Merge pull request #918 from SebastianM-C/smc/remake

fix: make sure remake(::SCCNonlinearProblem) doesn't drop prob.f.sys

Author: ChrisRackauckas

src/remake.jl

@@ -833,6 +833,9 @@ function remake(prob::SCCNonlinearProblem; u0 = missing, p = missing, probs = mi
     if explicitfuns! === missing
         explicitfuns! = prob.explictfuns!
     end
+    if sys === missing
+        sys = prob.f.sys
+    end
     offset = 0
     if u0 !== missing || p !== missing && parameters_alias
         probs = map(probs) do subprob

test/downstream/modelingtoolkit_remake.jl

@@ -324,6 +324,7 @@ end
     @test sccprob2.probs[1].u0 ≈ 2ones(2)
     @test sccprob2.probs[2].u0 ≈ 2ones(1)
     @test sccprob2.explicitfuns! !== missing
+    @test sccprob2.f.sys !== missing
 
     sccprob3 = remake(sccprob; p = [σ => 2.0])
     @test sccprob3.p === sccprob3.probs[1].p