Fix bug where removing an opening might remove an element twice

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