[Zope-CMF] ActionProviderBase fix for migration problem

[Christian Heimes]

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Hello!

Some people reported migration problems for migration from plone using
an older version of CMF to plone 2 with CMF 1.4.2. The flag 'visible'
isn't an integer or isn't convertable to an int with int() in some
cases. This code sometimes breaks when called form
TypesTool:_convertActions()

ActionProviderBase:addAction()
~    [...]
~        new_action = ActionInformation( id=str(id)
~                                      , title=str(name)
~                                      , action=a_expr
~                                      , condition=c_expr
~                                      , permissions=permission
~                                      , category=str(category)
~                                      , visible=int(visible)
~                                      )

I would like to chance 'visible=int(visible)' to 'not not visible'. The
bool() method would be nicer but it's not available in python 2.1

Christian
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