Form instances with MultipleChoiceField share choices

[cbrand@…]

If I create two instances of a form with a MultipleChoiceField, and then change the choices on one of them, the choices are also changed on the other :

In [2]: import django.newforms as forms

In [3]: class MyForm(forms.Form):
   ...:     x = forms.MultipleChoiceField()
   ...:     
   ...:     

In [4]: f = MyForm()

In [5]: f2 = MyForm()

In [6]: f2.as_p()
Out[6]: u'<p><label for="id_x">X:</label> <select multiple="multiple" name="x" id="id_x">\n</select></p>'

In [7]: f.fields['x'].choices = [('1','1')]

In [8]: f2.as_p()
Out[8]: u'<p><label for="id_x">X:</label> <select multiple="multiple" name="x" id="id_x">\n<option value="1">1</option>\n</select></p>'

Surely changing the choices in f should not affect f2 ?

[Malcolm Tredinnick]

I don't have time to test it right at the moment, but I'm pretty sure this will have been fixed with the deepcopy() additions to newforms on trunk. If somebody could verify that (try to repeat the problem with trunk), that would be great.

[Matt McClanahan]

Verified, fixed in trunk.