340f9d7ff3
Instead of modifying the active mesh in place, which means we can't use the size of its data arrays when copying its data, and its caches are immediately invalidated, copy data to a separate out-of-main result mesh first. The only downside is that for a moment during the operator the shape key array sizes will be out of sync with the mesh size. Also the custom data for multires layers wasn't copied properly after the recent refactor that rewrote this code. Take the opportunity to fix that too. The motivation for this change is an improvement to copy different kinds of custom normals properly to the joined mesh, which never worked since free custom normals were introduced. This contains a few changes to the expected results in the tests. Those are edge cases, and the new results make more sense.
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