Load state fixes

docs: paraview-docs!8 (merged)

State file: state.pvsm

Old dialog:

New dialog:

Old trace:

# load state
LoadState('/tmp/state.pvsm', LoadStateDataFileOptions='Choose File Names',
    DataDirectory='/tmp',
    canex2FileName=['/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/ExternalData/Testing/Data/can.ex2'],
    canex2FilePattern='',
    canex2FilePrefix='',
    canex2XMLFileName='',
    customnameFileName=['/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/ExternalData/Testing/Data/can.ex2'],
    customnameFilePattern='',
    customnameFilePrefix='',
    customnameXMLFileName='')

New trace:

# load state using specified data files
LoadState('/tmp/state.pvsm',
    filenames=[\
        {
            'name' : 'can.ex2',
            'id' : '11445',
            'FileName' : '/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/ExternalData/Testing/Data/can.ex2',
        },
        {
            'name' : 'custom-name',
            'id' : '11792',
            'FileName' : '/home/utkarsh/Kitware/ParaView3/ParaViewBin-Qt5/ExternalData/Testing/Data/can.ex2',
        },
    ])

Old result (all pipeline browser names are changed):

New result (only names that were directly file-based are changed, leaving modified ones unchanged):

Fixes #17995 (closed)