Fix T66672: auto and manual texture space affected by modifiers

It should be based on the mesh bounds before modifier stack evaluation, but
some modifiers were causing it to be recomputed. The flag to disable texture
space recomputation was not preserved through modifier evaluation.

Differential Revision: https://developer.blender.org/D5225

source/blender/blenkernel/intern/mesh.c

@@ -665,6 +665,7 @@ static Mesh *mesh_new_nomain_from_template_ex(const Mesh *me_src,
 
   me_dst->cd_flag = me_src->cd_flag;
   me_dst->editflag = me_src->editflag;
+  me_dst->texflag = me_src->texflag;
 
   CustomData_copy(&me_src->vdata, &me_dst->vdata, mask.vmask, CD_CALLOC, verts_len);
   CustomData_copy(&me_src->edata, &me_dst->edata, mask.emask, CD_CALLOC, edges_len);