Make sure the degeneralization is idempotent (up to renaming of

states).

* src/tgbaalgos/tgbatba.cc: When degeneralizing to SBA, remove the
acceptance conditions that are common to all outgoing transitions
of this state.  This helps to make the degeneralization
idempotent.
* src/tgbatest/degenid.test: New test case.
* src/tgbatest/Makefile.am: Add it.

src/tgbatest/Makefile.am

@@ -92,6 +92,7 @@ TESTS = \
   mixprod.test \
   dupexp.test \
   degendet.test \
+  degenid.test \
   kv.test \
   reduccmp.test \
   reductgba.test \

src/tgbatest/degenid.test

@@ -0,0 +1,40 @@
+#!/bin/sh
+# Copyright (C) 2011 Laboratoire de Recherche et Développement
+# de l'Epita (LRDE).
+#
+# 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 2 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 Spot; see the file COPYING.  If not, write to the Free
+# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+. ./defs
+
+set -e
+
+# Make sure degeneralization is idempotent
+
+for f in 'FGa|GFb' 'GFa & GFb & GFc' 'GF(a->FGb)&GF(c->FGd)'; do
+  for opt in -DS -D; do
+    ../ltl2tgba $opt -b "$f" > autX.spot
+    ../ltl2tgba -X -kt autX.spot > base.size
+    cat base.size
+    for x in X XX XXX; do
+      ../ltl2tgba -X $opt -b aut$x.spot > autX$x.spot
+      ../ltl2tgba -X -kt autX$x.spot > new.size
+      cat new.size
+      cmp base.size new.size
+    done
+  done
+done