You can take a snapshot of the configuration of your Plone site in the
portal_setup tool before running a GenericSetup product. Then if you
want to "uninstall" it, you can revert to the previous snapshot.
If you are installing a GenericSetup using Product with
Quickinstaller, then the normal install/uninstall methods in
Extentions/Install.py are still called and the product can still
uninstall itself as normal.
Note that regardless of the method (GenericSetup or Quickinstaller)
uninstall isn't always a guarantee. Consider a 'installer' that
changes the Title of your Plone Site for example. Well, if you had set
this to something else previously, should the uninstaller attempt to
remember the previous setting so it can rever to it, revert to the
default settings, or leave that property alone?
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