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MultipleSelect2HiddenInput extends forms.TextInput that widget gets his _has_changed from Widget class: https://github.com/django/django/blob/stable/1.5.x/django/forms/widgets.py#L211.
That function is not good for many value widgets because for initial values: None, [] it returns True...
You have to use _has_changed from: https://github.com/django/django/blob/stable/1.5.x/django/forms/widgets.py#L642.
This problem occurred when I try use that field in formset. Formset validates only changed forms, so now it will validate all forms in formset even extra ones.
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