fix(ui): Extrude and Revolve leave Profiles empty when the last sketch is already used (#684) (#705)

With nothing selected, Extrude and Revolve no longer pre-pick the last sketch's profile when a feature already builds from it, so OK no longer cuts into a part nobody picked. Fixes #684.

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

crates/ui-egui/src/dialogs.rs

@@ -572,7 +572,8 @@ impl Dialog {
                 _ => None,
             });
         }
-        // With nothing pre-selected, a single profile in the sketch being used is taken.
+        // With nothing pre-selected, a single profile in the sketch being used is taken (#684:
+        // not one a feature already builds from).
         if matches!(d.kind, Kind::Extrude { .. } | Kind::Revolve { .. })
             && let Some(inp) = d.inputs.first_mut()
             && inp.items.is_empty()
@@ -785,16 +786,25 @@ impl Dialog {
     }
 }
 
-/// Profiles of the sketch a feature would use (active, else the last), when there is just one.
+/// Profiles of the sketch a feature would use, when there is just one: the active sketch's, else
+/// the last sketch's while no feature builds from it yet. A used profile (a cube's sketch on its
+/// bottom face) is only taken when it is picked.
 fn default_profiles(s: &Session) -> Vec<Sel> {
     let st = s.world_state();
-    let sid = s.active_sketch.or_else(|| s.doc.features.iter().rev().find(|f| matches!(f.kind, FeatureKind::Sketch { .. })).map(|f| f.id));
+    let sid = s.active_sketch.or_else(|| {
+        s.doc.features.iter().rev().find(|f| matches!(f.kind, FeatureKind::Sketch { .. })).map(|f| f.id).filter(|&id| !profiles_used(s, id))
+    });
     match sid.and_then(|id| st.sketch(id).map(|ss| (id, ss.profiles.len()))) {
         Some((id, 1)) => vec![Sel::Profile { sketch: id, index: 0 }],
         _ => Vec::new(),
     }
 }
 
+/// Does a feature build from this sketch's profiles (extrude, revolve, sweep, loft, emboss…)?
+fn profiles_used(s: &Session, sketch: u64) -> bool {
+    s.doc.features.iter().any(|f| f.kind.profile_sels().iter().any(|(id, _)| *id == sketch))
+}
+
 /// The plane of a planar body face: (point on it, unit normal).
 pub fn planar_face(s: &Session, body: &str, face: usize) -> Option<(Vec3, Vec3)> {
     let st = s.world_state();