GitLab

dified:   source/mom/tracer.F

Before the correction, check_diff failed when fneg = 0 because checking
neighbouring cells is triggered by negative fluxes.  Now the checks are saved
and not re-evaluated after modifying fluxes.

failure can happen when the tracer in one strip is negative on average

I had forgotten to correct diff_fe(imt,...) and diff_fe(1,...) when
diff_fe(2,...) or diff_de(imtm1,...) were changed