Fixed isolation bug with FVar data -- avoid false match with a regular patch.
Fixed isolation bug with FVar data -- avoid false match with a regular patch.

anshuarya/OpenSubdiv,c64kernal/OpenSubdiv,xldeveloper/OpenSubdiv,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv,shengfuintel/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv,anshuarya/OpenSubdiv,nyotis/OpenSubdiv,xldeveloper/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,c64kernal/OpenSubdiv,poljere/OpenSubdiv,poljere/OpenSubdiv,c64kernal/OpenSubdiv,anshuarya/OpenSubdiv,lookup1980/OpenSubdiv,takahito-tejima/OpenSubdiv,poljere/OpenSubdiv,nyotis/OpenSubdiv