Fluid: Another adjustment for Python pointers

Yet another update to ensure that pointer variables are always up to date, i.e. those referencing the memory allocated by Mantaflow. Outdated pointers usually show up through flickering in viewport.

source/blender/blenkernel/intern/fluid.c

@@ -1119,6 +1119,7 @@ static void ensure_obstaclefields(FluidDomainSettings *fds)
   if (fds->active_fields & FLUID_DOMAIN_ACTIVE_GUIDE) {
     manta_ensure_guiding(fds->fluid, fds->fmd);
   }
+  manta_update_pointers(fds->fluid, fds->fmd);
 }
 
 static void update_obstacleflags(FluidDomainSettings *fds,
@@ -2605,6 +2606,7 @@ static void ensure_flowsfields(FluidDomainSettings *fds)
        fds->particle_type & FLUID_DOMAIN_PARTICLE_TRACER)) {
     manta_liquid_ensure_sndparts(fds->fluid, fds->fmd);
   }
+  manta_update_pointers(fds->fluid, fds->fmd);
 }
 
 static void update_flowsflags(FluidDomainSettings *fds, Object **flowobjs, int numflowobj)
@@ -3627,11 +3629,7 @@ static int manta_step(
     manta_smoke_calc_transparency(fds, DEG_get_evaluated_view_layer(depsgraph));
   }
 
-  /* Ensure that fluid data is always up to date. */
-  manta_update_pointers(fds->fluid, fmd);
-
   BLI_mutex_unlock(&object_update_lock);
-
   return result;
 }
 
@@ -4080,6 +4078,9 @@ static void BKE_fluid_modifier_processDomain(FluidModifierData *fmd,
     }
   }
 
+  /* Ensure that fluid pointers are always up to date at the end of modifier processing. */
+  manta_update_pointers(fds->fluid, fmd);
+
   fds->flags &= ~FLUID_DOMAIN_FILE_LOAD;
   fmd->time = scene_framenr;
 }