Fillets and chamfers keep their edges through upstream edits: each picked edge remembers its direction and its body's bounding box when picked (Feature.edge_refs, set by the commands and by timeline.edit); a reference point that is off every edge after an edit is carried to the same place in the body as it is now and kept when an edge running the same way is there (QA s06: a fillet on the right top edge follows the edge when the sketch widens); otherwise the nearest edge with a warning as before

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/doc/src/document.rs

@@ -1011,6 +1011,10 @@ pub struct Feature {
     /// The component the feature (and what it makes) belongs to; 0 = the root.
     #[serde(default, skip_serializing_if = "is_root")]
     pub component: u64,
+    /// For each picked edge (fillets, chamfers): where it sat in its body when picked, so it
+    /// is found again when earlier edits move or resize the body.
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub edge_refs: Vec<crate::EdgeRef>,
     #[serde(flatten)]
     pub kind: FeatureKind,
 }
@@ -1271,7 +1275,7 @@ impl Document {
             Some(n) if !n.trim().is_empty() => n.trim().to_string(),
             _ => self.unique_name(kind.base_name()),
         };
-        let f = Feature { id, name, suppressed: false, body_names: Vec::new(), param_names: Vec::new(), component: 0, kind };
+        let f = Feature { id, name, suppressed: false, body_names: Vec::new(), param_names: Vec::new(), component: 0, edge_refs: Vec::new(), kind };
         match self.marker {
             Some(m) if m < self.features.len() => {
                 self.features.insert(m, f);