Add check for hydro in cell_can_split_self_gravity_task (and pairs)

src/cell.h

@@ -941,7 +941,8 @@ __attribute__((always_inline)) INLINE static int cell_can_split_pair_stars_task(
   /* Note that since tasks are create after a rebuild no need to take */
   /* into account any part motion (i.e. dx_max == 0 here) */
   return c->split &&
-         (space_stretch * kernel_gamma * c->stars.h_max < 0.5f * c->dmin);
+    (space_stretch * kernel_gamma * c->stars.h_max < 0.5f * c->dmin) &&
+    (space_stretch * kernel_gamma * c->hydro.h_max < 0.5f * c->dmin);
 }
 
 /**
@@ -959,7 +960,8 @@ __attribute__((always_inline)) INLINE static int cell_can_split_self_stars_task(
   /* Note: No need for more checks here as all the sub-pairs and sub-self */
   /* tasks will be created. So no need to check for h_max */
   return c->split &&
-         (space_stretch * kernel_gamma * c->stars.h_max < 0.5f * c->dmin);
+    (space_stretch * kernel_gamma * c->stars.h_max < 0.5f * c->dmin) &&
+    (space_stretch * kernel_gamma * c->hydro.h_max < 0.5f * c->dmin);
 }
 
 /**