I don't think it is really a bug. Workspace switching is a smooth(ish) animation. Not instantaneous. As part of that animation, windows from the old workspace fly out and windows from the new workspace fly in. If your monitors are arranged vertically then this means the windows are indeed flying over the other monitor that's not switching.
Possible solutions would be: (a) Gnome Tweaks > Appearance > Animations = OFF ; or (b) Arrange your monitors horizontally ; or (c) Ask Gnome for a new feature to arrange workspaces horizontally ; or (d) Ask Gnome to hide windows from the other monitor during switch animations. If you wish to go ahead with (c) or (d) then please report it at https://gitlab.gnome.org/GNOME/gnome-shell/issues and let us know the ID of the new bug. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1774498 Title: Windows flash by external screen on workspace change Status in gnome-shell package in Ubuntu: Incomplete Bug description: gnome-shell has the very interesting default of only doing virtual desktops on the internal screen. This works fine but has a strange visual glitch when changing virtual desktops where the contents of the internal screen flash through the external one. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-shell 3.28.1-0ubuntu2 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu May 31 21:06:47 2018 DisplayManager: gdm3 InstallationDate: Installed on 2018-05-31 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: gnome-shell UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1774498/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
