This issue is caused by `mate-maximus` which is part of the `mate- netboot` package. `mate-netboot` doesn't get much upstream development attention so unlikely to fixed in the near future.
Ubuntu MATE provides several resolution-efficient panel layouts, so removing `mate-netbook` from Ubuntu MATE is the best option for addressing this issue. mate-netbook was removed from ubuntu-mate-meta 1.281: - https://launchpad.net/ubuntu/+source/ubuntu-mate-meta/1.281 ** Changed in: marco (Ubuntu) Status: New => Invalid ** Changed in: gtk+3.0 (Ubuntu) Status: Confirmed => Invalid ** Also affects: mate-netbook (Ubuntu) Importance: Undecided Status: New ** No longer affects: ubuntu-mate ** Also affects: ubuntu-mate-meta (Ubuntu) Importance: Undecided Status: New ** Changed in: ubuntu-mate-meta (Ubuntu) Assignee: (unassigned) => Martin Wimpress (flexiondotorg) ** Changed in: ubuntu-mate-meta (Ubuntu) Importance: Undecided => High ** Changed in: ubuntu-mate-meta (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu. https://bugs.launchpad.net/bugs/1854383 Title: Extra window decorations are created on windows with client-side decorations. Status in gtk+3.0 package in Ubuntu: Invalid Status in marco package in Ubuntu: Invalid Status in mate-netbook package in Ubuntu: New Status in ubuntu-mate-meta package in Ubuntu: Fix Released Bug description: Steps to reproduce after a minimal/full install of Ubuntu MATE: 1. Start up a Gtk3 application with a header bar (tested with Gnome Software) or a browser (such as Firefox) without using a standard window title bar that saves the position and size of the window before it was closed. 2. Maximize the application window, then close it without changing the window size 3. Relaunch the application and resize/unmaximize it After this, dummy window decorations will be created around the window. This issue has been tested on a Dell XPS 9570 and using Gnome Boxes 3.34. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1854383/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
