* src/tgba/tgbaexplicit.cc, src/tgba/tgbaexplicit.hh

(tgba_explicit::merge_transitions): New method.
* src/tgbaalgos/ltl2tgba_fm.cc (ltl_to_tgba_fm): Factorize all
variables (not just Next and A) when computing prime implicants,
and then call merge_transitions().

src/tgba/tgbaexplicit.hh

@@ -64,6 +64,7 @@ namespace spot
     /// This assumes that all acceptance conditions in \a f are known from dict.
     void add_acceptance_conditions(transition* t, bdd f);
     void complement_all_acceptance_conditions();
+    void merge_transitions();
 
     // tgba interface
     virtual ~tgba_explicit();