add function for rotating linked list so at item is last.

source/blender/blenlib/BLI_listbase.h

@@ -74,7 +74,8 @@ void BLI_freelinkN(struct ListBase *listbase, void *vlink);
 void BLI_movelisttolist(struct ListBase *dst, struct ListBase *src);
 void BLI_duplicatelist(struct ListBase *dst, const struct ListBase *src);
 void BLI_reverselist(struct ListBase *lb);
-void BLI_rotatelist(struct ListBase *lb, void *vlink);
+void BLI_rotatelist_first(struct ListBase *lb, void *vlink);
+void BLI_rotatelist_last(struct ListBase *lb, void *vlink);
 
 /* create a generic list node containing link to provided data */
 struct LinkData *BLI_genericNodeN(void *data);

source/blender/blenlib/intern/listbase.c

@@ -581,19 +581,34 @@ void BLI_reverselist(ListBase *lb)
 /**
  * \param vlink Link to make first.
  */
-void BLI_rotatelist(ListBase *lb, void *vlink)
+void BLI_rotatelist_first(ListBase *lb, void *vlink)
 {
 	/* make circular */
-	((LinkData *)lb->first)->prev = lb->last;
-	((LinkData *)lb->last)->next = lb->first;
+	((Link *)lb->first)->prev = lb->last;
+	((Link *)lb->last)->next = lb->first;
 
 	lb->first = vlink;
-	lb->last = ((LinkData *)vlink)->prev;
+	lb->last = ((Link *)vlink)->prev;
 
-	((LinkData *)lb->first)->prev = NULL;
-	((LinkData *)lb->last)->next = NULL;
+	((Link *)lb->first)->prev = NULL;
+	((Link *)lb->last)->next = NULL;
 }
 
+/**
+ * \param vlink Link to make last.
+ */
+void BLI_rotatelist_last(ListBase *lb, void *vlink)
+{
+	/* make circular */
+	((Link *)lb->first)->prev = lb->last;
+	((Link *)lb->last)->next = lb->first;
+
+	lb->first = ((Link *)vlink)->next;
+	lb->last = vlink;
+
+	((Link *)lb->first)->prev = NULL;
+	((Link *)lb->last)->next = NULL;
+}
 
 /* create a generic list node containing link to provided data */
 LinkData *BLI_genericNodeN(void *data)

source/blender/bmesh/operators/bmo_bridge.c

@@ -121,7 +121,7 @@ static void bm_bridge_best_rotation(struct BMEdgeLoopStore *el_store_a, struct B
 	}
 
 	if (el_b_best) {
-		BLI_rotatelist(lb_b, el_b_best);
+		BLI_rotatelist_first(lb_b, el_b_best);
 	}
 }
 
@@ -274,7 +274,7 @@ static void bridge_loop_pair(BMesh *bm,
 			const int len_b = BM_edgeloop_length_get(el_store_b);
 			ListBase *lb_b = BM_edgeloop_verts_get(el_store_b);
 			LinkData *el_b = BLI_rfindlink(lb_b, positive_mod(twist_offset, len_b));
-			BLI_rotatelist(lb_b, el_b);
+			BLI_rotatelist_first(lb_b, el_b);
 		}
 	}
 

source/blender/bmesh/operators/bmo_subdivide_edgering.c

@@ -919,13 +919,13 @@ static void bm_edgering_pair_order(BMesh *bm,
 		}
 		BLI_assert(node != NULL);
 
-		BLI_rotatelist(lb_b, node);
+		BLI_rotatelist_first(lb_b, node);
 
 		/* now check we are winding the same way */
 		if (bm_edgering_pair_order_is_flipped(bm, el_store_a, el_store_b)) {
 			BM_edgeloop_flip(bm, el_store_b);
 			/* re-ensure the first node */
-			BLI_rotatelist(lb_b, node);
+			BLI_rotatelist_first(lb_b, node);
 		}
 
 		/* sanity checks that we are aligned & winding now */

source/blender/editors/mesh/editmesh_tools.c

@@ -2913,7 +2913,7 @@ static void edbm_fill_grid_prepare(BMesh *bm, int span, int offset)
 		}
 
 		/* set this vertex first */
-		BLI_rotatelist(verts, v_act_link);
+		BLI_rotatelist_first(verts, v_act_link);
 		BM_edgeloop_edges_get(el_store, edges);
 
 		/* un-flag 'rails' */

source/blender/editors/object/object_transform.c

@@ -785,7 +785,7 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
 	}
 
 	if (ctx_ob_act) {
-		BLI_rotatelist(&ctx_data_list, (LinkData *)ctx_ob_act);
+		BLI_rotatelist_first(&ctx_data_list, (LinkData *)ctx_ob_act);
 	}
 
 	for (tob = bmain->object.first; tob; tob = tob->id.next) {