[issue989712] Support using Tk without a mainloop

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 837ac3abf0c5 by Andrew Svetlov in branch 'default':
Issue #989712: update the code to process tkinter messages in IDLE
http://hg.python.org/cpython/rev/837ac3abf0c5

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