fix: 線の色追加時にゼロ幅を既定値へ戻す #1253

crates/engine/src/cmd/paint.rs

@@ -446,6 +446,9 @@ fn apply_paint(s: &mut Session, p: &Value, paint: Paint, fill: bool) -> Result<V
             if n.appearance.paint_at(index, fill).is_none() {
                 n.appearance.set_paint_at(index, fill, Paint::None);
             }
+            if !fill {
+                restore_unpainted_stroke(&mut n.appearance, index, &paint);
+            }
             let placed = place_paint(&paint, p, item_paint_bounds(n, index, fill));
             n.appearance.set_paint_at(index, fill, placed);
             Ok(())
@@ -470,6 +473,9 @@ fn apply_paint(s: &mut Session, p: &Value, paint: Paint, fill: bool) -> Result<V
     if fill {
         s.paint.fill = unplaced(&paint);
     } else {
+        if !paint.is_none() && s.paint.stroke.is_none() && s.paint.stroke_width == 0.0 {
+            s.paint.stroke_width = 1.0;
+        }
         s.paint.stroke = unplaced(&paint);
     }
     if bool_or(p, "focus", true) {
@@ -495,6 +501,17 @@ fn set_run_stroke(style: &mut CharStyle, paint: Paint) {
     style.stroke = paint;
 }
 
+/// Use the existing 1 pt default when adding paint to an unpainted zero-width stroke.
+fn restore_unpainted_stroke(ap: &mut Appearance, index: Option<usize>, paint: &Paint) {
+    if !paint.is_none()
+        && let Some(stroke) = ap.stroke_at_mut(index)
+        && stroke.paint.is_none()
+        && stroke.width == 0.0
+    {
+        stroke.width = 1.0;
+    }
+}
+
 fn swap(s: &mut Session, p: &Value) -> Result<Value> {
     let ids = paint_targets(s, p)?;
     if !ids.is_empty() {
@@ -512,11 +529,15 @@ fn swap(s: &mut Session, p: &Value) -> Result<Value> {
                 let f = n.appearance.fill_paint();
                 let st = n.appearance.stroke_paint();
                 n.appearance.set_fill(st);
+                restore_unpainted_stroke(&mut n.appearance, None, &f);
                 n.appearance.set_stroke(f);
             }
             Ok(())
         })?;
     }
+    if s.paint.stroke.is_none() && !s.paint.fill.is_none() && s.paint.stroke_width == 0.0 {
+        s.paint.stroke_width = 1.0;
+    }
     std::mem::swap(&mut s.paint.fill, &mut s.paint.stroke);
     ok()
 }

crates/engine/tests/stroke_visibility.rs

@@ -0,0 +1,107 @@
+//! Painting a previously unpainted zero-width stroke restores the existing 1 pt default.
+#![allow(clippy::unwrap_used)]
+
+use serde_json::json;
+use vectorcraft_doc::NodeId;
+use vectorcraft_engine::{Session, ViewInfo};
+use vectorcraft_tools::{PointerEvent, PointerKind};
+
+fn fixture() -> (Session, NodeId) {
+    let mut s = Session::new();
+    s.execute("file.new", &json!({"width": 400, "height": 300})).unwrap();
+    let id = rectangle(&mut s, 10.0);
+    (s, id)
+}
+
+fn rectangle(s: &mut Session, x: f64) -> NodeId {
+    NodeId(s.execute("shape.rectangle", &json!({"x": x, "y": 10, "width": 50, "height": 40})).unwrap()["id"].as_u64().unwrap())
+}
+
+fn width(s: &Session, id: NodeId) -> f64 {
+    s.doc().unwrap().doc.node(id).unwrap().appearance.stroke().unwrap().width
+}
+
+#[test]
+fn adding_a_stroke_after_sampling_strokeless_art_makes_it_visible_in_one_undo_step() {
+    let (mut s, _) = fixture();
+    s.execute("paint.setStroke", &json!({"none": true})).unwrap();
+    s.execute("select.set", &json!({"ids": []})).unwrap();
+    s.select_tool("eyedropper", ViewInfo::default()).unwrap();
+    s.pointer(&PointerEvent::new(PointerKind::Down, 25.0, 25.0), ViewInfo::default()).unwrap();
+    let id = rectangle(&mut s, 100.0);
+    assert_eq!(width(&s, id), 0.0, "sampled None paint is a normal source of a zero-width stroke");
+    let st = s.doc().unwrap();
+    let before = st.doc.clone();
+    let sel = st.selection.clone();
+    let history = st.history.undo.len();
+    let geometry = st.doc.node(id).unwrap().geometric_bounds();
+    s.execute("paint.setStroke", &json!({"color": "#ee2222"})).unwrap();
+    assert_eq!(width(&s, id), 1.0);
+    let st = s.doc().unwrap();
+    assert_eq!(st.doc.node(id).unwrap().geometric_bounds(), geometry);
+    assert_eq!(json!(st.selection), json!(sel));
+    assert_eq!(st.history.undo.len(), history + 1);
+    let after = st.doc.clone();
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(json!(s.doc().unwrap().doc), json!(before));
+    s.execute("edit.redo", &json!({})).unwrap();
+    assert_eq!(json!(s.doc().unwrap().doc), json!(after));
+}
+
+#[test]
+fn adding_stroke_paint_to_the_defaults_gives_the_next_shape_a_visible_stroke() {
+    let (mut s, _) = fixture();
+    s.execute("select.set", &json!({"ids": []})).unwrap();
+    s.execute("paint.setStroke", &json!({"none": true})).unwrap();
+    s.execute("stroke.set", &json!({"weight": 0})).unwrap();
+    s.execute("paint.setStroke", &json!({"color": "#ee2222"})).unwrap();
+    assert_eq!(s.new_art_stroke().width, 1.0);
+    let id = rectangle(&mut s, 100.0);
+    assert_eq!(width(&s, id), 1.0);
+}
+
+#[test]
+fn swapping_fill_into_an_unpainted_zero_width_stroke_makes_it_visible() {
+    let (mut s, id) = fixture();
+    s.execute("paint.setStroke", &json!({"none": true})).unwrap();
+    s.execute("stroke.set", &json!({"weight": 0})).unwrap();
+    let fill = s.doc().unwrap().doc.node(id).unwrap().appearance.fill_paint();
+    s.execute("paint.swap", &json!({})).unwrap();
+    let n = s.doc().unwrap().doc.node(id).unwrap();
+    assert!(n.appearance.fill_paint().is_none());
+    assert_eq!(n.appearance.stroke_paint(), fill);
+    assert_eq!(width(&s, id), 1.0);
+    assert_eq!(s.new_art_stroke().width, 1.0);
+}
+
+#[test]
+fn a_targeted_stroke_is_restored_without_changing_the_other_stroke() {
+    let (mut s, id) = fixture();
+    s.execute("stroke.set", &json!({"weight": 5})).unwrap();
+    s.execute("appearance.addStroke", &json!({})).unwrap();
+    s.execute("paint.setStroke", &json!({"item": 1, "none": true})).unwrap();
+    s.execute("stroke.set", &json!({"item": 1, "weight": 0})).unwrap();
+    s.execute("paint.setStroke", &json!({"item": 1, "color": "#ee2222"})).unwrap();
+    let ap = &s.doc().unwrap().doc.node(id).unwrap().appearance;
+    assert_eq!(ap.stroke_at(Some(1)).unwrap().width, 1.0);
+    assert_eq!(ap.stroke_at(Some(2)).unwrap().width, 5.0);
+}
+
+#[test]
+fn existing_weights_and_explicitly_zero_painted_strokes_keep_their_widths() {
+    for (was_none, weight) in [(true, 5.0), (false, 5.0), (false, 0.0)] {
+        let (mut s, id) = fixture();
+        if was_none {
+            s.execute("paint.setStroke", &json!({"none": true})).unwrap();
+        }
+        s.execute("stroke.set", &json!({"weight": weight})).unwrap();
+        s.execute("paint.setStroke", &json!({"color": "#ee2222"})).unwrap();
+        assert_eq!(width(&s, id), weight);
+    }
+    let (mut s, id) = fixture();
+    s.execute("paint.setStroke", &json!({"none": true})).unwrap();
+    s.execute("stroke.set", &json!({"weight": 0})).unwrap();
+    s.execute("paint.setFill", &json!({"color": "#ffaa00"})).unwrap();
+    s.execute("paint.setStroke", &json!({"none": true})).unwrap();
+    assert_eq!(width(&s, id), 0.0, "fill edits and removing paint do not enable a stroke");
+}

docs/gaps.md

@@ -1,6 +1,6 @@
 # Gaps
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (G15: large-selection edits, cached live effects and faster Pathfinder, #1173; G4: proportional vertical metrics done, #966; G11: Shape Builder merge seams on grids of lines fixed, #893; scaled text controls corrected, #1034; group font-size preservation deferred) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (G1: painted strokes regain the existing default after None/zero-width inheritance (#1253); estimate unchanged; G15: large-selection edits, cached live effects and faster Pathfinder, #1173; G4: proportional vertical metrics done, #966; G11: Shape Builder merge seams on grids of lines fixed, #893; scaled text controls corrected, #1034; group font-size preservation deferred) · **Target:** Adobe Illustrator 2026 (30.x)
 
 Every known shortfall against Illustrator, one entry each, **ranked by how much it stops a professional from
 switching**. This is the work list: unless you were given a task, pick the highest-ranked gap you can make
@@ -43,6 +43,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
 
 ## G1 Interaction fidelity
 
+- **Done (#1253):** adding paint to an unpainted zero-width stroke restores the existing 1 pt default, including new-art defaults and Swap Fill/Stroke. The real Eyedropper inheritance sequence, targeted appearance items, preserved widths and Undo/Redo have regression coverage.
 - **Missing:** a tool-by-tool, panel-by-panel pass over modifiers, cursors, the Properties panel per context,
   isolation mode and small behaviours, against the public tool and shortcut documentation. Itemized in
   [ui-parity.md](ui-parity.md). The Shaper's construction-mode widget and gesture refinements remain.
@@ -204,6 +205,7 @@ from G14 and the budget run of G15: **~170–270 h** one agent, ~50–80 h wall
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | G1: painted strokes regain the existing default after None/zero-width inheritance (#1253); estimate unchanged |
 | 2026-10-11 | minor | G15: large-selection edits, cached live effects and faster Pathfinder (#1173); a 25k-path perf run meets every budget; estimate unchanged |
 | 2026-10-11 | minor | G4: Middle Eastern digit types done (Character panel menu › Digits); estimate unchanged |
 | 2026-10-11 | minor | G4: proportional vertical metrics (#966) done; estimate unchanged |

docs/roadmap.md

@@ -1,6 +1,6 @@
 # Roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (M12: graph designs, graph data, Graph Type and label options; M14: native macOS save Format menu, #866; M6: compound appearance and member fill-rule fixes, #1197; estimates unchanged; M9: PDF raster-effect cap warnings; G11: #893 fixed, #937 open; M7: accurate character controls after scaling, #1034; estimates unchanged) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (M3: adding paint to an unpainted zero-width stroke restores 1 pt (#1253); estimates unchanged; M12: graph designs, graph data, Graph Type and label options; M14: native macOS save Format menu, #866; M6: compound appearance and member fill-rule fixes, #1197; estimates unchanged; M9: PDF raster-effect cap warnings; G11: #893 fixed, #937 open; M7: accurate character controls after scaling, #1034; estimates unchanged) · **Target:** Adobe Illustrator 2026 (30.x)
 
 Forward-looking plan. Where VectorCraft stands is in [`ROADMAP.md`](../ROADMAP.md) and
 [target-app-parity.md](target-app-parity.md); the ranked work list is [gaps.md](gaps.md). Hours are Opus 5.5
@@ -50,7 +50,7 @@ Checked 2026-10-10 from the code, tests and open issues; no workflow fails, so V
 | M0 | Skeleton + vertical slice | ✅ done | — |
 | M1 | Selection, transform, layers, MCP (common command tools, strict keys, session resources and version-aware result hints) | ✅ mostly done (transform reference point snaps to anchors/centres; rotated objects keep a rotated bounding box and their angle; Free Transform, Scale and Reflect along a rotated box pending) | 4–6 |
 | M2 | Drawing tools + smart guides | ✅ mostly done (Flare, Reshape, Live Corners widget dragging and per-corner radii and kinds landed, on any path's corners; Shaper rough-shape recognition and orientation steps, the remaining Pen modifier nuances; Shaper Groups with editable sources and separate fill/stroke edits landed; construction widget/refinements pending) | 12–18 |
-| M3 | Paint & appearance (swatches, color, gradient, stroke, appearance, transparency, styles) | ✅ done (M3.7–M3.98): swatches, groups, libraries, tints, Lab spots and Registration; Color Picker, Color panel, Color Guide, Color Themes, Edit Colors and Recolor Artwork; gradients that follow every transform, the annotator, linked stops, freeform gradients, focal points, gradients on strokes and Expand; stroke geometry, arrowheads, dashes fitted to corners, stroke on type, width profiles and the Width tool, Scale Strokes and preview bounds; Appearance targeting, container appearance, target circles, Expand Appearance; knockout, isolation, blend accuracy, CMYK blending, overprint, Attributes, masks and clipping, Flatten Transparency; graphic styles, links and libraries. Left: freeform and mixed spot/process gradients export as stops or process colours to SVG/PDF; confirm the Scale Strokes & Effects default | 4–8 |
+| M3 | Paint & appearance (swatches, color, gradient, stroke, appearance, transparency, styles) | ✅ done (M3.7–M3.98): swatches, groups, libraries, tints, Lab spots and Registration; Color Picker, Color panel, Color Guide, Color Themes, Edit Colors and Recolor Artwork; gradients that follow every transform, the annotator, linked stops, freeform gradients, focal points, gradients on strokes and Expand; visible strokes when paint is added to inherited None/zero-width art (#1253); stroke geometry, arrowheads, dashes fitted to corners, stroke on type, width profiles and the Width tool, Scale Strokes and preview bounds; Appearance targeting, container appearance, target circles, Expand Appearance; knockout, isolation, blend accuracy, CMYK blending, overprint, Attributes, masks and clipping, Flatten Transparency; graphic styles, links and libraries. Left: freeform and mixed spot/process gradients export as stops or process colours to SVG/PDF; confirm the Scale Strokes & Effects default | 4–8 |
 | M4 | Files (native, SVG, PDF, raster, Export for Screens, clipboard interop) | ✅ done (M4.14–M4.98 on 2026-10-05): Save As/Save a Copy/Revert/templates, Data Recovery and background save, SVG import and export fidelity (units, text, symbols, filters, SVGZ, Preserve Editing, SVG Options), PDF import (colours, layers, masks, editable text, security) and export (presets, marks, bleed, ICC and output intent, raster effects, subset fonts, PDF/X-1a, X-3 and X-4, PDF layers, overprint, page thumbnails, fast web view, PDF 1.3), Place and Links, Package, EPS and DXF in and out, EMF/WMF, TIFF/BMP/Targa/PSD/GIF/PNG-8 export, Print and print presets, slices, Save for Web, Asset Export, clipboard flavours, File Info; AF.1–AF.4 add Affinity import (native layers, artboards, vectors, text and images from Affinity 1–3 files; the embedded preview only as a warned fallback; AF.4 expands current `.af` fixtures and every-board round-trip validation). Left: DWG (use DXF), PSD placement as layers, overprint read back from PDF, Affinity export, polish | 3–6 (existing scope; Affinity export unestimated) |
 | M5 | Performance | 🟡 background render + caches + MT done; `vectorcraft-cli bench` and `vectorcraft-cli perf` (budget suite); file format v2 opens 3× faster (50k paths: 722 → 244 ms); raster effects (glows, shadows, blur, feather) no longer force the whole frame single-threaded (filtered offscreen per effect, verified equal to the single-threaded reference); effect-heavy demos need a clean-machine benchmark; dirty-region rendering, GPU backend spike pending | 15–25 |
 | M6 | Path operations (Pathfinder, Shape Builder, offset…) | ✅ mostly done (Compound appearance and member fill-rule edits verified (#1197); Boolean precision on almost-horizontal edges fixed and the property tests made deterministic; Shape Builder gap detection, large-offset bug open) | 3–6 |
@@ -79,6 +79,7 @@ After placed documents (File › Place of a `.vectorcraft` file, linked), M4.14
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | M3: adding paint to an unpainted zero-width stroke restores 1 pt (#1253); estimates unchanged |
 | 2026-10-11 | minor | M12: the Graph Data worksheet. Scores/hours unchanged. |
 | 2026-10-11 | minor | M12: graph label formatting kept through regeneration. Scores/hours unchanged. |
 | 2026-10-11 | minor | M12: Graph Type's widths past 100%, First Row/Column in Front, Draw Filled Lines. Scores/hours unchanged. |

docs/target-app-parity.md

@@ -1,6 +1,6 @@
 # Parity with Adobe Illustrator
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (graphs: designs and markers, data, Graph Type and label options; UI chrome: native macOS save Format menu, #866, scores unchanged; compound paths inherit the backmost appearance and member fill-rule edits reach their owner, #1197; scores unchanged; Type core: Middle Eastern digit types done, Character panel menu › Digits; PDF export warns when the pixel cap lowers raster-effect resolution; Drawing tools: Live Corners round corners between curved sides, #1144; Type advanced: proportional vertical metrics (`vpal`) done, #966; Shape Builder: #893 fixed, merged regions of crossing lines no longer keep seams; scores unchanged while #937 is open; #1034: document-point character controls after object/group scaling; full readiness recomputed as the standard's additive weighted sum, ~62%; per-audience hours; essentials-user score ~75% added; ready-for-real-work re-examined: 50% → 55%, mainstream 65% added; earlier the same day: full re-measure against Illustrator 2026 30.x; merged the ROADMAP's parity estimate, honest assessment and "Shipped so far" into this file) · **Target:** Adobe Illustrator 2026 (30.x; public release notes through 30.7, August 2026)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (Colour: unpainted zero-width strokes regain 1 pt when painted (#1253); scores and hours unchanged; graphs: designs and markers, data, Graph Type and label options; UI chrome: native macOS save Format menu, #866, scores unchanged; compound paths inherit the backmost appearance and member fill-rule edits reach their owner, #1197; scores unchanged; Type core: Middle Eastern digit types done, Character panel menu › Digits; PDF export warns when the pixel cap lowers raster-effect resolution; Drawing tools: Live Corners round corners between curved sides, #1144; Type advanced: proportional vertical metrics (`vpal`) done, #966; Shape Builder: #893 fixed, merged regions of crossing lines no longer keep seams; scores unchanged while #937 is open; #1034: document-point character controls after object/group scaling; full readiness recomputed as the standard's additive weighted sum, ~62%; per-audience hours; essentials-user score ~75% added; ready-for-real-work re-examined: 50% → 55%, mainstream 65% added; earlier the same day: full re-measure against Illustrator 2026 30.x; merged the ROADMAP's parity estimate, honest assessment and "Shipped so far" into this file) · **Target:** Adobe Illustrator 2026 (30.x; public release notes through 30.7, August 2026)
 
 The authoritative parity assessment. [`ROADMAP.md`](../ROADMAP.md) summarizes it; [`gaps.md`](gaps.md) is
 the work list made from it. Deep areas have their own checklists: [UI and interaction](ui-parity.md),
@@ -70,7 +70,7 @@ dominate; 3D, graphs and automation are specialist). They sum to 105. Feature de
 | Selection, transform & align tools | 6 | 85% | Free Transform/Scale/Reflect along a rotated box, Start Global Edit, transform nuances | 4–6 | estimated |
 | Drawing tools (Pen, Curvature, Pencil, shapes, Shaper) | 7 | 85% | Shaper construction widget, Pencil/Pen nuances, Blob Brush options, Touch Type, Dimension tool, Live Corners' Relative rounding; see [ui-parity.md](ui-parity.md) | 8–13 | estimated |
 | Path operations, Pathfinder, Shape Builder, Live Paint | 5 | 80% | Shape Builder misses planar regions in real files (#937), its gap detection and options; Live Paint Gap Options | 4–8 | estimated (lowered from 86%: open issues); compound attributes regression-tested (#1197) |
-| Colour, swatches, gradients, patterns, mesh, recolor | 7 | 92% | 30.0's gradient dither, perceptual blending and gradient presets; freeform and mixed spot/process gradients in SVG/PDF | 4–7 | estimated (lowered from 96%: target moved) |
+| Colour, swatches, gradients, patterns, mesh, recolor | 7 | 92% | 30.0's gradient dither, perceptual blending and gradient presets; freeform and mixed spot/process gradients in SVG/PDF | 4–7 | estimated (lowered from 96%: target moved); unpainted zero-width stroke restoration fixed (#1253), score and hours unchanged |
 | Strokes, brushes, width profiles | 5 | 88% | Art brush Overlap, Pattern brush auto corners, brush libraries, pen pressure on macOS, tilt/bearing/rotation | 8–15 | estimated |
 | Appearance, transparency, graphic styles, masks | 5 | 97% | raster effect reach in preview bounds | 1–2 | estimated |
 | Live vector effects | 5 | 85% | Outline Object, Effect › Rasterize, Pathfinder Hard Mix/Soft Mix/Trap, SVG Filters, the Transform effect's missing options (#885) | 6–10 | measured count 44/50, depth estimated |
@@ -438,6 +438,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
 - **Paint and appearance (M3):**
   - **Swatches:** names follow the colour model and are unique; Swatch Options (process/spot, Global, Gray/RGB/HSB/CMYK/Web, live preview); editing a global or spot swatch recolours every linked fill, stroke and text run in one undo step; multi-select and delete with confirmation; New Swatch and New Color Group dialogs (a group from the selected artwork's colours); swatches in colour groups convert, separate and count like any other. The Swatches panel selects ranges and whole groups, has a find field, and drags swatches to reorder, regroup or paint art; Add Used Colors, Select All Unused, Merge, Ungroup and Sort by Kind; a CMYK document keeps applied colours in CMYK. Swatch libraries: nine generated colour libraries and five gradient libraries in a library panel, saved as `.vcswatches`, `.gpl`, swatch exchange (`.ase`) or CSS, and loaded from `.vcswatches`, `.gpl` and `.ase` files (`.ase` both ways: RGB, CMYK, Lab and Gray; global, spot and process; groups) and from color books (`.acb`, read only: the RGB, CMYK or Lab colors of a book such as a Pantone book a user owns, named with its prefix and suffix, spot unless it says process, #831); `swatch.library.copyToUser` copies a loaded library into the User Defined folder without replacing a file, and a file with the same extension and bytes as a User Defined library opens as that library. Tints of global and spot colours ("Name 40%") stay linked and separate as a percentage of their plate. Spot colours can be defined in Lab (Spot Colors options). A built-in [Registration] swatch prints on every plate.
   - **Colour:** a Color Picker (colour field, H/S/B/R/G/B channel slider, HSB/RGB/Lab/CMYK fields, hex, web-only snapping, out-of-gamut correction); the Color panel follows each colour's own model and Alt-click paints the other proxy; proxies look through groups and show "?" for mixed paint; Invert, Complement, Apply Last Color (`,`) and Apply Last Gradient (`.`) keep the colour model; every paint command feeds the recent colours. The Color Guide has 21 harmony rules, Steps and Variation options and Limit to Library. Adjust Color Balance (its Global mode shifts tints) and Saturate preview live; Edit Colors and Recolor also reach meshes, images and patterns. Recolor Artwork has colour reduction, five recolour methods, presets, Limit to Library, a colour-wheel Edit tab and Edit Color Group; a local Color Themes panel saves five-colour themes. Fill/Stroke chips open swatch and mixer popovers (the Properties panel has the Control bar's Fill and Stroke chips, Stroke link and weight spinner, with nothing selected too), panels have Illustrator's Window menu keys (Align Shift+F7, Transform Shift+F8, Pathfinder Cmd+Shift+F9, Layers F7, Character Cmd+T…; every panel can be given one in Edit › Keyboard Shortcuts), and Eyedropper Options pick up and apply chosen attributes (Alt and Shift+Alt, image pixels). An ICC CMYK profile converts straight into the RGB working space (not through sRGB, so a wider space such as Wide Gamut RGB keeps colours sRGB can't hold) with the colour settings' black-point compensation, on the canvas and in RGB exports alike. Fills and strokes can overprint (Attributes panel, Overprint Black options), and CMYK documents blend in inks on screen, in PDF and when flattening. Document Color Mode converts the art, symbols, pattern tiles and swatches through the colour settings: Gray stays Gray, RGB greys separate into four-colour greys and a rich black as Illustrator does, or go on the black plate only with `grays: "black"` (also for `document.open {colorMode}`).
+  - **Stroke visibility (#1253):** adding paint to a previously unpainted zero-width stroke restores the existing 1 pt default (`PaintDefaults::default`, `Appearance::set_stroke`), for the selected appearance item, the new-art defaults and Swap Fill/Stroke. Positive widths are kept; recoloring a painted zero-width stroke keeps its explicit zero. A real Eyedropper-to-new-shape sequence reproduces the zero-width inheritance. Five engine regressions cover creation, defaults, targeted items, preserved widths and one-step Undo/Redo (`crates/engine/tests/stroke_visibility.rs`).
   - **Gradients:** lossless, validated gradient params; gradients follow rotate, reflect, shear, non-uniform scale and distortions; the Gradient tool edits the fill or stroke of the active proxy, type included; an interactive on-canvas annotator (move, length/angle, rotate, add/move/delete/duplicate stops, midpoints, a stop popover, Delete and arrow keys). The Gradient panel has the Fill/Stroke proxy, a gradient-swatch dropdown with Save to Swatches, midpoint locations, Alt-drag to copy or swap stops, swatch drops on the ramp and a stop eyedropper; copied appearances and graphic styles place gradients on each target's own bounds; gradient handles snap and honour Constrain Angle. Gradient stops stay linked to global and spot swatches. Freeform gradients (points and lines) are edited on the canvas; radial gradients have an extent ellipse, an aspect handle and an off-centre focal point (SVG `fx`/`fy`, PDF two-point radials). A stroke's gradient runs within, along or across it. Object ▸ Expand turns gradients into N objects or a gradient mesh.
   - **Strokes:** one stroke-geometry module shared by the canvas, SVG, PDF and Outline Stroke; dotted lines (zero-length dashes draw dots or squares); arrowheads with hollow outlines, tip-on-end or extend-past-end alignment and one opacity for line and head. SVG and PDF export arrowheads, width profiles, brushes and aligned strokes exactly as the canvas draws them; Outline Stroke and the live Outline Stroke effect outline every stroke item as drawn (dashes, heads, profiles, alignment); dashes can be fitted to corners and path ends; width profiles carry through dashes, and their corners take the join. The Stroke panel edits type's character strokes, follows the stroke units (its weight presets are round values in that unit: `0.25 mm`, `0.0625 in`, `1 px`, #426; fields show four decimals in mm, cm and inches, three in points), shows mixed values blank and opens from the Control bar. A width profile library, thirty more arrowheads, and Width Point Edit with multi-select and discontinuous points. Visual bounds and clicks cover the whole painted stroke. Scale Strokes & Effects, Scale Corners and Use Preview Bounds work everywhere, and new art inherits stroke options, a graphic style or the whole last appearance.
   - **Brushes (part of #852):** double-clicking a brush in the Brushes panel (or the panel menu's Brush Options…) opens Calligraphic Brush Options (Name; Angle, Roundness and Size, each Fixed, Random or Pressure with its Variation; live previews of the nib and of a light–heavy–light stroke) or Bristle Brush Options (Shape and the bristle sliders); OK edits the brush and every stroke painted with it. The Paintbrush records the pen pressure along each stroke (kept with the path, saved, and joined when a stroke continues a path); a Calligraphic value on Pressure goes from value − variation at the lightest pressure to value + variation at the heaviest, on the canvas and in SVG, PDF and the other exports. Brushes saved before keep their look. Scatter Brush Options (Size, Spacing, Scatter and Rotation, each Fixed, Random between two values or Pressure from the first at the lightest pressure to the second at the heaviest; Rotation relative to Page or Path), Art Brush Options (Width, Scale Proportionately, Stretch to Fit Stroke Length or Stretch Between Guides with the guides' start and end, the four Directions, Flip Along and Across) and Pattern Brush Options (Scale, Spacing, the five tiles shown, Flip Along and Across, Stretch to fit, Add space to fit or Approximate path) each have Colorization (None, Tints, Tints and Shades, Hue Shift with its Key Color picked from the art's colours) and a live stroke preview; values from files and commands are clamped to their ranges. Still to come: the Art brush's Overlap, auto-generated Pattern brush corners, new tile art picked in Pattern Brush Options, Stylus Wheel, Tilt, Bearing and Rotation, and pen pressure on macOS.
@@ -467,6 +468,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | Colour: unpainted zero-width strokes regain 1 pt when painted (#1253); scores and hours unchanged |
 | 2026-10-11 | minor | The Graph Data worksheet (Import Data, Cell Style, Transpose, Switch x/y, Revert). Scores unchanged within rounding |
 | 2026-10-11 | minor | Graph label formatting kept through regeneration. Scores unchanged within rounding |
 | 2026-10-11 | minor | Graph Type's widths past 100%, First Row/Column in Front and Draw Filled Lines. Scores unchanged within rounding |

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (macOS save sheets offer a Format menu, #866; Attributes fill-rule controls edit the compound when a member is selected, #1197; a marquee needs to touch a path, not just lie inside its fill, #1103; earlier: Live Corners round corners between curved sides, #1144) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (Adding paint to an unpainted zero-width stroke restores the 1 pt default (#1253); scores unchanged; macOS save sheets offer a Format menu, #866; Attributes fill-rule controls edit the compound when a member is selected, #1197; a marquee needs to touch a path, not just lie inside its fill, #1103; earlier: Live Corners round corners between curved sides, #1144) · **Target:** Adobe Illustrator 2026 (30.x)
 
 How VectorCraft's tools, handles, snapping and panels behave next to Illustrator's. A vector illustrator's
 trust is in the details: where a handle lands, what Shift and Alt do mid-drag, what a smart guide snaps to,
@@ -126,6 +126,7 @@ tools, never checked side by side) isn't captured row by row.
 |---|---|---|
 | Space: Hand; Cmd+Space / Cmd+Alt+Space: zoom in/out; middle button pans | done | |
 | Cmd/Ctrl: last-used selection tool; Cmd+Alt: Group Selection inside Direct Selection | partial | |
+| Add a visible stroke after drawing with inherited None/zero-width paint | done | Paint and Swap Fill/Stroke restore the existing 1 pt default; positive widths and painted zero widths stay as set; Undo/Redo and targeted appearance items tested (`stroke_visibility.rs`, #1253) |
 | Alt-drag duplicates (objects, artboards with their art) | done | |
 | Shift-click selects several artboards (Artboard tool, Artboards panel); they move, Alt-copy and delete together | done | `artboard.move`/`artboard.delete` `indices` (#1139) |
 | Shape tools: Shift constrains, Alt from centre, Space moves while dragging, arrows change sides/points/rows | done | |
@@ -172,6 +173,7 @@ re-measure of the panels added since.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | Adding paint to an unpainted zero-width stroke restores the 1 pt default (#1253); scores unchanged |
 | 2026-10-12 | minor | macOS native save sheets gain a localised Format menu (#866); filename regression tests and an actual SVG save, PDF selection and cancellation verified; scores unchanged (estimated) |
 | 2026-10-12 | minor | Attributes: directly selected compound members read and change the compound fill rule; path direction stays member-local (#1197); score unchanged |
 | 2026-10-11 | minor | A marquee inside a filled shape no longer selects it: only touching its path does (#1103); score unchanged (estimated) |