Path: Object › Path › Smooth smooths the selected paths with a slider and Auto-Smooth (#4115)

docs/mcp.md

@@ -2569,6 +2569,23 @@ dialog `simplifySlider` with field `level`) at the Auto-Simplify level for the s
 opens the Simplify dialog at the slider's tolerance. When OK confirms the dialog with `retain` ticked, the menu item opens
 the dialog on those settings next time.
 
+## Smooth
+
+`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
+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
+{"name":"run_command","arguments":{"command":"object.path.smooth","params":{"level":80}}}
+```
+
+In the desktop app, Object › Path › Smooth opens the slider (`ui.menuDialog {command: "object.path.smooth"}`, dialog
+`smoothSlider` with field `level`) at the Auto-Smooth level and previews the result until `ui.dialog.confirm`;
+`ui.smoothAuto` moves the open slider back to the Auto-Smooth level.
+
 ## Editing a path with the Curvature tool
 
 The Curvature tool edits any selected path, whatever drew it, keeping its shape except where edited (#798). Each edit

docs/target-app-parity.md

@@ -786,6 +786,7 @@ 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`.
 - **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 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`.
   - Free Distort's dialog (Effect › Distort & Transform › Free Distort…) shows a box in the proportions of the first selected object's bounds with a handle on each corner. Dragging a handle moves that corner. A handle focused by a click or Tab moves 1% of the box with each arrow key, and 10% with Shift. Reset puts the four corners back on the box. The preview and OK run `effect.apply`, or `effect.setParams` when the dialog edits an applied effect, and the Appearance panel's inline editor opens the dialog with Edit…. Behavior reference: Illustrator CC Help (2014, [PDF](https://help.adobe.com/archive/en/illustrator/cc/2014/illustrator_reference.pdf)), page 285 (PDF page 291).
@@ -1168,6 +1169,7 @@ applies to fills). Tests: `color::gradient::tests` (perceptual midpoint, expansi
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-29 | minor | Object › Path › Smooth… with its slider and Auto-Smooth (#4115) added to the evidence; score and hours unchanged. |
 | 2026-10-26 | minor | File formats: EPS Save and Save As: an opened EPS saves back to its own path as EPS, keeping the chosen artboard's page frame and transparent margins and the complete editable VectorCraft document; Save's TIFF preview is capped at 1024 px (Export keeps 2048); partly read, preview-only or damaged-editing-data sources still need confirmation before they are overwritten; evidence added ([file-format-parity.md](file-format-parity.md#eps-save-and-source-protection)); writing Illustrator's editing data (#868) and the `.ai` structure issues stay in the missing items; score and hours unchanged (estimated) |
 | 2026-10-26 | minor | View & navigation: New View… / Edit Views… taken off the missing items (all 25 saved views in the View menu, an Edit Views… list dialog, views checked on open); evidence added; score and hours unchanged. |
 | 2026-10-25 | minor | Type core: a double-click on a threaded port breaks the thread there (`text.thread.break`); evidence added; scores unchanged. |

docs/ui-parity.md

@@ -99,6 +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`) |
 | 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` |
 | 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 |
 | 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, 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; simplifying only a Direct Selection part of a path remains missing |
@@ -357,6 +358,7 @@ separate. Scores and hours unchanged. [Behavior and command details](development
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-29 | minor | Object › Path › Smooth… with its slider and Auto-Smooth (#4115); scores and estimates unchanged |
 | 2026-10-25 | minor | Selection tool: a double-click on a threaded port breaks the thread there (`text.thread.break`); scores and estimates unchanged |
 | 2026-10-25 | minor | A selected Grid Repeat shows handles: the one below the grid adds or removes rows, the one right of it columns, the one past its bottom-right corner both, and the sliders between the first two columns and rows set the horizontal and vertical spacing; each drag is one undo step and Escape cancels it (#2691); headless canvas and tool regressions; scores and estimates unchanged. |
 | 2026-10-25 | minor | Floating panels open in OS windows of their own on the desktop (inside the window on the web and on Wayland); saved layouts from earlier versions convert to the shared docking layout (#4135); scores and estimates unchanged (estimated) |