ltlsynt: use wdba-minimize=2 and ba-simul=0

* bin/ltlsynt.cc: Here.
* tests/core/ltlsynt.test: Add extra test case.
* NEWS: Mention ltlsynt -x and related defaults.

NEWS

@@ -21,6 +21,10 @@ New in spot 2.9.0.dev (not yet released)
   - ltlsynt learned --algo=ps to use the default conversion to
     deterministic parity automata (the same as ltl2tgba -DP'max odd').
 
+  - ltlsynt now has a -x option to fine-tune the translation.  See the
+    spot-x(7) man page for detail.  Unlike ltl2tgba, ltlsynt defaults
+    to simul=0,ba-simul=0,det-simul=0,tls-impl=1,wdba-minimize=2.
+
   Library:
 
   - product_xor() and product_xnor() are two new versions of the

bin/ltlsynt.cc

@@ -670,8 +670,10 @@ main(int argc, char **argv)
 {
   return protected_main(argv, [&] {
       extra_options.set("simul", 0);
+      extra_options.set("ba-simul", 0);
       extra_options.set("det-simul", 0);
       extra_options.set("tls-impl", 1);
+      extra_options.set("wdba-minimize", 2);
       const argp ap = { options, parse_opt, nullptr,
                         argp_program_doc, children, nullptr, nullptr };
       if (int err = argp_parse(&ap, argc, argv, ARGP_NO_HELP, nullptr, nullptr))

tests/core/ltlsynt.test

@@ -321,3 +321,9 @@ diff out exp
 
 ltlsynt -f '!XXF(p0 & (p0 M Gp0))' > out
 diff out exp
+
+f='Fp0 U XX((p0 & F!p1) | (!p0 & Gp1))'
+ltlsynt --verbose --algo=ps --outs=p1 --ins=p0 -f "$f" 2>err
+grep 'DPA has 14 states' err
+ltlsynt --verbose -x wdba-minimize=1 --algo=ps --outs=p1 --ins=p0 -f "$f" 2>err
+grep 'DPA has 12 states' err