EaseDriv: setting is_running to 0 should stop

ease.c

@@ -1140,8 +1140,13 @@ void EaseRunPar(void *object)
   assert(ead = EaseDrivCast(object));
 
   ParName("is_running");
+  ParAccess(usUser);
   ParInt(&ead->is_running, 0);
-
+  if (ParActionIs(PAR_SET) > 0) {
+    if (!ead->is_running) {
+      EaseHalt(ead);
+    }
+  }
 }
 /*----------------------------------------------------------------------------*/
 void EaseDrivPar(void *object, char *fmt, char *unit)