CAD: deliver the picked sketch ENTITY to the panel, and point Rib at it (snaporca-3648)

Ported from snaporca 94b6b564de. See that commit for what is and is not measured.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/slic3r/GUI/DesignCanvas.cpp

@@ -581,7 +581,7 @@ void DesignCanvas::set_on_sketch_face_selected(std::function<void(int)> cb)
     m_sketch_tool.on_face_selected = std::move(cb);
 }
 
-void DesignCanvas::set_on_display_sketch_selected(std::function<void(int, int)> cb)
+void DesignCanvas::set_on_display_sketch_selected(std::function<void(int, int, int)> cb)
 {
     m_sketch_tool.on_display_sketch_selected = std::move(cb);
 }

src/slic3r/GUI/DesignCanvas.hpp

@@ -79,7 +79,7 @@ public:
     // Sketch selection (Mode::Select).
     void set_on_sketch_selection_changed(std::function<void(int)> cb);
     void set_on_sketch_face_selected(std::function<void(int)> cb);  // closed loop clicked: region index passed
-    void set_on_display_sketch_selected(std::function<void(int, int)> cb);  // committed loop clicked: (feature, region)
+    void set_on_display_sketch_selected(std::function<void(int, int, int)> cb);  // committed loop clicked: (feature, region, entity)
     void set_on_display_sketch_activated(std::function<void(int)> cb);      // committed sketch DOUBLE-clicked: edit it
     std::vector<SketchEntity> selected_loop_entities() const;  // entities of the click-selected loop
     std::vector<std::vector<int>> region_entity_indices(const std::vector<SketchEntity>& ents) const;

src/slic3r/GUI/DesignPanel.cpp

@@ -3358,7 +3358,7 @@ DesignPanel::DesignPanel(wxWindow* parent)
     // Clicking a committed sketch loop on the plate (no live session) selects THAT loop:
     // the viewport highlights only it (cyan) and its Sketch feature's tree row is selected.
     // The (feature, region) pair is remembered so Extrude builds just that one loop.
-    m_viewport->set_on_display_sketch_selected([this](int feat, int region) {
+    m_viewport->set_on_display_sketch_selected([this](int feat, int region, int entity) {
         if (feat < 0 || feat >= int(m_doc.features.size())) return;
         m_sel_sketch_feat   = feat;
         m_sel_sketch_region = region;
@@ -3366,6 +3366,23 @@ DesignPanel::DesignPanel(wxWindow* parent)
         // any stale solid face/edge pick so Extrude treats this loop as the profile.
         m_sel_solid_face = m_sel_solid_edge = -1;
         m_pick_face = m_pick_face_body = -1;
+        // Rib card open: point at the LINE, do not type its index. 'Entity index' was a bare
+        // wxSpinCtrl ranged 0-999 standing in for a line sitting visible on screen, with nothing
+        // anywhere telling you which integer was which — the purest case of the thing this epic
+        // exists to remove. Only a stroke hit carries an entity (an interior click is a region,
+        // not a line), so a click inside a loop deliberately leaves the field alone rather than
+        // resetting it to something arbitrary. The sketch picker follows the same pick, so
+        // pointing at a line in a different sketch retargets both together. snaporca-3648.
+        if (m_active == Tool::Rib && entity >= 0) {
+            if (m_rib_sketch != nullptr)
+                for (unsigned i = 0; i < m_rib_sketch->GetCount(); ++i)
+                    if (int(reinterpret_cast<intptr_t>(m_rib_sketch->GetClientData(i))) == feat) {
+                        m_rib_sketch->SetSelection(i);
+                        break;
+                    }
+            if (m_rib_entity != nullptr) m_rib_entity->SetValue(entity);
+            refresh_preview();
+        }
         // Sweep card open: the sketch you point at becomes the PATH. The profile is already
         // settled selection-first — you pick a sketch and then invoke Sweep, which is the design
         // law's own canonical example — so the path is the input that was still trapped in a

src/slic3r/GUI/DesignSketchTool.cpp

@@ -2852,8 +2852,11 @@ void DesignSketchTool::hit_display_sketch(const DisplaySketch& d, const Vec2d& p
             if (h >= 0 && h < int(loops.size()) && point_in_poly(p, loops[h].poly)) { in_hole = true; break; }
         if (!in_hole) { face_feat = d.feature; face_reg = r; }
     }
-    dp_pick_trace("region hit -> feat=%d reg=%d (edge_feat=%d edge_reg=%d)",
-                  face_feat, face_reg, edge_feat, edge_reg);
+    // edge_ent is printed because it is now DELIVERED (snaporca-3648) — a tool can ask for the
+    // line you pointed at, not just its loop, and "which entity did that click resolve to" is
+    // otherwise unanswerable from outside.
+    dp_pick_trace("region hit -> feat=%d reg=%d (edge_feat=%d edge_reg=%d edge_ent=%d)",
+                  face_feat, face_reg, edge_feat, edge_reg, edge_ent);
 }
 
 std::vector<SketchEntity> DesignSketchTool::selected_loop_entities() const
@@ -8947,7 +8950,7 @@ bool DesignSketchTool::on_mouse_impl(wxMouseEvent& evt, GLCanvas3D& canvas)
         // A precise hit on a loop outline wins over the solid face beneath it.
         if (edge_feat >= 0) {
             m_display_pick = edge_feat; m_display_pick_region = edge_reg;
-            if (on_display_sketch_selected) on_display_sketch_selected(edge_feat, edge_reg);
+            if (on_display_sketch_selected) on_display_sketch_selected(edge_feat, edge_reg, edge_ent);
             return true;
         }
         // No loop stroke under the cursor: the solid is the foreground (whole/face/edge cycle).
@@ -8955,7 +8958,7 @@ bool DesignSketchTool::on_mouse_impl(wxMouseEvent& evt, GLCanvas3D& canvas)
         // Interior of a committed loop with no solid behind it.
         if (face_feat >= 0) {
             m_display_pick = face_feat; m_display_pick_region = face_reg;
-            if (on_display_sketch_selected) on_display_sketch_selected(face_feat, face_reg);
+            if (on_display_sketch_selected) on_display_sketch_selected(face_feat, face_reg, -1);
             return true;
         }
         m_display_pick = -1; m_display_pick_region = -1;  // clicked bare plate -> drop highlight

src/slic3r/GUI/DesignSketchTool.hpp

@@ -195,7 +195,10 @@ public:
     std::function<void(int level, int body, int face, int edge)> on_solid_selection_changed;
     // Click a committed sketch overlay (no live session) -> select that loop: the Sketch
     // feature index + the clicked closed-region index within it (-1 = no specific loop).
-    std::function<void(int feature, int region)> on_display_sketch_selected;
+    // entity = the sketch entity index under the cursor when the click landed on a loop
+    // STROKE, else -1 for an interior/region hit. Carried because a tool can legitimately
+    // want the LINE you pointed at, not just the loop it belongs to (Rib, snaporca-3648).
+    std::function<void(int feature, int region, int entity)> on_display_sketch_selected;
     // Double-click on a committed sketch stroke: open THAT feature for editing. Selecting a line
     // and then hunting for an Edit button in a panel is the dependency this tab exists to remove.
     std::function<void(int feature)> on_display_sketch_activated;