@David I also had this concerns. But there is still the shadow which can be used to separate them. I attached a screenshot and in my opinion this seems distinguishable enough. So as I understand Mark this should be only a issue for Unity-2D which will then have the 1px border in opposite to the 0px border on Compiz-Unity.
** Attachment added: "distinguishable_shadow.png" https://bugs.launchpad.net/ubuntu/+source/light-themes/+bug/733233/+attachment/1905365/+files/distinguishable_shadow.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/733233 Title: Increase shadow area to 45 pixels (but not grip area) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs