Garth is getting a segv when he uses -pc_gamg_asm_use_agg and an overlap of

This seems like a pretty hard thing to do right and I would not be
surprised if it was not done with complete generality. MatGetSubMatrix is
find to get any submatrix but enlarging a remote subdomain seems very

Should I perhaps check for overlap in GAMG and give an error? Maybe it
would be better to have ASM do this.  Maybe I could make ASM have a flag
am-i-nested and not allow overlap if not?


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