Commit: 119ff676e1b348a66e33cd857089e78a5195a3c5
Author: Bastien Montagne
Date:   Sat Jan 17 17:38:31 2015 +0100
Branches: master
https://developer.blender.org/rB119ff676e1b348a66e33cd857089e78a5195a3c5

Fix T43283: Crash on undo/redo/ and save/reload after (new) weight transfer.

Mesh stores its dvert in a specific pointer too, in addition of regular CD 
layer...
That whole vgroup handling is really breaking apart the 'universality' of CD 
system. :(

Also added some DAG and WM updates in operators...

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

M       source/blender/blenkernel/intern/data_transfer.c
M       source/blender/editors/object/object_data_transfer.c

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

diff --git a/source/blender/blenkernel/intern/data_transfer.c 
b/source/blender/blenkernel/intern/data_transfer.c
index d41c747..c8a5da9 100644
--- a/source/blender/blenkernel/intern/data_transfer.c
+++ b/source/blender/blenkernel/intern/data_transfer.c
@@ -690,13 +690,19 @@ static bool data_transfer_layersmapping_generate(
                        return true;
                }
                else if (cddata_type == CD_FAKE_MDEFORMVERT) {
+                       bool ret;
+
                        cd_src = dm_src->getVertDataLayout(dm_src);
                        cd_dst = dm_dst ? dm_dst->getVertDataLayout(dm_dst) : 
&me_dst->vdata;
 
-                       return data_transfer_layersmapping_vgroups(r_map, 
mix_mode, mix_factor, mix_weights,
-                                                                  
num_elem_dst, use_create, use_delete,
-                                                                  ob_src, 
ob_dst, cd_src, cd_dst, dm_dst != NULL,
-                                                                  fromlayers, 
tolayers);
+                       ret = data_transfer_layersmapping_vgroups(r_map, 
mix_mode, mix_factor, mix_weights,
+                                                                 num_elem_dst, 
use_create, use_delete,
+                                                                 ob_src, 
ob_dst, cd_src, cd_dst, dm_dst != NULL,
+                                                                 fromlayers, 
tolayers);
+
+                       /* Mesh stores its dvert in a specific pointer too. :( 
*/
+                       me_dst->dvert = CustomData_get_layer(&me_dst->vdata, 
CD_MDEFORMVERT);
+                       return ret;
                }
                else if (cddata_type == CD_FAKE_SHAPEKEY) {
                        /* TODO: leaving shapekeys asside for now, quite 
specific case, since we can't access them from MVert :/ */
diff --git a/source/blender/editors/object/object_data_transfer.c 
b/source/blender/editors/object/object_data_transfer.c
index f6cf031..ec3ae92 100644
--- a/source/blender/editors/object/object_data_transfer.c
+++ b/source/blender/editors/object/object_data_transfer.c
@@ -42,6 +42,7 @@
 
 #include "BKE_context.h"
 #include "BKE_data_transfer.h"
+#include "BKE_depsgraph.h"
 #include "BKE_DerivedMesh.h"
 #include "BKE_mesh_mapping.h"
 #include "BKE_mesh_remap.h"
@@ -393,6 +394,8 @@ static int data_transfer_exec(bContext *C, wmOperator *op)
                        }
                }
 
+               DAG_id_tag_update(&ob_dst->id, OB_RECALC_DATA);
+
                if (reverse_transfer) {
                        SWAP(Object *, ob_src, ob_dst);
                }
@@ -400,6 +403,8 @@ static int data_transfer_exec(bContext *C, wmOperator *op)
 
        BLI_freelistN(&ctx_objects);
 
+       WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, NULL);
+
 #if 0  /* TODO */
        /* Note: issue with that is that if canceled, operator cannot be 
redone... Nasty in our case. */
        return changed ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
@@ -592,6 +597,8 @@ static int datalayout_transfer_exec(bContext *C, wmOperator 
*op)
 
                BKE_object_data_transfer_layout(scene, ob_src, ob_dst, 
dtmd->data_types, use_delete,
                                                dtmd->layers_select_src, 
dtmd->layers_select_dst);
+
+               DAG_id_tag_update(&ob_dst->id, OB_RECALC_DATA);
        }
        else {
                Object *ob_src = ob_act;
@@ -621,11 +628,15 @@ static int datalayout_transfer_exec(bContext *C, 
wmOperator *op)
                                BKE_object_data_transfer_layout(scene, ob_src, 
ob_dst, data_type, use_delete,
                                                                
layers_select_src, layers_select_dst);
                        }
+
+                       DAG_id_tag_update(&ob_dst->id, OB_RECALC_DATA);
                }
 
                BLI_freelistN(&ctx_objects);
        }
 
+       WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, NULL);
+
        return OPERATOR_FINISHED;
 }

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