Fix bug where removing an opening might remove an element twice

src/ifcopenshell-python/ifcopenshell/api/void/remove_opening.py

@@ -9,15 +9,8 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        to_remove = [] # See bug #1224
-        for rel in self.file.by_type("IfcRelVoidsElement"):
-            if rel.RelatedOpeningElement == self.settings["opening"]:
-                to_remove.append(rel)
-                break
-        for rel in self.file.by_type("IfcRelFillsElement"):
-            if rel.RelatingOpeningElement == self.settings["opening"]:
-                to_remove.append(rel)
-                break
+        for rel in self.settings["opening"].VoidsElements:
+            self.file.remove(rel)
+        for rel in self.settings["opening"].HasFillings:
+            self.file.remove(rel)
         ifcopenshell.api.run("root.remove_product", self.file, product=self.settings["opening"])
-        for element in to_remove:
-            self.file.remove(element)

src/ifcopenshell-python/test/api/void/test_remove_opening.py

@@ -0,0 +1,30 @@
+import test.bootstrap
+import ifcopenshell.api
+
+class TestRemoveOpening(test.bootstrap.IFC4):
+    def test_removing_a_simple_opening(self):
+        opening = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcOpeningElement")
+        ifcopenshell.api.run("void.remove_opening", self.file, opening=opening)
+        assert len(list(self.file)) == 0
+
+    def test_removing_an_opening_voiding_a_wall(self):
+        wall = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
+        opening = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcOpeningElement")
+        ifcopenshell.api.run("void.add_opening", self.file, opening=opening, element=wall)
+        ifcopenshell.api.run("void.remove_opening", self.file, opening=opening)
+        assert len(self.file.by_type("IfcOpeningElement")) == 0
+        assert len(self.file.by_type("IfcRelVoidsElement")) == 0
+        assert wall
+
+    def test_removing_an_opening_voiding_a_wall_with_a_filling(self):
+        wall = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
+        opening = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcOpeningElement")
+        door = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcDoor")
+        ifcopenshell.api.run("void.add_opening", self.file, opening=opening, element=wall)
+        ifcopenshell.api.run("void.add_filling", self.file, opening=opening, element=door)
+        ifcopenshell.api.run("void.remove_opening", self.file, opening=opening)
+        assert len(self.file.by_type("IfcOpeningElement")) == 0
+        assert len(self.file.by_type("IfcRelVoidsElement")) == 0
+        assert len(self.file.by_type("IfcRelFillsElement")) == 0
+        assert wall
+        assert door