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translate: fix stutter-invariant flag on leading Xs

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Issue discovered by Mikuláš Klokočka and reported by František
Blahoudek.

* spot/twaalgos/translate.cc: Reset the stutter-invariant flag
when adding extra transitions for leading Xs.
* tests/core/stutter-tgba.test: New test case.
* NEWS: Mention the bug.
This commit is contained in:
Alexandre Duret-Lutz 2018-12-07 15:53:54 +01:00
parent 560c6f2d48
commit 77f3ba9478
3 changed files with 18 additions and 0 deletions
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4
spot/twaalgos/translate.cc
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@ -313,6 +313,10 @@ namespace spot
}
while (--leading_x);
aut->set_init_state(init);
// Adding initial edges is very likely to kill stutter
// invariance (and it certainly cannot fix it).
if (aut->prop_stutter_invariant().is_true())
aut->prop_stutter_invariant(trival::maybe());
}
}
else