[petsc-dev] Attaching a near null space to an IS

[Jed Brown]

Matt introduced this concept, he says the IS is a better place to attach
things.

http://petsc.cs.iit.edu/petsc/petsc-dev/rev/2ad289ac99e0

I don't understand why the IS is better (because it's mostly immutable?).
I'm worried that putting it there is going to be fragile because the near
null space is not a property of an IS at all.
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