If it's a feature, it's broken because of buttons (comment #13) and because it looks really ugly with light themes (see the attached screenshot; it looks bad when using, for example, Radiance).
** Attachment added: "radiance.png" https://bugs.launchpad.net/unity/+bug/912682/+attachment/2673283/+files/radiance.png -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/912682 Title: Compiz add transparency to titlebar along with the panel To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/912682/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp

