"Extract Subset" filter will remove boundary faces in 3D view if multiple HDF grids are read in via XDMF

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

A Xdmf file with at least two rectangular grids is read in (see attached example). If the grids have a 3DSMesh topology and rely on HDF for the X,Y,Z data, the "Extract Subset" filter will produce a malformed image of the clipped grid in which one (or more, depending on the filter settings) of the six faces is missing. The same grid, when implemented as 3dCoRectMesh topology without HDF, does not show this behavior. The problem also disappears as soon as one of the two grids is removed/commented out in the Xdmf source file.

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