I can confirm this issue. Many modern GNOME applications are affected. I have seen this behavior with Nautilus, GNOME Calendar and GNOME Software (see attached screencast).
** Tags added: eoan focal ** Attachment added: "Screencast from fresh installed system Ubuntu-MATE 20.04 LTS _Focal Fossa_ - Alpha amd64 (20200119)" https://bugs.launchpad.net/ubuntu-mate/+bug/1854383/+attachment/5321571/+files/gnome-software.gif ** Also affects: gtk+3.0 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop 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 Ubuntu MATE: Confirmed Status in gtk+3.0 package in Ubuntu: New 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-mate/+bug/1854383/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
