[TYPO3-mvc] Adding new constraints to existing constraints in widget query

[Torsten Schrade]

Hi list,

I have a custom widget that gets the original query with 
$this->objects->getQuery(), adds some constraints with 
$query->matching() and executes it. So far so good. But what if the 
original query already contained some constraints? Those would be 
overriden by my widget. Therefore I would like to append, not to 
replace my constraints to the original query. Code snippets and/or 
suggestions on how to achieve this would be very welcome. Thanks a lot 
and cheers,

Torsten