Bizarrely I /think/ that might be correct behaviour.
By default workspaces do not span all displays. So as you scroll between
workspaces you probably will and should see windows from one display fly
over the other. Because workspaces don't span all displays by default.
Not completely sure since I haven't tried using multiple monitors with
multiple workspaces myself.
Have a look in gnome-tweaks and see if "Workspaces span displays"
improves things at all...?
** Summary changed:
- Windows flash by external screen on virtual desktop change
+ Windows flash by external screen on workspace change
** Changed in: gnome-shell (Ubuntu)
Status: Expired => New
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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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)
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https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1774498/+subscriptions
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