twa: get rid of intersecting_run()'s second argument

* spot/twa/twa.cc, spot/twa/twa.hh: Here.
* NEWS: Mention the backward incompatibility.

NEWS

@@ -135,6 +135,15 @@ New in spot 2.7.5.dev (not yet released)
     properties.  This can be altered with the SPOT_PR_CHECK
     environment variable.
 
+  Backward incompatibilities:
+
+  - The virtual function twa::intersecting_run() no longuer takes a
+    second "from_other" Boolean argument.  This is a backward
+    incompatibility only for code that overrides this function in a
+    subclass.  For backward compatibility with programs that simply
+    call this function with two argument, a non-virtual version of the
+    function has been introduced and marked as deprecated.
+
   Bugs fixed:
 
   - The gf_guarantee_to_ba() is relying on an inplace algorithm that

spot/twa/twa.cc

@@ -158,7 +158,7 @@ namespace spot
   }
 
   twa_run_ptr
-  twa::intersecting_run(const_twa_ptr other, bool from_other) const
+  twa::intersecting_run(const_twa_ptr other) const
   {
     auto self = shared_from_this();
     if (acc().uses_fin_acceptance() || other->acc().uses_fin_acceptance())
@@ -168,14 +168,14 @@ namespace spot
         auto run = generic_accepting_run(product(g1, g2));
         if (!run)
           return nullptr;
-        return run->reduce()->project(from_other ? g2 : g1);
+        return run->reduce()->project(g1);
       }
     self = remove_fin_maybe(self); // remove alternation, not Fin
     other = remove_fin_maybe(other);
     auto run = otf_product(self, other)->accepting_run();
     if (!run)
       return nullptr;
-    return run->reduce()->project(from_other ? other : self);
+    return run->reduce()->project(self);
   }
 
   twa_word_ptr

spot/twa/twa.hh

@@ -872,18 +872,42 @@ namespace spot
     /// \brief Return an accepting run recognizing a word accepted by
     /// two automata.
     ///
-    /// If \a from_other is true, the returned run will be over the
+    /// The run returned is a run from automaton this.
-    /// \a other automaton.  Otherwise, the run will be over this
-    /// automaton.  (This argument will be deprecated soon, do not
-    /// use it.)
     ///
     /// Return nullptr if no accepting run were found.
     ///
     /// An emptiness check is performed on a product computed
     /// on-the-fly, unless some of the operands use Fin-acceptance: in
     /// this case an explicit product is performed.
-    virtual twa_run_ptr intersecting_run(const_twa_ptr other,
+    virtual twa_run_ptr intersecting_run(const_twa_ptr other) const;
-                                         bool from_other = false) const;
+
+    /// \brief Return an accepting run recognizing a word accepted by
+    /// two automata.
+    ///
+    /// If \a from_other is true, the returned run will be over the
+    /// \a other automaton.  Otherwise, the run will be over this
+    /// automaton.
+    ///
+    /// This form is deprecated.  Replace a->interesecting_run(b, true)
+    /// by b->intersecting_run(a).
+    ///
+    /// Return nullptr if no accepting run were found.
+    ///
+    /// An emptiness check is performed on a product computed
+    /// on-the-fly, unless some of the operands use Fin-acceptance: in
+    /// this case an explicit product is performed.
+    ///
+    /// This function was deprecated in Spot 2.8.
+    SPOT_DEPRECATED("replace a->intersecting_run(b, true) "
+                    "by b->intersecting_run(a).")
+    twa_run_ptr intersecting_run(const_twa_ptr other,
+                                 bool from_other) const
+    {
+      if (from_other)
+        return other->intersecting_run(shared_from_this());
+      else
+        return this->intersecting_run(other);
+    }
 
     /// \brief Return a word accepted by two automata.
     ///