Hello, dear community.

Does anyone can help me with this question: I'd like to know, if a filter in a 
pipeline have already been applied/calculated. Maybe there are some observers 
exists (e.g. vtkSMPProgressObserver)? Or I have to dig into 
vtkDemandDrivenPipeline?

The overall task is to modify some GUI elements depending on a pipeline 
execution state...

Can anyone push me to a right direction please?
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