Check for no-op edge separates to quiet asserts when inset individual.

This causes no change in behavior, since code was alreadying doing
a no-op in bmesh_edge_separate if the edge is a boundary.
But it tripped an assert, annoying in debug builds.
We want to leave assert in bmesh_edge_separate in case callers
expect there to be separate loops after this always.
So putting test in caller.
(Same worry about bmesh_urmv_loop? I checked callers and they
appear OK to me - they deal with the no-op return.)

diff --git a/source/blender/bmesh/intern/bmesh_core.c b/source/blender/bmesh/intern/bmesh_core.c
index 5bb418a5102e637b725b01740f429431ec8b8d4b..b8f7b3f6b4545518996f5116aedd92d6bc299ddf 100644 (file)
--- a/source/blender/bmesh/intern/bmesh_core.c
+++ b/source/blender/bmesh/intern/bmesh_core.c
@@ -2395,6 +2395,8 @@ void bmesh_edge_separate(
  * Disconnects a face from its vertex fan at loop \a l_sep
  *
  * \return The newly created BMVert
+ *
+ * \note Will be a no-op and return original vertex if only two edges at that vertex.
  */
 BMVert *bmesh_urmv_loop(BMesh *bm, BMLoop *l_sep)
 {
@@ -2406,8 +2408,10 @@ BMVert *bmesh_urmv_loop(BMesh *bm, BMLoop *l_sep)
 
        /* peel the face from the edge radials on both sides of the
         * loop vert, disconnecting the face from its fan */
-       bmesh_edge_separate(bm, l_sep->e, l_sep, false);
-       bmesh_edge_separate(bm, l_sep->prev->e, l_sep->prev, false);
+       if (!BM_edge_is_boundary(l_sep->e))
+               bmesh_edge_separate(bm, l_sep->e, l_sep, false);
+       if (!BM_edge_is_boundary(l_sep->prev->e))
+               bmesh_edge_separate(bm, l_sep->prev->e, l_sep->prev, false);
 
        /* do inline, below */
 #if 0