Using the bigfile.py generation program from #17613 triggers the following traceback:
Traceback (most recent call last):
File "/usr/bin/idle", line 5, in <module>
main()
File "/usr/lib/python3.3/idlelib/PyShell.py", line 1431, in main
if flist.open(filename) is None:
File "/usr/lib/python3.3/idlelib/FileList.py", line 36, in open
edit = self.EditorWindow(self, filename, key)
File "/usr/lib/python3.3/idlelib/PyShell.py", line 113, in __init__
if self.io.filename: self.restore_file_breaks()
File "/usr/lib/python3.3/idlelib/PyShell.py", line 229, in restore_file_breaks
filename = self.io.filename
AttributeError: 'NoneType' object has no attribute 'filename'