Smooth: the slider smooths bumps and jags into curves, and smooths only a direct-selected section

docs/mcp.md

@@ -2711,9 +2711,10 @@ the dialog on those settings next time.
 
 `object.path.smooth` smooths the selected paths (or the objects in `ids`), compound path members included, as one undo
 step. `level` is the Smooth slider's, a whole number from 0 (minimum smoothing: the path stays within 0.1% of its longer
-side) to 100 (maximum smoothing); `auto: true` (Auto-Smooth) uses level 50, the default. Each path is refitted with
-curves within 0.1% to 2.5% of its longer side, keeping a corner only where it turns back on itself, so jags and kinks
-become curves; a refit never has more anchor points than the path had, so a shape whose corners the tolerance can't
+side) to 100 (maximum smoothing); `auto: true` (Auto-Smooth) uses level 50, the default. Each path is smoothed along
+its length (by up to 5% of its longer side; none at level 0) and refitted with curves within 0.1% to 2.5% of it,
+keeping a corner only where it turns back on itself, so bumps, jags and kinks become one curve; with anchor points or
+segments of a path direct-selected (and no `ids`), only the sections between them are smoothed, as Simplify does. A refit never has more anchor points than the path had, so a shape whose corners the tolerance can't
 round, such as a rectangle, stays as it is. Closed paths stay closed and open paths keep their end points. The reply has the anchor counts `before` and `after` and the `level` used:
 
 ```json

docs/target-app-parity.md

@@ -19,6 +19,7 @@ Artboard Options forwards the active Artboard tool's Scale Artwork with Artboard
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-31 | minor | Object › Path › Smooth smooths a path along its length before refitting it, so Auto-Smooth takes a shaky line to one smooth curve instead of leaving its jags, and with anchor points direct-selected it smooths only that section; scores unchanged. |
 | 2026-10-31 | minor | New Document: More Settings has the Save Preset button beside the name too, saving its settings (artboard layout included) as a preset (#4893); scores unchanged. |
 | 2026-10-31 | minor | Object › Rasterize in a CMYK document with its CMYK colour model makes a CMYK image of the art's ink amounts (as CMYK exports draw them), so the Properties panel says CMYK and CMYK exports keep its inks; a transparent background becomes the image's opacity mask (#4882); scores unchanged. |
 | 2026-10-31 | minor | Export for Screens is laid out as Illustrator's: Artboards and Assets tabs with a grid or list of thumbnails, Clear Selection and Prefix under them, Create Sub-folders by Scale or Format (on by default), Export PDFs As Single File or Multiple Files (`pdfs`), iOS and Android rows, the format presets in a ☰ menu, and a Selected / files-to-export count; the naming pattern, Layers and Selection pages and folders list stay in `document.exportForScreens` for scripts and MCP; scores unchanged. |
@@ -831,7 +832,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     The Simplify dialog also has Corner Point Angle Threshold, Convert to Straight Lines and Show Original Path. The threshold is a slider from 0° to 180° and opens at 150°: an anchor whose corner is sharper than the threshold stays a corner, so moving the slider right keeps more corners, and the dialog sends `cornerAngle` as 180° less the threshold. While Preview is on, Show Original Path draws the paths as they were before the preview in a wide, faint band of their layer's color under the selection's outlines.
     Object › Path › Simplify opens a slider under the selection ([Manually simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/manually-simplify-paths.html), [Auto simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/auto-simplify-paths.html)) with Auto-Simplify, a rail from the fewest anchor points to the closest fit, and More Options, which opens the dialog at the slider's tolerance. The rail's levels are VectorCraft's own scale (`object.path.simplify {level}`): level 50 is 1 pt, and every 10 levels halve or double the tolerance, from 32 pt at 0 to 1/32 pt at 100. Auto-Simplify picks the lowest level whose tolerance is at most 1/400 of the selection's longer side, or level 100 when that side is under 12.5 pt; the slider opens at that level, with its result previewed, as the manual-simplify page describes. The dialog's "Open this dialog with these settings next time" makes the menu item open the dialog on the settings of its last OK.
     With anchors or segments of a path selected with Direct Selection, Simplify acts on just that part of the path, as the [Manually simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/manually-simplify-paths.html) page puts it: the slider, Auto-Simplify and the dialog refit only each run of selected segments, between its end anchors, which keep their place and their handles on the side away from the run. The anchors and segments outside the runs stay exactly as they were, a closed path's run may cross its start point, separate runs on one path are refitted independently in one undo step, and the runs stay selected. A path with only lone anchors selected is still simplified whole, and `object.path.simplify {wholePaths: true}` simplifies partly selected paths whole. Tests: `crates/engine/src/tests/simplify_part.rs` and `simplify_slider_and_dialog_simplify_only_the_direct_selected_part_of_a_path`.
-    Object › Path › Smooth… (#4115) opens a slider under the selection from Minimum to Maximum smoothing with an Auto-Smooth button, as the [Smooth slider](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/refine-path-segments-with-the-smooth-slider.html) page describes; the canvas previews it and Enter or a click outside keeps it as one undo step (`object.path.smooth {level, auto, ids}`). The page names only the ends, so the rest is VectorCraft's own rule: each selected path, compound path members included, is refitted with curves within 0.1% (level 0) to 2.5% (level 100) of its longer side, corners kept only where it turns back and never with more anchors (a rectangle stays as it is); Auto-Smooth is level 50. Closed paths stay closed and open ones keep their end points. Tests: `crates/engine/src/tests/smooth_path.rs` and `smooth_slider_previews_auto_smooth_and_keeps_the_result`.
+    Object › Path › Smooth… (#4115) opens a slider under the selection from Minimum to Maximum smoothing with an Auto-Smooth button, as the [Smooth slider](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/refine-path-segments-with-the-smooth-slider.html) page describes; the canvas previews it and Enter or a click outside keeps it as one undo step (`object.path.smooth {level, auto, ids}`). The page names only the ends, so the rest is VectorCraft's own rule: each selected path, compound path members included, is smoothed along its length (by up to 5% of its longer side, so a shaky line comes out as one curve at Auto-Smooth) and refitted with curves within 0.1% (level 0) to 2.5% (level 100) of it, corners kept only where it turns back and never with more anchors (a rectangle stays as it is); Auto-Smooth is level 50. With anchor points of a path direct-selected, only the section between them is smoothed. Closed paths stay closed and open ones keep their end points. Tests: `crates/engine/src/tests/smooth_path.rs` and `smooth_slider_previews_auto_smooth_and_keeps_the_result`.
 - **Devanagari shaping:** with an OpenType Devanagari font, Ka, virama and Ssa (क्ष) form one conjunct glyph, Ra and virama before a consonant (र्क) become a reph drawn after it, the i matra (कि) is drawn before its consonant, and Ka with a nukta is drawn like the precomposed क़ (U+0958), as [Microsoft's Devanagari shaping specification](https://learn.microsoft.com/en-us/typography/script-development/devanagari) describes. Each syllable is one cluster of its source bytes, and the arrow keys stop at its ends. A click inside a syllable drawn with several glyphs puts the caret at the syllable's nearer end, in point, area and path type. Tests: `crates/text/src/tests/devanagari.rs`; they print SKIPPED when no such font is installed.
 - **Vertical type spacing shortcuts:** The [Default keyboard shortcuts](https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page gives Alt+Down/Up for kerning at a caret or tracking of selected text, Alt+Left/Right for leading, and Alt+Shift+Right/Left for baseline shift. Alt+Shift+Down/Up also steps kerning or tracking. Down increases kerning or tracking, Left increases leading, and Shift+Right increases baseline shift; the opposite arrows decrease them. Cmd/Ctrl makes five steps. Horizontal type keeps its existing mapping; mixed horizontal and vertical text-object selections take the horizontal mapping for both objects in one undo step. Selected vertical point, area and path type use the same directions. Tests: `spacing_arrows_follow_each_text_objects_orientation`, `alt_arrows_rotate_for_selected_vertical_type`, `mixed_type_objects_take_horizontal_spacing_chords_in_both_orders`, and `selected_vertical_area_and_path_type_use_vertical_spacing_chords`.
 - **Vertical punctuation:** fullwidth `！` (U+FF01) and `？` (U+FF1F) use their nominal glyph upright when no vertical alternate is present, following the Tu fallback in [Unicode UAX #50 §3.1](https://www.unicode.org/reports/tr50/#vo). Code-built test fonts cover point and area type with and without `vert` alternates, retain the rotated fallback for a bracket and long vowel mark, and leave horizontal type unchanged. Tests: `crates/text/src/tests/vertical.rs`.

docs/ui-parity.md

@@ -99,7 +99,7 @@ tools, never checked side by side) isn't captured row by row.
 | Smooth tool smooths only the stretch of path under the drag | done | #1512 |
 | Drawing modes apply to pastes: Draw Inside takes Paste, Paste in Place and Paste on All Artboards inside the object; Draw Behind puts Paste in Place and Paste on All Artboards behind the selection; Shift+D cycles past Draw Behind with any selection ([drawing modes](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/learn-drawing-basics/drawing-modes-overview.html)) | done | #3705; `pasting_in_draw_inside_puts_the_copies_inside_the_object`, `paste_in_place_in_draw_behind_goes_behind_the_selection`, `shift_d_goes_past_draw_behind_whatever_is_selected` |
 | Simplify (slider, auto, corner angle threshold), of a whole path or of the part of it selected with Direct Selection ([manually simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/manually-simplify-paths.html)) | done | Tolerance, default-on Preview and original/new point counts (#1272); Corner Point Angle Threshold, Convert to Straight Lines and Show Original Path; the slider under the selection with Auto-Simplify and More Options, opening at the Auto-Simplify level for the selection with that result previewed, and the dialog's option to open it directly with its last settings. With anchors or segments direct-selected, the slider, Auto-Simplify and the dialog refit only each run of selected segments between its end anchors, a closed path's run across its start point included; the rest of the path stays exactly as it was (`tests/simplify_part.rs`, `simplify_slider_and_dialog_simplify_only_the_direct_selected_part_of_a_path`) |
-| Smooth (Object › Path › Smooth…: slider from minimum to maximum smoothing, Auto-Smooth) ([smooth slider](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/refine-path-segments-with-the-smooth-slider.html)) | done | #4115: the slider under the selection previews `object.path.smooth {level}`, Auto-Smooth picks level 50, Enter or a click outside keeps one undo step and Escape restores; the smoothing rule beyond the two ends is VectorCraft's own (`tests/smooth_path.rs`, `smooth_slider_previews_auto_smooth_and_keeps_the_result`) |
+| Smooth (Object › Path › Smooth…: slider from minimum to maximum smoothing, Auto-Smooth) ([smooth slider](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/refine-path-segments-with-the-smooth-slider.html)) | done | #4115: the slider under the selection previews `object.path.smooth {level}`, Auto-Smooth picks level 50 and takes a shaky line to one smooth curve, direct-selected anchors smooth only their section, Enter or a click outside keeps one undo step and Escape restores; the smoothing rule beyond the two ends is VectorCraft's own (`tests/smooth_path.rs`, `smooth_slider_previews_auto_smooth_and_keeps_the_result`) |
 | Draw Inside in isolation mode: art drawn or pasted inside the isolated object takes isolation mode into its clip group, clickable and undimmed ([isolation mode](https://helpx.adobe.com/illustrator/desktop/manage-objects/select-objects/isolate-objects.html), [drawing modes](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/learn-drawing-basics/drawing-modes-overview.html)) | done | #3705; `drawing_inside_an_isolated_object_keeps_the_new_art_in_isolation_mode` |
 | Draw Inside marks the object it draws into: a dotted open rectangle round its corners, in its layer's colour, while the mode lasts, selected or not | done | #4319, `canvas::tests::draw_inside_marks_the_corners_of_its_object` ([drawing modes](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/learn-drawing-basics/drawing-modes-overview.html)) |
 | Simplify (slider, auto, corner angle threshold) | partial | Tolerance, default-on Preview and original/new point counts (#1272); Corner Point Angle Threshold, Convert to Straight Lines and Show Original Path; the slider under the selection with Auto-Simplify and More Options, and the dialog's option to open it directly with its last settings; the slider opens at 1 pt rather than at the Auto-Simplify level, and simplifying only a Direct Selection part of a path remains missing |
@@ -379,6 +379,7 @@ separate. Scores and hours unchanged. [Behavior and command details](development
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-31 | minor | Object › Path › Smooth: Auto-Smooth takes a shaky line to one smooth curve, and direct-selected anchors smooth only their section; scores unchanged |
 | 2026-10-31 | minor | New Document: More Settings has Save Preset beside the name, as Preset Details does, and saves its settings (#4893); scores and estimates unchanged |
 | 2026-10-31 | minor | Export for Screens is laid out as the reference app's: Artboards and Assets tabs with a grid or list of thumbnails, Clear Selection and Prefix under them, Create Sub-folders by Scale or Format (on by default), Export PDFs As Single File or Multiple Files (`pdfs`), iOS and Android rows, the format presets in a ☰ menu, and a Selected / files-to-export count; the naming pattern, Layers and Selection pages and folders list stay in `document.exportForScreens` for scripts and MCP; scores unchanged |
 | 2026-10-31 | minor | Direct Selection: with Alt held at the press, a marquee selects every path it touches whole and keeps the Group Selection pointer while dragging (#4890); a click on a selected object's centre point (Show Center) selects the object whole, and a drag from it moves the object (#4891); scores unchanged |