[Bf-blender-cvs] [4a440ecb99d] blender-v2.81-release: Fix T72071: Crash on snap to edge

[mano-wii]

Commit: 4a440ecb99d7f365c754e533023d127a9b806115
Author: mano-wii
Date:   Mon Dec 2 10:30:37 2019 -0300
Branches: blender-v2.81-release
https://developer.blender.org/rB4a440ecb99d7f365c754e533023d127a9b806115

Fix T72071: Crash on snap to edge

Caused when the vertices index is dirty due to some mesh editing
operation like Extrude

===================================================================

M	source/blender/editors/transform/transform_snap_object.c

===================================================================

diff --git a/source/blender/editors/transform/transform_snap_object.c b/source/blender/editors/transform/transform_snap_object.c
index f35a2808f22..c8fa48fefee 100644
--- a/source/blender/editors/transform/transform_snap_object.c
+++ b/source/blender/editors/transform/transform_snap_object.c
@@ -1312,7 +1312,7 @@ static short snap_mesh_polygon(SnapObjectContext *sctx,
     l_iter = l_first = BM_FACE_FIRST_LOOP(f);
     if (snapdata->snap_to_flag & SCE_SNAP_MODE_EDGE) {
       elem = SCE_SNAP_MODE_EDGE;
-      BM_mesh_elem_index_ensure(em->bm, BM_EDGE);
+      BM_mesh_elem_index_ensure(em->bm, BM_VERT | BM_EDGE);
       BM_mesh_elem_table_ensure(em->bm, BM_VERT | BM_EDGE);
       do {
         cb_snap_edge(&nearest2d,