SingleCheckBoxWidget in HIDDEN_MODE always yields true

[Wolfgang Schnerring]

If a SingleCheckBoxWidget belongs to a BooleanField whose value is False and is rendered in HIDDEN_MODE, the field's value is set to True when the form is submitted -- which is clearly not the desired result.

For the SingleCheckBoxWidget this can be fixed with the attached patch, but then other tests in checkbox.txt break, relating to the (Multi)CheckBoxWidget, and I don't understand enough about that to fix those. Could someone more familiar with the code integrate the patch?

[Stephan Richter (srichter)]

Wolfgang, can you provide a test showing the issue in the first place? Then I can have a better look at the problem and the proposed solution.