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twa: guard against highlighting of non-existing edges and states

Alexandre Duret-Lutz requested to merge adl/556 into next

For issue #556 (closed), reported by Dávid Smolka. Not sure if this is a complete fix yet, but that's at least part of the issue.

  • spot/twa/ (defrag_states): Skip those unexisting edges and states while remaping highlight-states and highlight-edges.
  • spot/parseaut/parseaut.yy: Likewise for dropped edges.
  • tests/python/ Augment test case.

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