Commit: fc185fb1d25d429d6bef2979f97c83ec5b4671a8
Author: Sergey Sharybin
Date:   Thu Feb 16 09:55:44 2017 +0100
Branches: master
https://developer.blender.org/rBfc185fb1d25d429d6bef2979f97c83ec5b4671a8

CDDM Copy: Only tag data layers dirty if we ignored tessellation data

This solves assert failure in CustomData_from_bmeshpoly() happening with
broom.blend file from barber shop SVN.

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

M       source/blender/blenkernel/intern/cdderivedmesh.c

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

diff --git a/source/blender/blenkernel/intern/cdderivedmesh.c 
b/source/blender/blenkernel/intern/cdderivedmesh.c
index 483fa977af..7042b46330 100644
--- a/source/blender/blenkernel/intern/cdderivedmesh.c
+++ b/source/blender/blenkernel/intern/cdderivedmesh.c
@@ -2428,8 +2428,12 @@ static DerivedMesh *cddm_copy_ex(DerivedMesh *source,
        dm->cd_flag = source->cd_flag;
        dm->dirty = source->dirty;
 
-       /* Tessellation data is never copied, so tag it here. */
-       dm->dirty |= DM_DIRTY_TESS_CDLAYERS;
+       /* Tessellation data is never copied, so tag it here.
+        * Only tag dirty layers if we really ignored tessellation faces.
+        */
+       if (!copy_tessface_data) {
+               dm->dirty |= DM_DIRTY_TESS_CDLAYERS;
+       }
 
        CustomData_copy_data(&source->vertData, &dm->vertData, 0, 0, numVerts);
        CustomData_copy_data(&source->edgeData, &dm->edgeData, 0, 0, numEdges);

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