Sergey Sharybin
c8cca88851
The issue was happening with a specific file where the ID management code was not fully copying all modifiers because of the extra check in the `BKE_object_support_modifier_type_check()`. While it is arguable that copy-on-write should be a 1:1 copy there is no real need to maintain the per-modifier pointer to its original. Use its SessionUUID to perform lookup in the original datablock. Downside of this approach is that it is a linear lookup instead of direct pointer access, but the upside is that there is less pointers to manage and that the file with unsupported modifiers does behave correct without any asserts. Differential Revision: https://developer.blender.org/D13993