This resulted in hair drawing with an offset if an instance_offset was
set.
note: Usually the instance_offset gets combined with the objects obmat
in 'make_duplis_collection' / 'make_dupli', see
> /* Combine collection offset and `obmat`. */
Using the resulting DupliObject->mat instead does include the
instance_offset, but this results in double-transforms (something that I
have not investigated further), so now reconstruct the correct matrix
from scratch.
Maniphest Tasks: T85301
Differential Revision: https://developer.blender.org/D10285
9e0c876aad