Minimal code example:


from Tkinter import Tk
from tkSimpleDialog import askstring

def close_handler():
    askstring('', '')
    root.destroy()

root = Tk()
root.protocol('WM_DELETE_WINDOW', close_handler)
root.mainloop()


Closing the main window brings up the askstring dialog. *When run on OS X* (Yosemite, default Python and Tkinter version), each key press on the dialog's input field is doubled (thus when typing "abc" what will actually be entered is "aabbcc"). On Linux (Python + Tkinter 2.7.8) the problem does not occur. When the dialog is invoked from outside the close handler, the problem does not occur.

This bug is causing a downstream issue in the "quicksafe" system (https://github.com/p-e-w/quicksafe/issues/2).