Just moved to Ubuntu 18.04 and can confirm the issue and it does seem to be something related to the window manager. I can confirm this only happens with a maximized window and in 16.04 it would happen with gnome but not Unity.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573728 Title: Files opened with gedit on command line no longer open within the existing gedit session To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gedit/+bug/1573728/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
