Let pqSaveScreenshotReaction works with custom widget.
So far the reaction could only be used if a pqTabbedMultiViewWidget was used. Fix the code so a paraview based application can use the reaction with another kind of QWidget.
So far the reaction could only be used if a pqTabbedMultiViewWidget was used. Fix the code so a paraview based application can use the reaction with another kind of QWidget.