Default Gnome desktop, the taskbar touches the desktop icon highlight square. If the mouse cursor over the icon leaves the icon by moving over the taskbar, the icon remains highlighted. The highlight remains when another icon is highlighted or a window activated. Multiple icons may be left in the highlighted state. The highlight is turned off by moving the mouse over the icon and then off the icon onto the desktop.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
Codename: focal
Note the two libgnome-desktop packages, 3.18 and 3.19
This installation was started about a week ago, just before the beta release.
$dpkg -l |grep gnome |grep desk
ii gir1.2-gnomedesktop-3.0:amd64 3.36.0-1ubuntu1 amd64 Introspection data for GnomeDesktop
ii gnome-calculator 1:3.36.0-1ubuntu1 amd64 GNOME desktop calculator
ii gnome-control-center 1:3.36.1-1ubuntu3 amd64 utilities to configure the GNOME desktop
ii gnome-control-center-faces 1:3.36.1-1ubuntu3 all utilities to configure the GNOME desktop - faces images
ii gnome-desktop3-data 3.36.0-1ubuntu1 all Common files for GNOME desktop apps
ii gnome-menus 3.36.0-1ubuntu1 amd64 GNOME implementation of the freedesktop menu specification
ii gnome-online-accounts 3.36.0-1ubuntu1 amd64 service to manage online accounts for the GNOME desktop
ii gnome-power-manager 3.32.0-2 amd64 power management tool for the GNOME desktop
ii gnome-shell 3.36.0-2ubuntu2 amd64 graphical shell for the GNOME desktop
ii gnome-shell-extension-desktop-icons 19.10.2+git20200223-1 all desktop icon support for GNOME Shell
ii gnome-todo 3.28.1-5 amd64 minimalistic personal task manager designed to fit GNOME desktop
ii libgnome-desktop-3-18:amd64 3.34.2-2ubuntu1 amd64 Utility library for loading .desktop files - runtime files
ii libgnome-desktop-3-19:amd64 3.36.0-1ubuntu1 amd64 Utility library for loading .desktop files - runtime files
ii libgnome-menu-3-0:amd64 3.36.0-1ubuntu1 amd64 GNOME implementation of the freedesktop menu specification
ii yaru-theme-gnome-shell 20.04.4 all Yaru GNOME Shell desktop theme from the Ubuntu Community
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell-extension-desktop-icons 19.10.2+git20200223-1
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 5 09:41:19 2020
InstallationDate: Installed on 2020-02-29 (35 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200220)
PackageArchitecture: all
SourcePackage: gnome-shell-extension-desktop-icons
UpgradeStatus: No upgrade log present (probably fresh install)
Thank you for your bug report, could you report it upstream on
https:/