fix streett_to_generalized_buchi

Fixes #316.

* spot/twaalgos/totgba.cc: Fix confusing definition of scc_inf_wo_fin.
* tests/python/streett_totgba2.py: New test case.
* tests/Makefile.am: Add it.
* NEWS: Mention the bug.

tests/python/streett_totgba2.py

@@ -0,0 +1,70 @@
+#!/usr/bin/python3
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2018 Laboratoire de Recherche et Développement de
+# l'EPITA.
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Spot is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import spot
+
+# Issue 316
+a = spot.automaton("""
+HOA: v1
+States: 8
+Start: 0
+AP: 3 "b" "a" "c"
+Acceptance: 5 (Fin(0) | Inf(1)) & (Fin(2) | Inf(3)) & Inf(4)
+properties: trans-labels explicit-labels state-acc
+--BODY--
+State: 0
+[!0&!2] 1
+[0&!2] 2
+[2] 3
+State: 1
+[0&2] 4
+[0&1&2] 5
+State: 2
+[!0&!2] 1
+[!0&2] 3
+State: 3
+[!0&!2] 1
+[!0&2] 3
+[0&2] 4
+[0&1&2] 5
+State: 4
+[2] 4
+[0&1&2] 5
+[!0&!2] 6
+State: 5 {4}
+[1&2] 5
+[!0&1&!2] 7
+State: 6
+[0&2] 4
+[0&1&2] 5
+State: 7 {1 3 4}
+[0&1&2] 5
+--END--
+""")
+
+tgba = spot.streett_to_generalized_buchi(a)
+assert tgba.acc().is_generalized_buchi()
+ba = spot.simplify_acceptance(a)
+assert ba.acc().is_buchi()
+
+nba = spot.dualize(ba.postprocess('generic', 'deterministic'))
+ntgba = spot.dualize(tgba.postprocess('generic', 'deterministic'))
+assert not ba.intersects(ntgba)
+assert not tgba.intersects(nba)