I'm using a GhostingFunctor in order to define the sparsity pattern
required on a contact surface. However, I now need to handle the "finite
sliding" case where we update the master/slave pairs (and hence also the
sparsity pattern) within each nonlinear iteration based on the current
solution.

The approach I'd like to use within each Newton iteration is:
1. Move the mesh nodes based on the current solution and update the
master/slave pairs
2. Call mesh_reinit for each GhostingFunctor that has been attached to the
system
3. Update the matrix sparsity pattern
4. Perform the Jacobian/residual assembly using the new sparsity pattern

I'm not clear on what the best way to deal with step 3 is, so I'd be
interested in any suggestions on this? Are there any existing functions
that would do what I need or would I need to write new code for this?

Thanks,
David
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