Change parent of filter models

qutebrowser/completion/completer.py

@@ -165,7 +165,7 @@ class Completer(QObject):
         Return:
             A completion filter model.
         """
-        filtermodel = CompletionFilterModel(source=model, parent=self.parent())
+        filtermodel = CompletionFilterModel(source=model, parent=self)
         return filtermodel
 
     def _filter_cmdline_parts(self, parts, cursor_part):

qutebrowser/completion/models/base.py

@@ -40,10 +40,6 @@ class BaseCompletionModel(QStandardItemModel):
     Used for showing completions later in the CompletionView. Supports setting
     marks and adding new categories/items easily.
 
-    Attributes:
-        dumb_sort:  the sorting that will be used by the wrapping
-                    CompletionFilterModel
-
     Class Attributes:
         COLUMN_WIDTHS: The width percentages of the columns used in the
                         completion view.