Resolve issue: Infinite loop at last time step in tddft-maxwell tutorial
Description
There was a bug when propagating more than one system and the propagation time was not commensurate with the time steps.
News snippet
Fix error regarding time propagation with incommensurate propagation time.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Contributes to #1226
Edited by Martin Lueders