulling out handles |
 | Pencil: Fidelity, Keep selected, Alt to Smooth, edit selected paths, close by proximity | done | Fidelity goes down to 0.01 pt in the dialog, the tool and `path.freehand` (the Smooth tool keeps 0.05); its slider runs across the Tool Options row on a logarithmic rail from 0.01 to 20 pt, the field shows hundredths, and the slider's and the field's arrow keys step hundredths up to 0.1 pt, tenths up to 1 pt and whole points above (Shift ×10) (#3328); Alt key toggles to Smooth Tool (#2001); Shift held at the press draws a straight line at 45° steps from the Constrain Angle, and Alt held at the press (with Alt key toggles to Smooth Tool off) a straight line at any angle (#3799), with a straight-line cursor while Shift or Alt is held before the press, and a path-continuation cursor over an end of a selected open path, where the line continues the path; Edit Selected Paths continues a selected path from an end and, from a stroke that starts and ends on a selected path, redraws the section between (the shorter way round a closed path, #2850); with Keep selected (Pencil and Paintbrush, on by default) on, a stroke selects the path it draws or continues and replaces the earlier selection, and off a new stroke leaves nothing selected, the earlier selection included, while a continued or redrawn path is deselected and the rest of the selection stays; a filled Pencil path keeps a stroke of None (#1804, part of #1679); while a freehand stroke is drawn back to within Close Paths When Ends Are Within of its start, the Pencil and the Paintbrush show the closing cursor, and a release there closes the path |
 | Pencil: Fidelity, Keep selected, Alt to Smooth, edit selected paths, close by proximity | done | Alt key toggles to Smooth Tool (#2001); Shift held at the press draws a straight line at 45° steps from the Constrain Angle, and Alt held at the press (with Alt key toggles to Smooth Tool off) a straight line at any angle (#3799), with a straight-line cursor while Shift or Alt is held before the press, and a path-continuation cursor over an end of a selected open path, where the line continues the path; Edit Selected Paths continues a selected path from an end and, from a stroke that starts and ends on a selected path, redraws the section between (the shorter way round a closed path, #2850); with Keep selected (Pencil and Paintbrush, on by default) on, a stroke selects the path it draws or continues and replaces the earlier selection, and off a new stroke leaves nothing selected, the earlier selection included, while a continued or redrawn path is deselected and the rest of the selection stays; a filled Pencil path keeps a stroke of None (#1804, part of #1679); while a freehand stroke is drawn back to within Close Paths When Ends Are Within of its start, the Pencil and the Paintbrush show the closing cursor, and a release there closes the path; a Pencil stroke from an end of one selected open path to an end of another connects the two into one path |