Issue #25507: Merge from 3.5 with ttk replacing colorchooser.

IDLE no longer runs buggy code because of its tkinter imports.
Users must include the same imports required to run directly in Python.

diff --cc Lib/idlelib/run.py
index 10ede99e33742b83359da4d6cb27f18ba7eb32c8,28ce4200a92a534919ea5881fc1c8b5f510d81b1..c7ee0b3e458bbae7c1db9134f5b7a687a1a685f3
--- 1/Lib/idlelib/run.py
--- 2/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@@ -19,6 -19,12 +19,12 @@@ from idlelib import iomen
  
  import __main__
  
 -            'colorchooser'):
+ for mod in ('simpledialog', 'messagebox', 'font',
+             'dialog', 'filedialog', 'commondialog',
++            'ttk'):
+     delattr(tkinter, mod)
+     del sys.modules['tkinter.' + mod]
+ 
  LOCALHOST = '127.0.0.1'
  
  import warnings