[Interest] how to use QAction::changed() and doc missing

[Vincent]

Hello,

It seems that QAction::changed() is not documented (if I understand well
what does it do)

When clicking on the "changed()" links all across the following doc page,
we are pointed to the "What is this" property description:

http://qt-project.org/doc/qt-5.0/qtwidgets/qaction.html


What I would like to do is to connect a slot to a signal that would be
raised when the QAction is enabled/disabled. Do you know how to do that?

Thanks,

Cosmo
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