WIP implement deep removal of geometry. See #1222. See #1228.

src/ifcblenderexport/blenderbim/bim/module/geometry/remove_representation.py

@@ -6,4 +6,17 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        self.file.remove(self.settings["representation"])
+        styles = []
+        for subelement in self.file.traverse(self.settings["representation"]):
+            if subelement.is_a("IfcRepresentationItem") and subelement.StyledByItem:
+                styles.append(subelement)
+        for style in styles:
+            self.remove_deep(style)
+        self.remove_deep(self.settings["representation"])
+
+    def remove_deep(self, element):
+        subgraph = list(self.file.traverse(element))
+        subgraph_set = set(subgraph)
+        for ref in subgraph[::-1]:
+            if ref.id() and len(set(self.file.get_inverse(ref)) - subgraph_set) == 0:
+                self.file.remove(ref)