Fixed issues in the group filter.

The group filter was not dealing with extents properly. It
needed to properly ask for the whole extent from inputs (which
was done using an extent translator in the past) and it needed
to remove whole extent from the output (the default is to copy
from 1st input).

Change-Id: Ib44282f7f48aa60c7fad9fa6a5cceeb50e9b2e54

Filters/General/vtkMultiBlockDataGroupFilter.cxx

@@ -33,6 +33,37 @@ vtkMultiBlockDataGroupFilter::~vtkMultiBlockDataGroupFilter()
 {
 }
 
+//-----------------------------------------------------------------------------
+int vtkMultiBlockDataGroupFilter::RequestInformation(
+  vtkInformation *vtkNotUsed(request),
+  vtkInformationVector **vtkNotUsed(inputVector),
+  vtkInformationVector *outputVector)
+{
+  vtkInformation* info = outputVector->GetInformationObject(0);
+  info->Remove(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
+  return 1;
+}
+
+//-----------------------------------------------------------------------------
+int vtkMultiBlockDataGroupFilter::RequestUpdateExtent(
+  vtkInformation *vtkNotUsed(request),
+  vtkInformationVector **inputVector,
+  vtkInformationVector *vtkNotUsed(outputVector))
+{
+  int numInputs = inputVector[0]->GetNumberOfInformationObjects();
+  for (int i=0; i<numInputs; i++)
+    {
+    vtkInformation* inInfo = inputVector[0]->GetInformationObject(i);
+    if (inInfo->Has(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT()))
+      {
+      inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(),
+        inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT()),
+        6);
+      }
+    }
+  return 1;
+}
+
 //-----------------------------------------------------------------------------
 int vtkMultiBlockDataGroupFilter::RequestData(
   vtkInformation *vtkNotUsed(request),

Filters/General/vtkMultiBlockDataGroupFilter.h

@@ -48,6 +48,12 @@ protected:
   vtkMultiBlockDataGroupFilter();
   ~vtkMultiBlockDataGroupFilter();
 
+  virtual int RequestInformation(vtkInformation *,
+                  vtkInformationVector **,
+                  vtkInformationVector *);
+  virtual int RequestUpdateExtent(vtkInformation *,
+                  vtkInformationVector **,
+                  vtkInformationVector *);
   virtual int RequestData(vtkInformation *,
                   vtkInformationVector **,
                   vtkInformationVector *);