Contribution Data Lost on Membership Merge

When two contacts with memberships of the same type are merged and the 'Memberships' box is checked on the merge form, contributions that were recorded as membership payments will be dropped from the contact marked as duplicate.

Steps to reproduce:

1. Identify two contacts to merge
2. Create memberships of the same type (i.e. 'Student' on the demo site) for each contact.
3. Record any number of membership payments for each contact under 'Membership Payment and Receipt'
4. Merge the two contacts with "Move related.... Memberships" and "Move related.... Contributions" checked.

All membership contributions from the duplicate contact will be dropped.

Listing the versions I have reproduced this bug in the demo site on under 'Affects Versions'.