[Paraview] RequestData gets called twice when in parallel

[Paul Edwards]

Hi,

Filters have their RequestData called twice when using a parallel server.
 This happens when the filter is first added - subsequent "Apply"s only
called it once.

To reproduce:
First run a parallel server, attach a debugger and set a breakpoint in
"vtkArrayCalculator::RequestData"
Create a Box source
Use calculator to add an array, e.g. "coordsX"
Click Apply [ RequestData gets called twice ]
Update arrat , e.g. "coordsX + 0"
Click Apply [ RequestData only gets called once ]

I've added a bug report - http://www.paraview.org/Bug/view.php?id=12546

Regards,
Paul
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