a1a7317f6b
The idea is pretty simple: instead of making temporary copy of all the related custom data layers just pass the ownership from the DM to the mesh. This is really handy in cases when you've got DM which you need to convert to Mesh datablock and wouldn't need that DM after conversion anyway. Foe example, render database conversion, exporters and even Modifier Apply will benefit from this option. Reviewers: campbellbarton Differential Revision: https://developer.blender.org/D1127