Have svg tags with IfcColumn/IfcBeam classes always on top.

discussion: https://community.osarch.org/discussion/2572/a-clever-way-to-get-a-column-buried-in-a-wall-to-still-read-when-you-print-a-drawing

src/bonsai/bonsai/bim/module/drawing/operator.py

@@ -748,9 +748,11 @@ class CreateDrawing(bpy.types.Operator):
             self.remove_cut_linework(root)
             self.generate_bisect_linework(context, root)
             self.merge_linework_and_add_metadata(root)
+            self.move_elements_to_top(root)
         elif self.camera.data.BIMCameraProperties.cut_mode == "OPENCASCADE":
             self.move_projection_to_bottom(root)
             self.merge_linework_and_add_metadata(root)
+            self.move_elements_to_top(root)
 
         if self.camera.data.BIMCameraProperties.fill_mode == "SHAPELY":
             # shapely variant
@@ -1314,6 +1316,22 @@ class CreateDrawing(bpy.types.Operator):
         for projection in projections:
             projection.getparent().remove(projection)
             group.insert(0, projection)
+    
+    def move_elements_to_top(self, root):
+        group = root.find("{http://www.w3.org/2000/svg}g")
+        
+        #TODO:  don't hardcode, make the following an assignable preference
+        classes_to_move = ['IfcColumn', 'IfcBeam']
+        
+        xpath_query = " or ".join([f"contains(@class, '{name}')" for name in classes_to_move])
+        full_xpath = f".//svg:g[{xpath_query}]"
+        
+        elements_to_top = root.xpath(full_xpath, namespaces={"svg": "http://www.w3.org/2000/svg"})
+        
+        for element in elements_to_top:
+            element.getparent().remove(element)
+            group.append(element)
+
 
     def generate_annotation(self, context: bpy.types.Context) -> Union[str, None]:
         if not ifcopenshell.util.element.get_pset(self.drawing, "EPset_Drawing", "HasAnnotation"):