Moved the invalidate handler to it's own method so that the remove function will properly remove it.

Author: claritymaker

prompt_toolkit/application/application.py

@@ -458,7 +458,7 @@ def _update_invalidate_events(self):
  # Remove all the original event handlers. (Components can be removed
  # from the UI.)
  for ev in self._invalidate_events:
- ev -= self.invalidate
+ ev -= self._invalidate_handler
 
  # Gather all new events.
  # (All controls are able to invalidate themselves.)
@@ -469,12 +469,14 @@ def gather_events():
 
  self._invalidate_events = list(gather_events())
 
- # Attach invalidate event handler.
- def invalidate(sender):
- self.invalidate()
-
  for ev in self._invalidate_events:
- ev += invalidate
+ ev += self._invalidate_handler
+
+ def _invalidate_handler(self, sender):
+ """
+ Handler to allow invalidate to be called with the correct signature.
+ """
+ self.invalidate()
 
  def _on_resize(self):
  """
@@ -623,7 +625,7 @@ def flush_input():
  # invalidate should not trigger a repaint in
  # terminated applications.)
  for ev in self._invalidate_events:
- ev -= self.invalidate
+ ev -= self._invalidate_handler
  self._invalidate_events = []
 
  # Wait for CPR responses.