Toolbar drop-downs highlight the row under the pointer and the keyboard focus (#288)

A panel drop-down's command rows are full-width rows that take the theme's hover background
(icon, label and shortcut on it) when hovered or focused. Up/Down move the focus through the
enabled rows, Enter starts the command, Escape closes the drop-down. Rows publish
`dropdown:<id>` and the highlighted one `dropdown_hot:<id>`; scenario s46 checks pointer and
keyboard highlight.

Fixes #288

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

AGENTS.md

@@ -2,10 +2,9 @@
 
 SolidCraft is a clean-room, open-source, pure-Rust parametric 3D CAD application:
 sketches with a constraint solver, a parametric timeline of features, a B-rep
-kernel, and a desktop UI that agents can drive. Siblings with the same conventions live next to
-it in `storytold/`: `cadcraft` (AutoCAD-style, the closest relative), `photocraft`, `vectorcraft`,
-`gridcraft`, `designcraft`, `wordcraft`, `deckcraft`, `soundcraft`. Repos don't share code; when
-code is adapted from a sibling (MIT OR Apache-2.0) it is noted in ATTRIBUTION.md.
+kernel, and a desktop UI that agents can drive. Projects published by
+[storytold](https://github.com/storytold) can serve as references for implementation conventions.
+Any code adapted from other projects (MIT OR Apache-2.0) is noted in ATTRIBUTION.md.
 
 ## Product name and compatibility
 SolidCraft is the displayed product name; `solidcraft` is the repository name. Keep existing

ATTRIBUTION.md

@@ -55,7 +55,7 @@ Generated-in-code assets are original and have no file to list:
 |---|---|---|---|
 | vendor/truck-meshalgo | truck-meshalgo 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | meshing: parameter searches kept inside the surface domain (vendor/README.md) |
 | vendor/truck-stepio | truck-stepio 0.3.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | STEP writer: intersection-curve surfaces written at unique ids (vendor/README.md) |
-| vendor/truck-shapeops | truck-shapeops 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | robust meshing and nearest-parameter fallback in booleans; trace macro (vendor/README.md) |
+| vendor/truck-shapeops | truck-shapeops 0.4.0, https://github.com/ricosjp/truck (RICOS Co. Ltd.) | Apache-2.0 | robust meshing and nearest-parameter fallback in booleans; degenerate intersection-curve rejection; trace macro (vendor/README.md) |
 | vendor/matext4cgmath | matext4cgmath 0.1.0, https://github.com/ricosjp/matext4cgmath (RICOS Co. Ltd.) | Apache-2.0 | root refinement stops after 100 Newton steps (vendor/README.md) |
 
 ## Vendored renderer compatibility fix

CLAUDE.md

@@ -2,10 +2,9 @@
 
 SolidCraft is a clean-room, open-source, pure-Rust parametric 3D CAD application:
 sketches with a constraint solver, a parametric timeline of features, a B-rep
-kernel, and a desktop UI that agents can drive. Siblings with the same conventions live next to
-it in `storytold/`: `cadcraft` (AutoCAD-style, the closest relative), `photocraft`, `vectorcraft`,
-`gridcraft`, `designcraft`, `wordcraft`, `deckcraft`, `soundcraft`. Repos don't share code; when
-code is adapted from a sibling (MIT OR Apache-2.0) it is noted in ATTRIBUTION.md.
+kernel, and a desktop UI that agents can drive. Projects published by
+[storytold](https://github.com/storytold) can serve as references for implementation conventions.
+Any code adapted from other projects (MIT OR Apache-2.0) is noted in ATTRIBUTION.md.
 
 ## Product name and compatibility
 SolidCraft is the displayed product name; `solidcraft` is the repository name. Keep existing

Cargo.lock

@@ -3297,6 +3297,7 @@ dependencies = [
  "embed-resource",
  "hidapi",
  "log",
+ "quick-xml 0.38.4",
  "rfd",
  "serde_json",
  "solvecraft-engine",

README.md

@@ -4,7 +4,7 @@
 
 Sketch, constrain, and build solids with a parametric feature timeline. Change a dimension
 and watch your model rebuild. Run it on your desktop, in your browser, or let AI agents
-model through the built-in MCP server. Part of the storytold "craft" family.
+model through the built-in MCP server.
 
 ![SolidCraft: draw a rounded electronics enclosure, sketch its USB port directly on a face, add four mounting bosses and resize it through Parameters](docs/screenshots/enclosure-demo-0.2.1.gif)
 

ROADMAP.md

@@ -67,6 +67,9 @@ headline counts in-scope tabs only and lists the deferred ones separately.
   Type a value and press Enter to commit one undo step; rejected values remain editable and
   cancellation leaves the sketch unchanged. Fit keeps geometry clear of the Sketch Palette
   and navigation controls, including enlarged displays and nested pending placements.
+- Curvature and Polygon constraints accept complete preselected operands. Fix/Unfix
+  consumes complete point/curve selections consistently; mixed or ambiguous selections
+  retain the picking workflow. Rejected constraints preserve selection and undo history.
 - Contextual error reporting: a **Create Issue** action beside feature errors opens a
   reviewable GitHub issue draft with the error, operation settings, build diagnostics and
   useful reproduction context. The draft is editable, with optional capture of the actual
@@ -304,6 +307,9 @@ headline counts in-scope tabs only and lists the deferred ones separately.
 
 ## Kernel
 
+- Boolean intersection-curve construction refuses point-only, collapsed and non-finite
+  polylines without panicking. Direct constructor regressions retain valid open endpoints
+  and closed spherical intersections; the original interactive trigger remains unidentified.
 - Shell of a stepped, joined planar body no longer creates horizontal subdivisions across
   continuous walls. Fresh axis-aligned Cut walls are stitched using their exact construction
   support and shared topology, preserving real steps and intentional boundaries. The local

apps/solvecraft/Cargo.toml

@@ -21,6 +21,7 @@ rfd = { workspace = true }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 hidapi = { version = "2.6.7", default-features = false, features = ["windows-native"] }
+quick-xml = { workspace = true }
 
 [target.'cfg(all(unix, not(target_os = "macos")))'.dependencies]
 winit = { version = "0.30", default-features = false, features = ["x11"] }

apps/solvecraft/src/space_mouse.rs

@@ -6,11 +6,14 @@ use std::time::{Duration, Instant};
 
 use egui::Context;
 use hidapi::{DeviceInfo, HidApi};
+use quick_xml::Reader;
+use quick_xml::events::Event;
 use solvecraft_engine::render::Camera;
 use solvecraft_ui_egui::SolveApp;
 
 const STALE_AFTER: Duration = Duration::from_millis(150);
 const RETRY_AFTER: Duration = Duration::from_secs(2);
+const MAX_PROFILE_BYTES: u64 = 1024 * 1024;
 
 #[derive(Clone, Copy, Debug, Default, PartialEq)]
 struct Axes {
@@ -18,6 +21,172 @@ struct Axes {
     rotation: [i16; 3],
 }
 
+#[derive(Clone, Copy, Debug, PartialEq)]
+struct AxisRule {
+    output: usize,
+    enabled: bool,
+    reversed: bool,
+    scale: f64,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+struct DriverMapping {
+    axes: [AxisRule; 6],
+    overall_scale: f64,
+}
+
+impl Default for DriverMapping {
+    fn default() -> Self {
+        Self { axes: std::array::from_fn(|output| AxisRule { output, enabled: true, reversed: false, scale: 1.0 }), overall_scale: 1.0 }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+struct Motion {
+    translation: [f64; 3],
+    rotation: [f64; 3],
+}
+
+impl DriverMapping {
+    fn apply(self, axes: Axes) -> Motion {
+        let raw = [
+            normalized(axes.translation[0]),
+            normalized(axes.translation[1]),
+            normalized(axes.translation[2]),
+            normalized(axes.rotation[0]),
+            normalized(axes.rotation[1]),
+            normalized(axes.rotation[2]),
+        ];
+        let mut logical = [0.0; 6];
+        for (input, rule) in self.axes.iter().enumerate() {
+            if rule.enabled {
+                let sign = if rule.reversed { -1.0 } else { 1.0 };
+                logical[rule.output] = raw[input] * sign * rule.scale * self.overall_scale;
+            }
+        }
+        Motion { translation: [logical[0], logical[1], logical[2]], rotation: [logical[3], logical[4], logical[5]] }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Default)]
+struct ProfileAxis {
+    input: Option<usize>,
+    output: Option<usize>,
+    enabled: bool,
+    reversed: bool,
+    scale: f64,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum ProfilePart {
+    Input,
+    Output,
+}
+
+fn axis_index(name: &str) -> Option<usize> {
+    match name.trim() {
+        "HIDMultiAxis_X" => Some(0),
+        "HIDMultiAxis_Y" => Some(1),
+        "HIDMultiAxis_Z" => Some(2),
+        "HIDMultiAxis_Rx" => Some(3),
+        "HIDMultiAxis_Ry" => Some(4),
+        "HIDMultiAxis_Rz" => Some(5),
+        _ => None,
+    }
+}
+
+/// 3DxWare stores the active KMJ application's axis selection, swapping, inversion and speed in
+/// `%APPDATA%/3Dconnexion/3DxWare/Cfg/<app>-KMJ.xml`. Direct HID reads bypass the driver, so apply
+/// that profile explicitly when it exists. Unknown or incomplete fields retain the raw HID axis.
+fn parse_driver_mapping(xml: &[u8]) -> Option<DriverMapping> {
+    let mut reader = Reader::from_reader(xml);
+    reader.config_mut().trim_text(true);
+    let mut buf = Vec::new();
+    let mut mapping = DriverMapping::default();
+    let mut axis: Option<ProfileAxis> = None;
+    let mut part = None;
+    let mut field = Vec::new();
+    let mut found = false;
+    loop {
+        match reader.read_event_into(&mut buf).ok()? {
+            Event::Start(start) => match start.local_name().as_ref() {
+                b"Axis" => axis = Some(ProfileAxis { enabled: true, scale: 1.0, ..Default::default() }),
+                b"Input" => part = Some(ProfilePart::Input),
+                b"Output" => part = Some(ProfilePart::Output),
+                name @ (b"ActionID" | b"Enabled" | b"Reversed" | b"Scale" | b"OverallScale") => field = name.to_vec(),
+                _ => {}
+            },
+            Event::Text(text) => {
+                let value = String::from_utf8_lossy(text.as_ref());
+                match field.as_slice() {
+                    b"ActionID" => {
+                        if let Some(current) = axis.as_mut() {
+                            match part {
+                                Some(ProfilePart::Input) => current.input = axis_index(&value),
+                                Some(ProfilePart::Output) => current.output = axis_index(&value),
+                                None => {}
+                            }
+                        }
+                    }
+                    b"Enabled" => {
+                        if let Some(current) = axis.as_mut() {
+                            current.enabled = value.trim().eq_ignore_ascii_case("true");
+                        }
+                    }
+                    b"Reversed" => {
+                        if part == Some(ProfilePart::Output)
+                            && let Some(current) = axis.as_mut()
+                        {
+                            current.reversed = value.trim().eq_ignore_ascii_case("true");
+                        }
+                    }
+                    b"Scale" => {
+                        if part == Some(ProfilePart::Output)
+                            && let Some(scale) = value.trim().parse::<f64>().ok().filter(|scale| scale.is_finite())
+                            && let Some(current) = axis.as_mut()
+                        {
+                            current.scale = scale.clamp(0.0, 10.0);
+                        }
+                    }
+                    b"OverallScale" => {
+                        if let Some(scale) = value.trim().parse::<f64>().ok().filter(|scale| scale.is_finite()) {
+                            mapping.overall_scale = scale.clamp(0.0, 10.0);
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            Event::End(end) => match end.local_name().as_ref() {
+                b"Axis" => {
+                    if let Some(current) = axis.take()
+                        && let (Some(input), Some(output)) = (current.input, current.output)
+                    {
+                        mapping.axes[input] = AxisRule { output, enabled: current.enabled, reversed: current.reversed, scale: current.scale };
+                        found = true;
+                    }
+                }
+                b"Input" | b"Output" => part = None,
+                b"ActionID" | b"Enabled" | b"Reversed" | b"Scale" | b"OverallScale" => field.clear(),
+                _ => {}
+            },
+            Event::Eof => break,
+            _ => {}
+        }
+        buf.clear();
+    }
+    found.then_some(mapping)
+}
+
+fn load_driver_mapping() -> Option<DriverMapping> {
+    let profile = std::path::PathBuf::from(std::env::var_os("APPDATA")?).join("3Dconnexion").join("3DxWare").join("Cfg").join("solvecraft-KMJ.xml");
+    if std::fs::metadata(&profile).ok()?.len() > MAX_PROFILE_BYTES {
+        log::warn!("3D mouse: ignoring oversized 3DxWare profile {}", profile.display());
+        return None;
+    }
+    let xml = std::fs::read(&profile).ok()?;
+    parse_driver_mapping(&xml)
+}
+
 #[derive(Clone, Copy)]
 struct Reading {
     axes: Axes,
@@ -107,6 +276,8 @@ fn reader(ctx: Context, shared: Arc<Mutex<Reading>>) {
 pub struct SpaceMouse {
     shared: Arc<Mutex<Reading>>,
     last_frame: Instant,
+    driver_mapping: DriverMapping,
+    mapping_checked_at: Instant,
 }
 
 impl SpaceMouse {
@@ -118,13 +289,21 @@ impl SpaceMouse {
         if let Err(error) = std::thread::Builder::new().name("solvecraft-3d-mouse".into()).spawn(move || reader(worker_ctx, worker_state)) {
             log::warn!("3D mouse: reader could not start: {error}");
         }
-        Self { shared, last_frame: now }
+        Self { shared, last_frame: now, driver_mapping: load_driver_mapping().unwrap_or_default(), mapping_checked_at: now }
     }
 
     pub fn tick(&mut self, app: &mut SolveApp, ctx: &Context) {
         let now = Instant::now();
         let seconds = now.duration_since(self.last_frame).as_secs_f64().min(0.05);
         self.last_frame = now;
+        if now.duration_since(self.mapping_checked_at) >= RETRY_AFTER {
+            let updated = load_driver_mapping().unwrap_or_default();
+            if updated != self.driver_mapping {
+                log::info!("3D mouse: applying updated 3DxWare axis profile");
+                self.driver_mapping = updated;
+            }
+            self.mapping_checked_at = now;
+        }
         if !app.preferences.space_mouse_enabled || app.home.open {
             return;
         }
@@ -141,7 +320,14 @@ impl SpaceMouse {
         }
         app.begin_external_navigation();
         let height = app.viewport.rect.map_or(600.0, |rect| f64::from(rect.height().max(1.0)));
-        navigate(&mut app.cam, axes, seconds * speed.clamp(0.1, 5.0), height, app.session.active_sketch.is_some());
+        navigate(
+            &mut app.cam,
+            self.driver_mapping.apply(axes),
+            seconds * speed.clamp(0.1, 5.0),
+            height,
+            app.session.active_sketch.is_some(),
+            app.preferences.zoom_reverse,
+        );
         ctx.request_repaint_after(Duration::from_millis(16));
     }
 }
@@ -153,15 +339,21 @@ fn normalized(value: i16) -> f64 {
     if v.abs() <= 20.0 { 0.0 } else { v.signum() * ((v.abs() - 20.0) / 330.0).min(1.0) }
 }
 
-fn navigate(cam: &mut Camera, axes: Axes, seconds: f64, height: f64, sketch: bool) {
+fn navigate(cam: &mut Camera, motion: Motion, seconds: f64, height: f64, sketch: bool, reverse_zoom: bool) {
     if !(seconds > 0.0) || !seconds.is_finite() {
         return;
     }
-    let [x, y, z] = axes.translation.map(normalized);
-    let [rx, ry, rz] = axes.rotation.map(normalized);
-    cam.pan(x * height * 0.6 * seconds, -y * height * 0.6 * seconds, height);
-    cam.zoom_at((-z * 1.5 * seconds).exp(), None);
+    let [x, y, z] = motion.translation;
+    let [rx, ry, rz] = motion.rotation;
+    // Logical 3DxWare coordinates are X = left/right, Y = zoom and Z = up/down. The user's
+    // profile above can swap the physical forward/back and up/down axes before they reach here.
+    cam.pan(x * height * 0.6 * seconds, z * height * 0.6 * seconds, height);
+    let zoom_sign = if reverse_zoom { -1.0 } else { 1.0 };
+    cam.zoom_at((-y * zoom_sign * 1.5 * seconds).exp(), None);
     if !sketch {
+        // These are logical 3DxWare coordinates after the profile mapping above: Rx is Tilt,
+        // Ry is Roll and Rz is Spin. The KMJ profile swaps physical Ry/Rz for the selected
+        // navigation mode, so swapping them again here would make Roll behave like Spin.
         cam.orbit(ry * 250.0 * seconds, rx * 250.0 * seconds);
         cam.roll_by(rz * 2.0 * seconds);
     }
@@ -171,6 +363,10 @@ fn navigate(cam: &mut Camera, axes: Axes, seconds: f64, height: f64, sketch: boo
 mod tests {
     use super::*;
 
+    fn raw(axes: Axes) -> Motion {
+        DriverMapping::default().apply(axes)
+    }
+
     #[test]
     fn decodes_separate_reports_without_stale_motion_or_padding_interference() {
         let now = Instant::now();
@@ -192,15 +388,102 @@ mod tests {
     fn six_axes_move_the_camera_and_sketches_keep_their_orientation() {
         let mut cam = Camera::default();
         let before = cam;
-        navigate(&mut cam, Axes { translation: [350, 350, 350], rotation: [350, 350, 350] }, 0.02, 600.0, false);
+        navigate(&mut cam, raw(Axes { translation: [350, 350, 350], rotation: [350, 350, 350] }), 0.02, 600.0, false, false);
         assert_ne!(cam.target, before.target);
         assert!(cam.distance < before.distance);
         assert_ne!(cam.yaw, before.yaw);
         assert_ne!(cam.pitch, before.pitch);
         assert_ne!(cam.roll, before.roll);
         let orientation = (cam.yaw, cam.pitch, cam.roll);
-        navigate(&mut cam, Axes { translation: [350, 0, 0], rotation: [350, 350, 350] }, 0.02, 600.0, true);
+        navigate(&mut cam, raw(Axes { translation: [350, 0, 0], rotation: [350, 350, 350] }), 0.02, 600.0, true, false);
         assert_eq!((cam.yaw, cam.pitch, cam.roll), orientation);
         assert!(cam.is_valid());
     }
+
+    #[test]
+    fn individual_axes_have_physical_spacemouse_meaning() {
+        let before = Camera::default();
+
+        let mut slide = before;
+        navigate(&mut slide, raw(Axes { translation: [350, 0, 0], rotation: [0; 3] }), 0.02, 600.0, false, false);
+        assert_ne!(slide.target, before.target);
+        assert_eq!(slide.distance, before.distance);
+
+        let mut push = before;
+        navigate(&mut push, raw(Axes { translation: [0, 350, 0], rotation: [0; 3] }), 0.02, 600.0, false, false);
+        assert_eq!(push.target, before.target);
+        assert!(push.distance < before.distance);
+
+        let mut lift = before;
+        navigate(&mut lift, raw(Axes { translation: [0, 0, 350], rotation: [0; 3] }), 0.02, 600.0, false, false);
+        assert_ne!(lift.target, before.target);
+        assert_eq!(lift.distance, before.distance);
+
+        let mut tilt = before;
+        navigate(&mut tilt, raw(Axes { translation: [0; 3], rotation: [350, 0, 0] }), 0.02, 600.0, false, false);
+        assert_eq!((tilt.yaw, tilt.roll), (before.yaw, before.roll));
+        assert_ne!(tilt.pitch, before.pitch);
+
+        let mut roll = before;
+        navigate(&mut roll, raw(Axes { translation: [0; 3], rotation: [0, 350, 0] }), 0.02, 600.0, false, false);
+        assert_eq!((roll.pitch, roll.roll), (before.pitch, before.roll));
+        assert_ne!(roll.yaw, before.yaw);
+
+        let mut twist = before;
+        navigate(&mut twist, raw(Axes { translation: [0; 3], rotation: [0, 0, 350] }), 0.02, 600.0, false, false);
+        assert_eq!((twist.yaw, twist.pitch), (before.yaw, before.pitch));
+        assert_ne!(twist.roll, before.roll);
+    }
+
+    #[test]
+    fn reverse_zoom_setting_applies_to_spacemouse() {
+        let before = Camera::default();
+        let motion = raw(Axes { translation: [0, 350, 0], rotation: [0; 3] });
+        let mut normal = before;
+        navigate(&mut normal, motion, 0.02, 600.0, false, false);
+        let mut reversed = before;
+        navigate(&mut reversed, motion, 0.02, 600.0, false, true);
+        assert!(normal.distance < before.distance);
+        assert!(reversed.distance > before.distance);
+    }
+
+    #[test]
+    fn applies_3dxware_axis_swaps_and_reversals() {
+        let profile = br#"
+            <AppCfg><Devices><Device><AxisBank>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_X</ActionID></Input><Output><ActionID>HIDMultiAxis_X</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Y</ActionID></Input><Output><ActionID>HIDMultiAxis_Z</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Z</ActionID></Input><Output><ActionID>HIDMultiAxis_Y</ActionID><Reversed>true</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Rx</ActionID></Input><Output><ActionID>HIDMultiAxis_Rx</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Ry</ActionID></Input><Output><ActionID>HIDMultiAxis_Rz</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Rz</ActionID></Input><Output><ActionID>HIDMultiAxis_Ry</ActionID><Reversed>true</Reversed></Output></Axis>
+            </AxisBank></Device></Devices></AppCfg>
+        "#;
+        let mapping = parse_driver_mapping(profile).expect("valid 3DxWare profile");
+        let motion = mapping.apply(Axes { translation: [350, 0, 350], rotation: [350, 0, 350] });
+        assert_eq!(motion.translation, [1.0, -1.0, 0.0]);
+        assert_eq!(motion.rotation, [1.0, -1.0, 0.0]);
+    }
+
+    #[test]
+    fn mapped_roll_and_spin_reach_distinct_camera_rotations() {
+        let profile = br#"
+            <AppCfg><Devices><Device><AxisBank>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Ry</ActionID></Input><Output><ActionID>HIDMultiAxis_Rz</ActionID><Reversed>false</Reversed></Output></Axis>
+              <Axis><Enabled>true</Enabled><Input><ActionID>HIDMultiAxis_Rz</ActionID></Input><Output><ActionID>HIDMultiAxis_Ry</ActionID><Reversed>true</Reversed></Output></Axis>
+            </AxisBank></Device></Devices></AppCfg>
+        "#;
+        let mapping = parse_driver_mapping(profile).expect("valid 3DxWare profile");
+        let before = Camera::default();
+
+        let mut physical_roll = before;
+        navigate(&mut physical_roll, mapping.apply(Axes { translation: [0; 3], rotation: [0, 350, 0] }), 0.02, 600.0, false, false);
+        assert_eq!((physical_roll.yaw, physical_roll.pitch), (before.yaw, before.pitch));
+        assert_ne!(physical_roll.roll, before.roll);
+
+        let mut physical_spin = before;
+        navigate(&mut physical_spin, mapping.apply(Axes { translation: [0; 3], rotation: [0, 0, 350] }), 0.02, 600.0, false, false);
+        assert_ne!(physical_spin.yaw, before.yaw);
+        assert_eq!((physical_spin.pitch, physical_spin.roll), (before.pitch, before.roll));
+    }
 }

crates/kernel/src/intersection_curve_tests.rs

@@ -0,0 +1,60 @@
+//! Regressions against the actual patched truck constructor, run by workspace CI.
+use truck_meshalgo::prelude::PolylineCurve;
+use truck_modeling::{BoundedCurve, ParametricCurve, Plane, Point3, Sphere};
+use truck_shapeops::IntersectionCurveWithParameters;
+
+fn planes() -> (Plane, Plane) {
+    let o = Point3::new(0.0, 0.0, 0.0);
+    (Plane::new(o, Point3::new(1.0, 0.0, 0.0), Point3::new(0.0, 1.0, 0.0)), Plane::new(o, Point3::new(1.0, 0.0, 0.0), Point3::new(0.0, 0.0, 1.0)))
+}
+
+#[test]
+fn degenerate_intersection_polylines_return_none_without_panicking() {
+    let origin = Point3::new(0.0, 0.0, 0.0);
+    for points in [
+        vec![],
+        vec![origin],
+        vec![origin, origin],
+        vec![origin; 3],
+        vec![origin, Point3::new(f64::NAN, 0.0, 0.0)],
+        vec![origin, Point3::new(f64::INFINITY, 0.0, 0.0)],
+    ] {
+        let (a, b) = planes();
+        let result = std::panic::catch_unwind(|| IntersectionCurveWithParameters::try_new(a, b, PolylineCurve(points.clone()), 0.01));
+        assert!(result.is_ok(), "constructor panicked for {points:?}");
+        assert!(result.unwrap().is_none(), "collapsed input must not create a curve: {points:?}");
+    }
+}
+
+#[test]
+fn closed_intersection_retains_the_closure_and_spherical_supports() {
+    let a = Sphere::new(Point3::new(0.0, 0.0, 1.0), 2.0_f64.sqrt());
+    let b = Sphere::new(Point3::new(0.0, 0.0, -1.0), 2.0_f64.sqrt());
+    let poly = PolylineCurve(vec![
+        Point3::new(1.0, 0.0, 0.0),
+        Point3::new(0.0, 1.0, 0.0),
+        Point3::new(-1.0, 0.0, 0.0),
+        Point3::new(0.0, -1.0, 0.0),
+        Point3::new(1.0, 0.0, 0.0),
+    ]);
+    let curve = IntersectionCurveWithParameters::try_new(a, b, poly, 0.01).unwrap();
+    let (lo, hi) = curve.range_tuple();
+    assert_eq!(curve.subs(lo), curve.subs(hi));
+    for i in 0..=40 {
+        let p = curve.subs(lo + (hi - lo) * i as f64 / 40.0);
+        assert!(p.z.abs() < 1e-8, "{p:?}");
+        assert!(((p.x * p.x + p.y * p.y).sqrt() - 1.0).abs() <= 0.01, "{p:?}");
+    }
+}
+
+#[test]
+fn open_intersection_keeps_endpoints_on_both_planes() {
+    let (a, b) = planes();
+    let start = Point3::new(1.0, 0.0, 0.0);
+    let end = Point3::new(3.0, 0.0, 0.0);
+    let curve = IntersectionCurveWithParameters::try_new(a, b, PolylineCurve(vec![start, end]), 0.01).unwrap();
+    let (lo, hi) = curve.range_tuple();
+    assert_eq!(curve.subs(lo), start);
+    assert_eq!(curve.subs(hi), end);
+    assert_eq!(curve.subs((lo + hi) / 2.0), Point3::new(2.0, 0.0, 0.0));
+}

crates/kernel/src/lib.rs

@@ -30,6 +30,8 @@ mod heal;
 mod helix;
 mod iges_in;
 mod iges_out;
+#[cfg(test)]
+mod intersection_curve_tests;
 mod lip;
 mod loopblend;
 mod measure;

crates/ui-egui/src/i18n.rs

@@ -33,7 +33,8 @@ impl Catalog {
 
 static ENGLISH: Catalog = Catalog::new("en", "English", include_str!("locales/en.json"));
 static JAPANESE: Catalog = Catalog::new("ja", "日本語", include_str!("locales/ja.json"));
-pub const LOCALES: &[&Catalog] = &[&ENGLISH, &JAPANESE];
+static GERMAN: Catalog = Catalog::new("de", "Deutsch", include_str!("locales/de.json"));
+pub const LOCALES: &[&Catalog] = &[&ENGLISH, &JAPANESE, &GERMAN];
 
 pub fn is_supported(id: &str) -> bool {
     LOCALES.iter().any(|catalog| catalog.id == id)

crates/ui-egui/src/lib.rs

@@ -519,22 +519,6 @@ impl SolveApp {
             let edges = self.session.selection.iter().any(|s| matches!(s, solvecraft_engine::Sel::Edge { .. }));
             return self.start(if edges { "solid.fillet" } else { "solid.extrude" });
         }
-        // Fix/Unfix: the selected sketch points and curves change at once, otherwise pick them.
-        if id == "sketch.constraint.fix" {
-            let ents: Vec<String> = self
-                .session
-                .selection
-                .iter()
-                .filter_map(|s| match s {
-                    solvecraft_engine::Sel::SketchCurve { id } | solvecraft_engine::Sel::SketchPoint { id } => Some(id.clone()),
-                    _ => None,
-                })
-                .collect();
-            if !ents.is_empty() {
-                let _ = self.run(id, json!({ "entities": ents }));
-                return;
-            }
-        }
         // Construction toggle: selected sketch curves switch at once, otherwise pick them.
         // Construction (X): convert the selection, or switch construction mode; no pick tool.
         if id == "sketch.construction" {

crates/ui-egui/src/locales/de.json

@@ -0,0 +1,296 @@
+{
+  "browser.body_name": "Körper {number}",
+  "browser.component_name": "Komponente {number}",
+  "browser.parameters": "Parameter ({count})",
+  "browser.precision": "Genauigkeit: {precision}",
+  "browser.sketch_name": "Skizze {number}",
+  "browser.units": "Einheiten: {units}",
+  "dialog.custom_axis": "↖ Eigene Achse",
+  "dialog.edit_title": "{title} bearbeiten",
+  "dialog.select": "↖ Auswählen",
+  "dialog.selected_count": "↖ {count} ausgewählt",
+  "document.save_changes": "Änderungen in {name} speichern?",
+  "document.unsaved_changes": "{name} enthält ungespeicherte Änderungen. Wenn Sie nicht speichern, gehen sie verloren.",
+  "sketch.degrees_of_freedom": "{count} Freiheitsgrade",
+  "sketch.draw_curves": "{linetype}-Kurven zeichnen",
+  "sketch.make_selection": "Auswahl als {linetype} markieren",
+  "ui.1_degree_of_freedom": "1 Freiheitsgrad",
+  "ui.3d_sketch": "3D-Skizze",
+  "ui.about": "Über",
+  "ui.activate": "Aktivieren",
+  "ui.active_component": "Aktive Komponente",
+  "ui.agent_cursor": "Agent-Cursor",
+  "ui.agent_cursor_speed": "Agent-Cursor-Geschwindigkeit",
+  "ui.all": "Alle",
+  "ui.angle": "Winkel",
+  "ui.angle_decimals": "Winkel-Dezimalstellen",
+  "ui.animate_view_changes": "Ansichtsänderungen animieren",
+  "ui.animation": "Animation",
+  "ui.animation_speed": "Animationsgeschwindigkeit",
+  "ui.apply": "Anwenden",
+  "ui.arc": "Kreisbogen",
+  "ui.assemble": "Zusammenbau",
+  "ui.autosave_every": "Autospeichern alle",
+  "ui.axes": "Achsen",
+  "ui.axis": "Achse",
+  "ui.bodies": "Körper",
+  "ui.box": "Block",
+  "ui.break": "Unterbrechen",
+  "ui.cancel": "Abbrechen",
+  "ui.canvases": "Kanvas",
+  "ui.centerline": "Mittellinie",
+  "ui.chamfer": "Abschrägung",
+  "ui.change_workspace": "Arbeitsbereich wechseln",
+  "ui.chord_length": "Sehnenlänge",
+  "ui.circle": "Kreis",
+  "ui.circular_pattern": "Radiales Muster",
+  "ui.clear_recent": "Zuletzt verwendet leeren",
+  "ui.clear_the_selection": "Auswahl aufheben",
+  "ui.close": "Schließen",
+  "ui.coil": "Schraube",
+  "ui.coincident": "Koinzident",
+  "ui.collapse": "Einklappen",
+  "ui.collinear": "Kollinear",
+  "ui.combine": "Kombinieren",
+  "ui.coming_later": "bald verfügbar",
+  "ui.concentric": "Konzentrisch",
+  "ui.conic_curve": "Kegelschnitt",
+  "ui.constant": "Konstant",
+  "ui.constraints_conflict": "Bedingungen konfliktreich",
+  "ui.construct": "Konstruktion",
+  "ui.construction": "Konstruktionslinie",
+  "ui.copy": "Kopieren",
+  "ui.counterbore": "Tiefenbohrung",
+  "ui.countersink": "Senkung",
+  "ui.create": "Erstellen",
+  "ui.create_sketch": "Skizze erstellen",
+  "ui.current": "aktuell",
+  "ui.curvature": "Krümmung",
+  "ui.cut": "Ausschneiden",
+  "ui.cylinder": "Zylinder",
+  "ui.dark": "Dunkel",
+  "ui.default_modelling_orientation": "Standard-Modellierungsorientierung",
+  "ui.degrees_of_freedom": "Freiheitsgrade",
+  "ui.delete": "Löschen",
+  "ui.depth": "Tiefe",
+  "ui.design": "Design",
+  "ui.diameter": "Durchmesser",
+  "ui.dimension": "Maß",
+  "ui.direction": "Richtung",
+  "ui.distance": "Abstand",
+  "ui.distance_1": "Abstand 1",
+  "ui.distance_2": "Abstand 2",
+  "ui.document_settings": "Dokumenteneinstellungen",
+  "ui.don_t_save": "Nicht speichern",
+  "ui.draft": "Abziehen",
+  "ui.drawing": "Zeichnung",
+  "ui.drill_point": "Bohrpunkt",
+  "ui.edit": "Bearbeiten",
+  "ui.ellipse": "Ellipse",
+  "ui.end_radius": "Endradius",
+  "ui.equal": "Gleich",
+  "ui.expand": "Aufklappen",
+  "ui.export_ellipsis": "Exportieren...",
+  "ui.extend": "Verlängern",
+  "ui.extent_type": "Ausdehnungstyp",
+  "ui.extrude": "Extrudieren",
+  "ui.features": "Funktionen",
+  "ui.file": "Datei",
+  "ui.fillet": "Vollrundung",
+  "ui.finish_sketch": "Skizze beenden",
+  "ui.fix_unfix": "Fixieren/Lösen",
+  "ui.flat": "Flach",
+  "ui.flip": "Umkehren",
+  "ui.front": "Vorne",
+  "ui.fully_constrained": "Vollständig bestimmt",
+  "ui.general": "Allgemein",
+  "ui.generative_design": "Generatives Design",
+  "ui.graphics": "Grafik",
+  "ui.heading_assemble": "ZUSAMMENBAU",
+  "ui.heading_box": "BLOCK",
+  "ui.heading_chamfer": "ABSCHRÄGUNG",
+  "ui.heading_circular_pattern": "RADIALES MUSTER",
+  "ui.heading_coil": "SCHRAUBE",
+  "ui.heading_combine": "KOMBINIEREN",
+  "ui.heading_construct": "KONSTRUKTION",
+  "ui.heading_create": "ERSTELLEN",
+  "ui.heading_create_sketch": "SKIZZE ERSTELLEN",
+  "ui.heading_cylinder": "ZYLINDER",
+  "ui.heading_design": "DESIGN",
+  "ui.heading_draft": "ABZIEHEN",
+  "ui.heading_edit": "BEARBEITEN",
+  "ui.heading_extrude": "EXTRUDIEREN",
+  "ui.heading_fillet": "VOLLRUNDUNG",
+  "ui.heading_finish_sketch": "SKIZZE BEENDEN",
+  "ui.heading_front": "VORNE",
+  "ui.heading_hole": "BOHRUNG",
+  "ui.heading_home": "START",
+  "ui.heading_insert": "EINFÜGEN",
+  "ui.heading_inspect": "PRÜFEN",
+  "ui.heading_loft": "LOFT",
+  "ui.heading_measure": "Messen",
+  "ui.heading_mesh": "MESH",
+  "ui.heading_mirror": "SPIEGELN",
+  "ui.heading_modify": "ÄNDERN",
+  "ui.heading_move": "VERSCHIEBEN",
+  "ui.heading_offset_plane": "ABSTANDSEBENE",
+  "ui.heading_ok": "OK",
+  "ui.heading_parameters": "PARAMETER",
+  "ui.heading_pattern_on_path": "PFADMUSTER",
+  "ui.heading_pipe": "ROHR",
+  "ui.heading_plane_at_angle": "EBENE IM WINKEL",
+  "ui.heading_plastic": "PLASTIK",
+  "ui.heading_rectangular_pattern": "RECHTECKMUSTER",
+  "ui.heading_revolve": "DREHEN",
+  "ui.heading_right": "RECHTS",
+  "ui.heading_scale": "SKALIEREN",
+  "ui.heading_section_analysis": "QUERSCHNITTSANALYSE",
+  "ui.heading_select": "AUSWÄHLEN",
+  "ui.heading_sheet_metal": "BLECH",
+  "ui.heading_shell": "HÜLLE",
+  "ui.heading_sketch": "SKIZZE",
+  "ui.heading_sketch_palette": "SKIZZENPALETTE",
+  "ui.heading_solid": "KÖRPER",
+  "ui.heading_sphere": "SPHÄRE",
+  "ui.heading_split_body": "KÖRPER TRENNEN",
+  "ui.heading_surface": "FLÄCHE",
+  "ui.heading_sweep": "FÜHREN",
+  "ui.heading_thread": "GEWINDE",
+  "ui.heading_top": "OBEN",
+  "ui.heading_torus": "TORUS",
+  "ui.help": "Hilfe",
+  "ui.hide": "Ausblenden",
+  "ui.hole": "Bohrung",
+  "ui.hole_tap_type": "Gewindetyp",
+  "ui.hole_type": "Bohrungstyp",
+  "ui.home": "Start",
+  "ui.horizontal_vertical": "Horizontal/Vertikal",
+  "ui.insert": "Einfügen",
+  "ui.inspect": "Prüfen",
+  "ui.intersect": "Schnitt",
+  "ui.join": "Verbinden",
+  "ui.joints": "Gelenke",
+  "ui.keyboard_shortcuts": "Tastenkürzel",
+  "ui.language": "Sprache",
+  "ui.length_decimals": "Längen-Dezimalstellen",
+  "ui.light": "Hell",
+  "ui.line": "Linie",
+  "ui.linetype": "Linientyp",
+  "ui.loft": "Loft",
+  "ui.look_at": "Ansehen",
+  "ui.manufacture": "Fertigung",
+  "ui.measure": "Messen",
+  "ui.midpoint": "Mittelpunkt",
+  "ui.mirror": "Spiegeln",
+  "ui.modify": "Ändern",
+  "ui.move": "Verschieben",
+  "ui.multiple": "Mehrfach",
+  "ui.named_views": "Benannte Ansichten",
+  "ui.navigation": "Navigation",
+  "ui.new_body": "Neuer Körper",
+  "ui.new_design": "Neues Design",
+  "ui.normal": "Normal",
+  "ui.object_type": "Objekttyp",
+  "ui.objects": "Objekte",
+  "ui.offer_to_stand_up_y_up_files": "Y-hoch-Dateien aufrecht anbieten",
+  "ui.offset": "Abstand",
+  "ui.offset_plane": "Abstandsebene",
+  "ui.one_side": "Einseitig",
+  "ui.open": "Öffnen",
+  "ui.open_ellipsis": "Öffnen...",
+  "ui.open_recent": "Zuletzt verwendet",
+  "ui.operation": "Operation",
+  "ui.options": "Optionen",
+  "ui.orbit_around": "Umkreisen um",
+  "ui.origin": "Ursprung",
+  "ui.pan_zoom_orbit": "Verschieben, zoomen, umkreisen",
+  "ui.parallel": "Parallel",
+  "ui.parameters": "Parameter",
+  "ui.paste": "Einfügen",
+  "ui.path": "Pfad",
+  "ui.pattern_on_path": "Pfadmuster",
+  "ui.perpendicular": "Senkrecht",
+  "ui.pipe": "Rohr",
+  "ui.placement": "Platzierung",
+  "ui.plane": "Ebene",
+  "ui.plane_at_angle": "Ebene im Winkel",
+  "ui.point": "Punkt",
+  "ui.point_under_the_cursor": "Punkt unter dem Cursor",
+  "ui.points": "Punkte",
+  "ui.polygon": "Polygon",
+  "ui.preferences": "Einstellungen",
+  "ui.profile": "Profil",
+  "ui.profile_plane": "Profilebene",
+  "ui.profiles": "Profile",
+  "ui.project": "Projizieren",
+  "ui.quit": "Beenden",
+  "ui.radius": "Radius",
+  "ui.radius_type": "Radius-Typ",
+  "ui.rectangle": "Rechteck",
+  "ui.rectangular_pattern": "Rechteckmuster",
+  "ui.redo": "Wiederholen",
+  "ui.render": "Rendern",
+  "ui.reset_the_settings_on_this_page": "Einstellungen auf dieser Seite zurücksetzen",
+  "ui.restore_defaults": "Standardeinstellungen wiederherstellen",
+  "ui.reverse_zoom_direction": "Zoomrichtung umkehren",
+  "ui.revolve": "Drehen",
+  "ui.right": "Rechts",
+  "ui.save": "Speichern",
+  "ui.save_as": "Speichern unter",
+  "ui.save_as_ellipsis": "Speichern unter...",
+  "ui.scale": "Skalieren",
+  "ui.section_analysis": "Querschnittsanalyse",
+  "ui.select": "Auswählen",
+  "ui.selection": "Auswahl",
+  "ui.shell": "Hülle",
+  "ui.show": "Einblenden",
+  "ui.show_constraints": "Bedingungen anzeigen",
+  "ui.show_dimensions": "Maße anzeigen",
+  "ui.show_points": "Punkte anzeigen",
+  "ui.show_profile": "Profil anzeigen",
+  "ui.show_projected_geometries": "Projizierte Geometrien anzeigen",
+  "ui.simple": "Einfach",
+  "ui.simulation": "Simulation",
+  "ui.single": "Einzel",
+  "ui.sketch": "Skizze",
+  "ui.sketch_dimension": "Skizzenmaß",
+  "ui.sketch_grid": "Skizzenraster",
+  "ui.sketch_scale": "Skizzenskalierung",
+  "ui.sketches": "Skizzen",
+  "ui.slice": "Scheibe",
+  "ui.slot": "Langloch",
+  "ui.smooth": "Glatt",
+  "ui.snap": "Einrasten",
+  "ui.sphere": "Sphäre",
+  "ui.spline": "Spline",
+  "ui.split_body": "Körper trennen",
+  "ui.start": "Start",
+  "ui.start_radius": "Startradius",
+  "ui.sweep": "Führen",
+  "ui.symmetric": "Symmetrisch",
+  "ui.symmetry": "Symmetrie",
+  "ui.system": "System",
+  "ui.tangent": "Tangential",
+  "ui.taper_angle": "Kegelwinkel",
+  "ui.tapped": "Gewindebohrung",
+  "ui.text": "Text",
+  "ui.theme": "Design",
+  "ui.thickness": "Dicke",
+  "ui.thread": "Gewinde",
+  "ui.tip_angle": "Spitzenwinkel",
+  "ui.to_object": "Bis Objekt",
+  "ui.top": "Oben",
+  "ui.torus": "Torus",
+  "ui.trim": "Kürzen",
+  "ui.two_sides": "Beidseitig",
+  "ui.ui_scale": "UI-Skalierung",
+  "ui.undo": "Rückgängig",
+  "ui.units": "Einheiten",
+  "ui.units_of_new_designs": "Einheiten für neue Designs",
+  "ui.untitled": "Ohne Titel",
+  "ui.variable": "Variabel",
+  "ui.view_centre": "Ansichtszentrum",
+  "ui.visual_style": "Ansichtsstil",
+  "ui.workspace": "Arbeitsbereich",
+  "ui.zoom_to_the_cursor": "Zum Cursor zoomen"
+}

crates/ui-egui/src/toolbar.rs

@@ -542,29 +542,41 @@ pub fn toolbar(app: &mut SolveApp, ui: &mut egui::Ui) {
                         } else if cmds.is_empty() {
                             ui.label(egui::RichText::new("Not available yet").color(t.text_dim));
                         }
+                        let row_w = dropdown_width(app, ui, &cmds);
+                        // Up and Down move the keyboard focus through the enabled rows (from none
+                        // focused: the first or the last), instead of egui's own spatial move.
+                        let (down, up) = ui.input(|i| (i.key_pressed(egui::Key::ArrowDown), i.key_pressed(egui::Key::ArrowUp)));
+                        if down || up {
+                            let enabled: Vec<&str> = cmds.iter().filter(|c| c.info(&app.session).enabled).map(|c| c.id).collect();
+                            let focused = ui.ctx().memory(|m| m.focused());
+                            let at = enabled.iter().position(|id| focused == Some(dropdown_row_id(ui, id)));
+                            let n = enabled.len();
+                            let next = match (at, down) {
+                                (None, true) => Some(0),
+                                (None, false) => n.checked_sub(1),
+                                (Some(i), true) => Some((i + 1) % n.max(1)),
+                                (Some(i), false) => Some((i + n.max(1) - 1) % n.max(1)),
+                            };
+                            if let Some(id) = next.and_then(|i| enabled.get(i)) {
+                                ui.ctx().memory_mut(|m| {
+                                    m.request_focus(dropdown_row_id(ui, id));
+                                    m.move_focus(egui::FocusDirection::None);
+                                });
+                            }
+                        }
                         for c in &cmds {
-                            let info = c.info(&app.session);
-                            ui.horizontal(|ui| {
-                                let (ir, _) = ui.allocate_exact_size(vec2(18.0, 18.0), Sense::hover());
-                                icons::paint(ui.painter(), ir, c.icon, t.icon, t.icon_fill, t.accent);
-                                let b = ui.add_enabled(
-                                    info.enabled,
-                                    egui::Button::new(app.tr_label(c.label)).frame(false).shortcut_text(c.shortcut.unwrap_or("")),
-                                );
-                                crate::scenario::publish_handle(&format!("toolbar:{}", c.id), b.rect.center());
-                                if b.secondary_clicked() {
-                                    menu = Some((b.interact_pointer_pos().unwrap_or(b.rect.left_bottom()), c.id));
-                                }
-                                if b.clicked() {
-                                    let id = c.id;
-                                    app.start(id);
+                            match dropdown_row(app, ui, c, row_w) {
+                                RowAction::None => {}
+                                RowAction::Menu(at) => menu = Some((at, c.id)),
+                                RowAction::Start => {
+                                    app.start(c.id);
                                     ui.ctx().data_mut(|d| d.remove::<egui::Id>(egui::Id::new("sc_panel_open")));
                                 }
-                            });
+                            }
                         }
                     });
                 });
-                if area.response.clicked_elsewhere() && !lresp.clicked() {
+                if (area.response.clicked_elsewhere() && !lresp.clicked()) || ui.input(|i| i.key_pressed(egui::Key::Escape)) {
                     ui.ctx().data_mut(|d| d.remove::<egui::Id>(egui::Id::new("sc_panel_open")));
                 }
             }
@@ -608,6 +620,72 @@ pub fn toolbar(app: &mut SolveApp, ui: &mut egui::Ui) {
     });
 }
 
+/// What a click on a panel drop-down row asks for.
+enum RowAction {
+    None,
+    Start,
+    Menu(egui::Pos2),
+}
+
+const ROW_H: f32 = 24.0;
+
+/// The id of a drop-down row (for keyboard focus).
+fn dropdown_row_id(ui: &egui::Ui, id: &str) -> egui::Id {
+    ui.id().with(("dropdown_row", id))
+}
+
+/// How wide a panel drop-down's rows are: the widest label and shortcut, at least 200.
+fn dropdown_width(app: &SolveApp, ui: &egui::Ui, cmds: &[&'static solvecraft_engine::CommandSpec]) -> f32 {
+    let t = Tokens::get();
+    let font = FontId::proportional(13.0);
+    cmds.iter()
+        .map(|c| {
+            let label = ui.painter().layout_no_wrap(app.tr_label(c.label).to_string(), font.clone(), t.text).size().x;
+            let key = c.shortcut.map(|k| ui.painter().layout_no_wrap(k.to_string(), font.clone(), t.text).size().x + 24.0).unwrap_or(0.0);
+            6.0 + 18.0 + 8.0 + label + key + 30.0
+        })
+        .fold(200.0, f32::max)
+}
+
+/// One command row of a panel drop-down: icon, label and shortcut, with the hover background
+/// under the pointer or keyboard focus (like every menu).
+fn dropdown_row(app: &SolveApp, ui: &mut egui::Ui, c: &'static solvecraft_engine::CommandSpec, width: f32) -> RowAction {
+    let t = Tokens::get();
+    let info = c.info(&app.session);
+    let (rect, _) = ui.allocate_exact_size(vec2(width, ROW_H), Sense::hover());
+    let sense = if info.enabled { Sense::click() } else { Sense::hover() };
+    let resp = ui.interact(rect, dropdown_row_id(ui, c.id), sense);
+    let label = app.tr_label(c.label).to_string();
+    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, ui.is_enabled() && info.enabled, &label));
+    crate::scenario::publish_handle(&format!("toolbar:{}", c.id), rect.center());
+    crate::scenario::publish_handle(&format!("dropdown:{}", c.id), rect.center());
+    let hot = info.enabled && (resp.hovered() || resp.has_focus());
+    let p = ui.painter();
+    if hot {
+        p.rect_filled(rect, 3.0, t.hover);
+        crate::scenario::publish_handle(&format!("dropdown_hot:{}", c.id), rect.center());
+    }
+    let (ink, fill, acc, text) =
+        if info.enabled { (t.icon, t.icon_fill, t.accent, t.text) } else { (t.border, t.panel_header, t.border, t.text_dim) };
+    let ir = Rect::from_center_size(pos2(rect.left() + 6.0 + 9.0, rect.center().y), vec2(18.0, 18.0));
+    icons::paint(p, ir, c.icon, ink, fill, acc);
+    p.text(pos2(ir.right() + 8.0, rect.center().y), Align2::LEFT_CENTER, &label, FontId::proportional(13.0), text);
+    if let Some(k) = c.shortcut {
+        p.text(pos2(rect.right() - 8.0, rect.center().y), Align2::RIGHT_CENTER, k, FontId::proportional(13.0), t.text_dim);
+    }
+    let resp = match &info.disabled_reason {
+        Some(why) if !info.enabled => resp.on_hover_text(why),
+        _ => resp,
+    };
+    if resp.secondary_clicked() {
+        return RowAction::Menu(resp.interact_pointer_pos().unwrap_or(rect.left_bottom()));
+    }
+    if resp.clicked() && info.enabled {
+        return RowAction::Start;
+    }
+    RowAction::None
+}
+
 /// A toolbar button being dragged (its command id).
 #[derive(Clone, Copy, Debug)]
 struct ToolbarDrag(&'static str);

crates/ui-egui/src/tools.rs

@@ -326,7 +326,25 @@ fn run_shape(app: &mut SolveApp, t: &Tool) -> Result<Vec<String>, String> {
 /// Only consume a complete, unambiguous selection; command validation owns geometry.
 pub(crate) fn constraint_preselection(command: &str, selection: &[solvecraft_engine::Sel]) -> Option<Value> {
     use solvecraft_engine::Sel::{SketchCurve, SketchPoint};
+    let selected_ids = |curves_only: bool, minimum: usize| -> Option<Vec<&str>> {
+        if !(minimum..=200).contains(&selection.len()) {
+            return None;
+        }
+        let ids: Vec<&str> = selection
+            .iter()
+            .map(|s| match s {
+                SketchCurve { id } => Some(id.as_str()),
+                SketchPoint { id } if !curves_only => Some(id.as_str()),
+                _ => None,
+            })
+            .collect::<Option<_>>()?;
+        let unique: std::collections::BTreeSet<_> = ids.iter().copied().collect();
+        (unique.len() == ids.len()).then_some(ids)
+    };
     match (command, selection) {
+        ("sketch.constraint.fix", _) => selected_ids(false, 1).map(|ids| json!({"entities":ids})),
+        ("sketch.constraint.polygon", _) => selected_ids(true, 3).map(|ids| json!({"lines":ids})),
+        ("sketch.constraint.curvature", [SketchCurve { id: a }, SketchCurve { id: b }]) if a != b => Some(json!({"a":a,"b":b})),
         ("sketch.constraint.horizontal_vertical", [SketchCurve { id }]) => Some(json!({"line":id})),
         ("sketch.constraint.horizontal_vertical", [SketchPoint { id: a }, SketchPoint { id: b }]) if a != b => Some(json!({"points":[a,b]})),
         ("sketch.constraint.coincident", [a, b]) => {

crates/ui-egui/tests/constraint_preselection.rs

@@ -146,3 +146,106 @@ fn rejected_preselection_preserves_document_and_error() {
     assert!(!h.app.status.as_ref().is_some_and(|(_, _, error)| *error));
     assert!(h.app.session.selection.is_empty());
 }
+
+#[test]
+fn curvature_polygon_and_fix_consume_clicked_operands_atomically() {
+    for command in ["fix", "curvature", "polygon"] {
+        let mut h = Harness::new();
+        h.app.run("sketch.create", json!({"plane":"XY"})).unwrap();
+        let picks = match command {
+            "curvature" => {
+                h.app.run("sketch.line", json!({"points":[[10,10],[30,10]],"infer":false})).unwrap();
+                h.app.run("sketch.spline.control_point", json!({"points":["l1.end",[40,12],[50,16],[60,25]]})).unwrap();
+                vec![[20., 10.], [45., 14.875]]
+            }
+            "polygon" => {
+                h.app.run("sketch.line", json!({"points":[[10,10],[40,10],[40,30],[10,30]],"closed":true,"infer":false})).unwrap();
+                vec![[25., 10.], [40., 20.], [25., 30.], [10., 20.]]
+            }
+            _ => {
+                h.app.run("sketch.line", json!({"points":[[10,10],[40,10]],"infer":false})).unwrap();
+                h.app.run("sketch.point", json!({"point":[20,25],"id":"p"})).unwrap();
+                vec![[25., 10.], [20., 25.]]
+            }
+        };
+        h.call("ui.view", json!({"view":"top"}));
+        h.app.cam.distance = 80.0;
+        h.app.cam.target = solvecraft_engine::geom::Vec3::new(30.0, 15.0, 0.0);
+        h.settle();
+        for (i, p) in picks.iter().enumerate() {
+            h.step(&json!({"click":{"sketch":p},"shift":i>0})).unwrap();
+        }
+        assert_eq!(h.app.session.selection.len(), picks.len(), "{command}: {:?}", h.app.session.selection);
+        let before = h.app.session.doc.to_json();
+        let undo = h.app.session.undo.len();
+        h.step(&json!({"start":format!("sketch.constraint.{command}")})).unwrap();
+        assert!(!h.app.status.as_ref().is_some_and(|(_, _, error)| *error), "{command}: {:?}", h.app.status);
+        assert!(h.app.tool.is_none());
+        assert!(h.app.session.selection.is_empty());
+        assert_eq!(h.app.session.undo.len(), undo + 1);
+        let st = h.app.session.world_state();
+        let sk = &st.sketch(h.app.session.active_sketch.unwrap()).unwrap().sketch;
+        assert!(sk.constraints.iter().any(|c| match command {
+            "fix" => matches!(c.kind, ConstraintKind::Fix { .. }),
+            "curvature" => matches!(c.kind, ConstraintKind::Smooth { .. }),
+            _ => matches!(c.kind, ConstraintKind::Equal { .. }),
+        }));
+        match command {
+            "fix" => {
+                assert!(sk.curve_locked(sk.curve_index("l1").unwrap()));
+                assert!(sk.point_locked(sk.resolve_point("p").unwrap()));
+            }
+            "curvature" => {
+                let spline = sk.curves.iter().find(|c| c.id != "l1").unwrap();
+                let pts: Vec<_> = spline.kind.point_ids().iter().map(|i| sk.point(*i).unwrap()).collect();
+                let line = sk.polyline(sk.curve_index("l1").unwrap());
+                let direction = (line[1] - line[0]).normalized().unwrap();
+                assert!((pts[1] - pts[0]).cross(direction).abs() < 1e-5);
+                assert!((pts[2] - pts[1]).cross(pts[1] - pts[0]).abs() < 1e-3);
+            }
+            _ => {
+                let lengths: Vec<_> = ["l1", "l2", "l3", "l4"]
+                    .iter()
+                    .map(|id| {
+                        let pts = sk.polyline(sk.curve_index(id).unwrap());
+                        pts[0].dist(pts[1])
+                    })
+                    .collect();
+                assert!(lengths[0] > 1.0);
+                assert!(lengths.iter().all(|l| (l - lengths[0]).abs() < 1e-6));
+            }
+        }
+        assert!(st.sketch(h.app.session.active_sketch.unwrap()).unwrap().report.ok());
+        let after = h.app.session.doc.to_json();
+        h.app.run("edit.undo", json!({})).unwrap();
+        assert_eq!(h.app.session.doc.to_json(), before);
+        h.app.run("edit.redo", json!({})).unwrap();
+        assert_eq!(h.app.session.doc.to_json(), after);
+    }
+}
+
+#[test]
+fn remaining_constraints_preserve_mixed_selections_and_rejected_geometry() {
+    for command in ["fix", "curvature", "polygon"] {
+        let mut h = lines();
+        let before = h.app.session.doc.to_json();
+        let undo = h.app.session.undo.len();
+        let mixed = vec![Sel::SketchCurve { id: "l1".into() }, Sel::Body { name: "missing".into() }];
+        h.app.session.selection = mixed.clone();
+        h.step(&json!({"start":format!("sketch.constraint.{command}")})).unwrap();
+        assert!(h.app.tool.is_some());
+        assert_eq!(h.app.session.selection, mixed);
+        assert_eq!(h.app.session.doc.to_json(), before);
+        assert_eq!(h.app.session.undo.len(), undo);
+    }
+    let mut h = lines();
+    let selection = vec![Sel::SketchCurve { id: "l1".into() }, Sel::SketchCurve { id: "missing".into() }];
+    h.app.session.selection = selection.clone();
+    let before = h.app.session.doc.to_json();
+    let undo = h.app.session.undo.len();
+    h.step(&json!({"start":"sketch.constraint.curvature"})).unwrap();
+    assert!(h.app.status.as_ref().is_some_and(|(_, _, error)| *error));
+    assert_eq!(h.app.session.selection, selection);
+    assert_eq!(h.app.session.doc.to_json(), before);
+    assert_eq!(h.app.session.undo.len(), undo);
+}

crates/ui-egui/tests/scenarios/s46_toolbar_dropdown_hover.json

@@ -0,0 +1,75 @@
+[
+ {
+  "note": "#288: a panel drop-down highlights the row under the pointer with the hover background, and the row with keyboard focus. Drop-down rows publish `dropdown:<command id>`, the highlighted one also `dropdown_hot:<command id>`."
+ },
+ {
+  "click": {
+   "handle": "panel:SOLID:CREATE"
+  }
+ },
+ {
+  "expect": {
+   "shown_handles": ["dropdown:solid.box", "dropdown:solid.sphere"],
+   "hidden_handles": ["dropdown_hot:solid.box", "dropdown_hot:solid.sphere"]
+  }
+ },
+ {
+  "move": {
+   "handle": "dropdown:solid.box"
+  }
+ },
+ {
+  "expect": {
+   "shown_handles": ["dropdown_hot:solid.box"],
+   "hidden_handles": ["dropdown_hot:solid.sphere", "dropdown_hot:solid.cylinder"]
+  }
+ },
+ {
+  "move": {
+   "handle": "dropdown:solid.sphere"
+  }
+ },
+ {
+  "expect": {
+   "shown_handles": ["dropdown_hot:solid.sphere"],
+   "hidden_handles": ["dropdown_hot:solid.box"]
+  }
+ },
+ {
+  "move": [700, 600]
+ },
+ {
+  "expect": {
+   "shown_handles": ["dropdown:solid.box"],
+   "hidden_handles": ["dropdown_hot:solid.sphere", "dropdown_hot:solid.box"]
+  }
+ },
+ {
+  "note": "The keyboard: Down focuses the first row, Down again the next; the highlight follows."
+ },
+ {
+  "key": "ArrowDown"
+ },
+ {
+  "expect": {
+   "shown_handles": ["dropdown_hot:sketch.create"]
+  }
+ },
+ {
+  "key": "ArrowDown"
+ },
+ {
+  "expect": {
+   "shown_handles": ["dropdown_hot:solid.extrude"],
+   "hidden_handles": ["dropdown_hot:sketch.create"]
+  }
+ },
+ {
+  "key": "Enter"
+ },
+ {
+  "expect": {
+   "hidden_handles": ["dropdown:solid.box"]
+  }
+ }
+]

docs/releasing.md

@@ -54,7 +54,7 @@ deployment. The stable Flatpak repository is not automatically updated with nigh
 2. Update `[workspace.package] version` in root `Cargo.toml`. Then run
    `cargo metadata --format-version 1 --no-deps > /dev/null` to refresh workspace package
    versions in `Cargo.lock`. Inspect the diff and keep unrelated dependency changes out.
-   SolidCraft does not currently implement the siblings' `cargo xtask version set` command.
+   SolidCraft does not currently implement `cargo xtask version set`.
 3. Run `cargo xtask ci` and the packaging checks in `.github/workflows/packaging-lint.yml`.
    Commit the version files through the normal review flow and land them on `main`.
    Do not use `[skip ci]`. Record the exact commit SHA to release. If it changes, revalidate it.

vendor/README.md

@@ -7,6 +7,9 @@ are marked `SolveCraft:` in the source.
 ## truck-shapeops 0.4.0 (Apache-2.0, © RICOS Co. Ltd., https://github.com/ricosjp/truck)
 
 Changes:
+- `transversal/intersection_curve/mod.rs`: reject empty/single-point polylines and
+  collapsed or non-finite segments before endpoint indexing and normalization. A hidden
+  constructor re-export lets the kernel workspace tests exercise the actual vendored code.
 - `transversal/integrate/mod.rs`: mesh both shells with `robust_triangulation` (faces made by
   earlier booleans have boundaries that lie on their surface only within tolerance).
 - `transversal/divide_face/mod.rs`: when projecting a loop onto a face's surface, fall back to

vendor/truck-shapeops/src/lib.rs

@@ -34,4 +34,7 @@ mod healing;
 pub use healing::{RobustSplitClosedEdgesAndFaces, SplitClosedEdgesAndFaces};
 mod transversal;
 pub use transversal::{and, or, ShapeOpsCurve, ShapeOpsSurface};
+// SolveCraft: exercised by kernel regressions in the workspace CI.
+#[doc(hidden)]
+pub use transversal::IntersectionCurveWithParameters;
 mod alternative;

vendor/truck-shapeops/src/transversal/intersection_curve/mod.rs

@@ -19,12 +19,21 @@ impl<S> From<IntersectionCurveWithParameters<S>> for IntersectionCurve<PolylineC
 impl<S> IntersectionCurveWithParameters<S>
 where S: ParametricSurface3D + SearchNearestParameter<D2, Point = Point3>
 {
+    /// SolveCraft: construct a projected curve, returning `None` for degenerate input.
     pub fn try_new(
         surface0: S,
         surface1: S,
         poly: PolylineCurve<Point3>,
         tol: f64,
     ) -> Option<Self> {
+        // SolveCraft: a point contact is not a curve. Reject it before indexing the
+        // endpoints, and reject collapsed/non-finite segments before normalizing.
+        if poly.len() < 2 || poly.windows(2).any(|p| {
+            let length2 = (p[1] - p[0]).magnitude2();
+            !length2.is_finite() || length2 <= 0.0
+        }) {
+            return None;
+        }
         let mut polyline = PolylineCurve(Vec::new());
         let mut params0 = PolylineCurve(Vec::new());
         let mut params1 = PolylineCurve(Vec::new());

vendor/truck-shapeops/src/transversal/mod.rs

@@ -2,6 +2,9 @@ mod divide_face;
 mod faces_classification;
 mod integrate;
 mod intersection_curve;
+// SolveCraft: expose the constructor for workspace regression coverage of the vendored fix.
+#[doc(hidden)]
+pub use intersection_curve::IntersectionCurveWithParameters;
 mod loops_store;
 mod polyline_construction;
 pub use integrate::{and, or, ShapeOpsCurve, ShapeOpsSurface};