use min_post_force() method to hook fix halt into minimization

src/fix_halt.cpp

@@ -119,6 +119,7 @@ int FixHalt::setmask()
   int mask = 0;
   mask |= END_OF_STEP;
   mask |= POST_RUN;
+  mask |= MIN_POST_FORCE;
   return mask;
 }
 
@@ -138,14 +139,17 @@ void FixHalt::init()
   // settings used by TLIMIT
 
   nextstep = (update->ntimestep/nevery)*nevery + nevery;
+  thisstep = -1;
   tratio = 0.5;
 }
 
 /* ---------------------------------------------------------------------- */
 
-void FixHalt::min_step(double, double *)
+void FixHalt::min_post_force(int /* vflag */)
 {
+  if (update->ntimestep == thisstep) return;
   if ((update->ntimestep % nevery) == 0) end_of_step();
+  thisstep = update->ntimestep;
 }
 
 /* ---------------------------------------------------------------------- */

src/fix_halt.h

@@ -32,12 +32,12 @@ class FixHalt : public Fix {
   int setmask();
   void init();
   void end_of_step();
-  void min_step(double, double *);
+  void min_post_force(int);
   void post_run();
 
  private:
   int attribute,operation,eflag,msgflag,ivar;
-  bigint nextstep;
+  bigint nextstep,thisstep;
   double value,tratio;
   char *idvar;