Regenerate connected walls when recalculating a slab

When Shift+G is pressed on a LAYER3 element, any LAYER2 walls
connected via IfcRelConnectsElements(TOP) are now re-clipped
to the slab's updated geometry after recalculate_slab runs.

Generated with the assistance of an AI coding tool.

src/bonsai/bonsai/bim/module/model/workspace.py

@@ -1309,6 +1309,9 @@ class Hotkey(bpy.types.Operator, tool.Ifc.Operator):
                 bpy.ops.bim.recalculate_wall()
         elif self.active_material_usage == "LAYER3":
             bpy.ops.bim.recalculate_slab()
+            wall_objs = tool.Model.get_connected_wall_objs(element)
+            if wall_objs:
+                core.regenerate_wall_to_underside(tool.Ifc, tool.Geometry, tool.Model, wall_objs)
         elif tool.System.get_ports(element):
             bpy.ops.bim.regenerate_distribution_element()
         elif self.active_material_usage == "PROFILE":

src/bonsai/bonsai/core/tool.py

@@ -669,6 +669,7 @@ class Model:
     def generate_occurrence_name(cls, element_type, ifc_class): pass
     def get_extrusion(cls, representation): pass
     def get_connected_slab_objs(cls, wall): pass
+    def get_connected_wall_objs(cls, slab): pass
     def get_manual_booleans(cls, element): pass
     def get_material_layer_parameters(cls, element): pass
     def get_slab_clipping_bmesh(cls, obj): pass

src/bonsai/bonsai/tool/model.py

@@ -822,6 +822,17 @@ class Model(bonsai.core.tool.Model):
                     result.append(slab_obj)
         return result
 
+    @classmethod
+    def get_connected_wall_objs(cls, slab: ifcopenshell.entity_instance) -> list[bpy.types.Object]:
+        """Return Blender objects for LAYER2 walls connected to slab via IfcRelConnectsElements(TOP)."""
+        result = []
+        for rel in slab.ConnectedTo:
+            if rel.is_a("IfcRelConnectsElements") and rel.Description == "TOP":
+                wall_obj = tool.Ifc.get_object(rel.RelatedElement)
+                if wall_obj:
+                    result.append(wall_obj)
+        return result
+
     @classmethod
     def remove_wall_to_underside_booleans(cls, wall: ifcopenshell.entity_instance) -> None:
         """Remove all IfcBooleanResult items previously added by extend_walls_to_underside."""