For reference, here is the commit from the Arc theme that fixes/works around this issue:
* https://github.com/horst3180/arc- theme/commit/5b15bdc4425b6b3b8e374f76541f020419663edd ** Also affects: ubuntu-mate-artwork (Ubuntu) Importance: Undecided Status: New ** Changed in: ubuntu-mate-artwork (Ubuntu) Status: New => Triaged ** Also affects: ubuntu-themes (Ubuntu) Importance: Undecided Status: New ** Changed in: ubuntu-themes (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624571 Title: White lines visible around toolbars in LibreOffice when using GTK3 and a dark theme To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1624571/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
