Heavily rewrite and optimize the determinization

* NEWS: document the rewrite
* spot/twaalgos/determinize.cc: lots of code optimizations
* tests/core/safra.test, tests/python/highlighting.ipynb,
  tests/python/simstate.py: Update tests

NEWS

@@ -132,6 +132,11 @@ New in spot 2.4.1.dev (not yet released)
     https://spot.lrde.epita.fr/ipynb/stutter-inv-states.html for
     examples.
 
+  - Determinization has been heavily rewritten and optimized. The algorithm has
+    (almost) not changed, but it runs muuuch faster now. It also features an
+    optimization for stutter-invariant automata that may produce slightly
+    smaller automata.
+
   Deprecation notices:
 
   (These functions still work but compilers emit warnings.)

tests/core/safra.test

@@ -52,15 +52,15 @@ properties: trans-labels explicit-labels trans-acc deterministic
 State: 0
 [0] 1
 State: 1
-[0] 2 {1}
-[!0&1] 3
+[!0&1] 2
+[0] 3 {1}
 State: 2
-[0] 1
-[!0&1] 3
-State: 3
 [0&!1] 0
-[0&1] 2
-[!0&1] 3
+[!0&1] 2
+[0&1] 3
+State: 3
+[0] 1
+[!0&1] 2
 --END--
 EOF
 
@@ -98,19 +98,19 @@ State: 0
 [0] 1
 State: 1
 [0&!1] 1
-[0&1] 2
-[!0&1] 3 {1}
+[!0&1] 2 {1}
+[0&1] 3
 State: 2
+[0&!1] 0
+[!0&1] 2 {1}
+[0&1] 3
+State: 3
 [0&1] 1 {1}
-[!0&1] 3 {1}
+[!0&1] 2 {1}
 [0&!1] 4
-State: 3
-[0&!1] 0
-[0&1] 2
-[!0&1] 3 {1}
 State: 4
 [0] 1 {1}
-[!0&1] 3 {1}
+[!0&1] 2 {1}
 --END--
 EOF
 

tests/python/simstate.py

@@ -76,19 +76,19 @@ properties: trans-labels explicit-labels trans-acc complete
 properties: deterministic stutter-invariant
 --BODY--
 State: 0 "{₀[0]₀}"
-[0&!1] 0 {1}
 [!0&!1] 0
 [!0&1] 0
+[0&!1] 0 {1}
 [0&1] 1 {3}
 State: 1 "{₀[0]{₂[2]₂}₀}{₁[1]₁}"
-[0&!1] 0 {1}
 [!0&!1] 0 {2}
 [!0&1] 2
+[0&!1] 0 {1}
 [0&1] 1 {3}
 State: 2 "{₀[0]₀}{₁[1]₁}"
-[0&!1] 0 {1}
 [!0&!1] 0 {2}
 [!0&1] 2
+[0&!1] 0 {1}
 [0&1] 1 {3}
 --END--"""
 
@@ -118,53 +118,53 @@ Acceptance: 4 Fin(0) & (Inf(1) | (Fin(2) & Inf(3)))
 properties: trans-labels explicit-labels trans-acc deterministic
 --BODY--
 State: 0 "{₀[0#0,0#1]₀}"
+[!0&1] 1
 [0&!1] 0
-[0&1] 1
-[!0&1] 2
-State: 1 "{₀[0#0,0#1] [1#1]₀}"
-[0&!1] 3
+[0&1] 2
+State: 1 "{₀[1#1]₀}"
+[!0&1] 0
+[0&!1] 3 {1}
 [0&1] 4
-[!0&1] 1
-State: 2 "{₀[1#1]₀}"
-[0&!1] 5 {1}
-[0&1] 3
+State: 2 "{₀[0#0,0#1] [1#1]₀}"
+[!0&1] 2
+[0&!1] 4
+[0&1] 5
+State: 3 "{₀[1#0]₀}"
 [!0&1] 0
-State: 3 "{₀[0#0,0#1]{₁[1#0]₁}₀}"
 [0&!1] 3
 [0&1] 6
+State: 4 "{₀[0#0,0#1]{₁[1#0]₁}₀}"
 [!0&1] 7
-State: 4 "{₀[0#0,0#1] [1#1]{₁[1#0]₁}₀}"
-[0&!1] 3
-[0&1] 6
+[0&!1] 4
+[0&1] 8
+State: 5 "{₀[0#0,0#1] [1#1]{₁[1#0]₁}₀}"
 [!0&1] 7
-State: 5 "{₀[1#0]₀}"
-[0&!1] 5
+[0&!1] 4
 [0&1] 8
-[!0&1] 0
-State: 6 "{₀[1#1]{₁[0#0,0#1] [1#0]₁}₀}"
-[0&!1] 8 {1}
-[0&1] 9 {1}
-[!0&1] 1 {1}
+State: 6 "{₀[0#0,0#1] [1#0]₀}"
+[!0&1] 2
+[0&!1] 6
+[0&1] 9
 State: 7 "{₀[1#1]{₁[0#0,0#1]₁}₀}"
-[0&!1] 8 {1}
-[0&1] 9 {1}
 [!0&1] 10
-State: 8 "{₀[0#0,0#1] [1#0]₀}"
-[0&!1] 8
-[0&1] 9
-[!0&1] 1
+[0&!1] 6 {1}
+[0&1] 9 {1}
+State: 8 "{₀[1#1]{₁[0#0,0#1] [1#0]₁}₀}"
+[!0&1] 2 {1}
+[0&!1] 6 {1}
+[0&1] 9 {1}
 State: 9 "{₀[0#0,0#1] [1#1] [1#0]₀}"
-[0&!1] 3
-[0&1] 4
-[!0&1] 1
+[!0&1] 2
+[0&!1] 4
+[0&1] 5
 State: 10 "{₀[0#0,0#1]{₁[1#1]₁}₀}"
-[0&!1] 3 {3}
-[0&1] 11
 [!0&1] 7
+[0&!1] 4 {3}
+[0&1] 11
 State: 11 "{₀[1#1]{₁[0#0,0#1]{₂[1#0]₂}₁}₀}"
-[0&!1] 8 {1}
+[!0&1] 2 {1}
+[0&!1] 6 {1}
 [0&1] 9 {1}
-[!0&1] 1 {1}
 --END--"""
 
 a = spot.translate('!Gp0 xor FG((p0 W Gp1) M p1)')