ENH: Fixed BUG #4133. Added support to select blocks of a multiblock dataset.
Use the shortcut "B" to enter the block-selection mode and then draw the rubber band or simply click to select the block at the cursor. Added a new ContentType (BLOCKS) to vtkSelection. In this mode, the vtkSelectionList is a vtkUnsignedIntArray with the composite index for the selected blocks.
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