[Bf-blender-cvs] [b3fe1358547] blender-v3.0-release: Fix T94197: Applying boolean with fast solver clears bevel weights

[Campbell Barton]

Commit: b3fe135854776079353169fc1bbec2eeb8acef00
Author: Campbell Barton
Date:   Tue Jan 18 21:17:43 2022 +1100
Branches: blender-v3.0-release
https://developer.blender.org/rBb3fe135854776079353169fc1bbec2eeb8acef00

Fix T94197: Applying boolean with fast solver clears bevel weights

For boolean operations only one of the meshes was checked to determine
if bevel weights should be created.

Now initialize custom data from both meshes flag.
Note that this is a localized fix to be back-ported, further changes
will be made so edit-mode conversion accounts for this
without the caller needing explicit checks for custom-data flags.

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

M	source/blender/modifiers/intern/MOD_boolean.cc

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

diff --git a/source/blender/modifiers/intern/MOD_boolean.cc b/source/blender/modifiers/intern/MOD_boolean.cc
index 1121e30b0ff..e25522a7649 100644
--- a/source/blender/modifiers/intern/MOD_boolean.cc
+++ b/source/blender/modifiers/intern/MOD_boolean.cc
@@ -252,9 +252,13 @@ static BMesh *BMD_mesh_bm_create(
    * otherwise the wrong active render layer is used, see T92384. */
   BM_mesh_copy_init_customdata_from_mesh(bm, mesh, &allocsize);
 
-  BMeshFromMeshParams params{};
-  params.calc_face_normal = true;
-  BM_mesh_bm_from_me(bm, mesh_operand_ob, &params);
+  /* NOTE(@campbellbarton): Handle in #BM_mesh_bm_from_me, this is a local fix for T94197. */
+  BM_mesh_cd_flag_apply(bm,
+                        mesh->cd_flag | mesh_operand_ob->cd_flag | BM_mesh_cd_flag_from_bmesh(bm));
+
+  BMeshFromMeshParams bmesh_from_mesh_params{};
+  bmesh_from_mesh_params.calc_face_normal = true;
+  BM_mesh_bm_from_me(bm, mesh_operand_ob, &bmesh_from_mesh_params);
 
   if (UNLIKELY(*r_is_flip)) {
     const int cd_loop_mdisp_offset = CustomData_get_offset(&bm->ldata, CD_MDISPS);
@@ -265,7 +269,7 @@ static BMesh *BMD_mesh_bm_create(
     }
   }
 
-  BM_mesh_bm_from_me(bm, mesh, &params);
+  BM_mesh_bm_from_me(bm, mesh, &bmesh_from_mesh_params);
 
   return bm;
 }