M3.97: freeform points drag out to delete, spread ring drags, Lines mode draws lines

With the Gradient tool on a freeform gradient the selected point shows its
spread as a dashed ring with a handle; dragging either sets the spread. A
point dragged out of the object is removed on release, and double-clicking a
point opens the gradientStop popover, which now edits the selected freeform
point (colour, opacity, spread). In Lines mode successive clicks draw one
smooth line (with a rubber band to the pointer); clicking an existing point
continues the line from it, and Escape or a click off the art ends it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/cmd/freeform.rs

@@ -5,7 +5,7 @@
 use serde_json::{Value, json};
 use vectorcraft_color::freeform::spread_scale;
 use vectorcraft_color::{Freeform, FreeformMode, FreeformPoint, GradientKind, Paint};
-use vectorcraft_doc::{Node, NodeKind};
+use vectorcraft_doc::NodeKind;
 use vectorcraft_geom::{Affine, Rect};
 
 use super::appearance::{edit_items, edits_stroke, index_param, item_target};
@@ -323,10 +323,3 @@ fn get(s: &mut Session, p: &Value) -> Result<Value> {
     v["selected"] = json!(selected);
     Ok(v)
 }
-
-/// Whether `n`'s shape contains `p` (its filled regions; true for objects without them, such as
-/// type, whose boxes stand in).
-pub(crate) fn inside_fn(n: &Node) -> impl Fn(vectorcraft_geom::Point) -> bool + use<> {
-    let shapes = n.clip_shapes(None);
-    move |p| shapes.is_empty() || shapes.iter().any(|(bp, rule)| vectorcraft_geom::hit::fill_contains(bp, *rule, p))
-}

crates/engine/src/cmd/gradient.rs

@@ -357,7 +357,7 @@ fn edit_gradient(s: &mut Session, p: &Value) -> Result<Value> {
         }
         let b = item_paint_bounds(n, index, !stroke);
         // Only a gradient turning freeform needs the shape (its first points go inside it).
-        let inside = (freeform && b.is_some()).then(|| super::freeform::inside_fn(n));
+        let inside = (freeform && b.is_some()).then(|| n.contains_fn());
         let inside: &dyn Fn(Point) -> bool = match &inside {
             Some(f) => f,
             None => &|_| true,

crates/engine/src/tests_freeform.rs

@@ -61,7 +61,7 @@ fn the_first_application_places_points_inside_the_shape() {
     let g = fill_gradient(&s, id);
     assert_eq!(g.gradient.kind, GradientKind::Freeform);
     let f = g.freeform.as_ref().unwrap();
-    let inside = cmd::freeform::inside_fn(node(&s, id));
+    let inside = node(&s, id).contains_fn();
     assert!(f.points.len() >= 4 && f.points.iter().all(|p| inside(p.at)), "{:?}", f.points);
     // The stops follow the points' colours (swatch chips and exports show them).
     assert_eq!(g.gradient.stops.iter().map(|st| st.color).collect::<Vec<_>>(), f.points.iter().map(|p| p.color).collect::<Vec<_>>());