Optimise the optimisation recipe. See #944.

src/ifcpatch/recipes/RecycleNonRootedElements.py

@@ -1,3 +1,6 @@
+from collections import deque
+import ifcopenshell.util.element
+
 class Patcher:
     def __init__(self, src, file, logger, args=None):
         self.src = src
@@ -6,15 +9,27 @@ class Patcher:
         self.args = args
 
     def patch(self):
-        import ifcopenshell.util.element
+        deleted = []
         hashes = {}
         for element in self.file:
             if element.is_a('IfcRoot'):
                 continue
             h = hash(tuple(element))
             if h in hashes:
-                for inverse in f.get_inverse(element):
+                for inverse in self.file.get_inverse(element):
                     ifcopenshell.util.element.replace_attribute(inverse, element, hashes[h])
-                self.file.remove(element)
+                deleted.append(element.id())
             else:
                 hashes[h] = element
+        deleted.sort()
+        deleted_q = deque(deleted)
+        new = ''
+        for line in self.file.wrapped_data.to_string().split('\n'):
+            try:
+                if int(line.split('=')[0][1:]) != deleted_q[0]:
+                    new += (line + '\n')
+                else:
+                    deleted_q.popleft()
+            except:
+                new += (line + '\n')
+        self.file = new