Fix T81060: CustomData Correction sometimes breaks UVs and Vertex Colors

`CustomData_bmesh_interp` use the same CustomData decryptor (in this case, `bm->ldata`) in both blocks.

So make sure that all CustomData layers match.

This commit also removes redundant `BM_elem_attrs_copy_ex` calls.

Maniphest Tasks: T81060

Differential Revision: https://developer.blender.org/D9159

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/bmesh/intern/bmesh_construct.h b/source/blender/bmesh/intern/bmesh_construct.h
index 3523c4aec1a..f5102283ede 100644
--- a/source/blender/bmesh/intern/bmesh_construct.h
+++ b/source/blender/bmesh/intern/bmesh_construct.h
@@ -69,6 +69,10 @@ void BM_elem_select_copy(BMesh *bm_dst, void *ele_dst_v, const void *ele_src_v);
 void BM_mesh_copy_init_customdata(BMesh *bm_dst,
                                   BMesh *bm_src,
                                   const struct BMAllocTemplate *allocsize);
+void BM_mesh_copy_init_customdata_all_layers(BMesh *bm_dst,
+                                             BMesh *bm_src,
+                                             const char htype,
+                                             const struct BMAllocTemplate *allocsize);
 BMesh *BM_mesh_copy(BMesh *bm_old);
 
 char BM_face_flag_from_mflag(const char mflag);