[issue12723] tkSimpleDialog.askstring shouldn't allow empty string input

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

But what if the empty string is valid input?  This change would be backward incompatible.

I think this should instead be a feature request for exposing _QueryDialog so that you can subclass it and provide your own getresult function.

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nosy: +r.david.murray

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<http://bugs.python.org/issue12723>
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