I just updated from the provided ppa and tested it out. Seems to be working as intended, and also looks like it'll fix Bug #880262 as well! Check my provided screenshot if you want to confirm everything looks as it's supposed to.
** Attachment added: "Screenshot of fix.png" https://bugs.launchpad.net/ubuntu/+source/gnome-sushi/+bug/876805/+attachment/3095342/+files/Screenshot%20of%20fix.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/876805 Title: Sushi does not use Ambiance theme window decorations To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-sushi/+bug/876805/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs