My problem was that whenever a dashboard was cloned, it was created a copy of it, but all filters in its gadgets were the original filters. But I wanted cloned dashboards with cloned filters in it, so all original stuff keeps untouched, when working with the cloned dashboards.
I've already found a solution, how to manage that. I always created a new filter, modified the UserPrefs of each Gadget and save it afterwards with saveLegacyPortletConfiguration(...).
I'm sorry, that doesn't make much sense. If you've got a portlet configuration, you've got some settings from the user. What do you mean "another filter"? If you need another filter, you set up the properties to ask the user for a second filter.
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