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Don't setup a JacVec if concrete_jac==true, and use non SciMLOperator W_prototype #2491

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I'm not sure if this is a good idea yet, but I want to run it past CI.

@oscardssmith oscardssmith changed the title Os/no jacvec if concrete jac Don't setup a JacVec if concrete=jac==true, and use non SciMLOperator W_prototype Oct 10, 2024
@oscardssmith oscardssmith changed the title Don't setup a JacVec if concrete=jac==true, and use non SciMLOperator W_prototype Don't setup a JacVec if concrete_jac==true, and use non SciMLOperator W_prototype Oct 10, 2024
jacvec = JacVec(__f, copy(u), p, t;
autodiff = alg_autodiff(alg), tag = OrdinaryDiffEqTag())
WOperator{IIP}(f.mass_matrix, dt, J, u, jacvec)
WOperator{IIP}(f.mass_matrix, dt, J, u, nothing)
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how would this work?

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by using the Jacobian. if you scroll up to the w_operator ops, they all check for whether ja cacvec exists

@@ -391,7 +391,7 @@ function do_newJW(integrator, alg, nlsolver, repeat_step)::NTuple{2, Bool}
# TODO: add `isJcurrent` support for Rosenbrock solvers
if !isnewton(nlsolver)
isfreshJ = !(integrator.alg isa CompositeAlgorithm) &&
(integrator.iter > 1 && errorfail && !integrator.u_modified)
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how would this not be an issue to drop?

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if iter<=1 we already returned on the first line (I changed that a few months ago)

@ChrisRackauckas
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Rebase?

@oscardssmith
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rebased now that CI ismore stable

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