Merged address record data when switching from manual address to "Share With" address

Just tested this issue on demo site and confirmed it is a bug. You can see the results of my test on the demo site by looking at contact record "somebody clever" and where I added "compasspoint" address and how it maintained the additional address lines from the original address. I would suggest making a simple change that deletes any prior address info before updating to shared address space upon hitting save button. It does work correctly when typing address info in and deleting info in existing address fields when not using the "share with" selection. See my forum post http://forum.civicrm.org/index.php/topic,24905.0.html.