hidden windows appear as opened after clicking the "Show Applications" button twice

[Panos Asproulis]

Steps to reproduce this problem:

1. Click on the Ubuntu Dock to open any application e.g. Nautilus.
2. A window with the contents of this application appears.
3. Click the (-) hide button of the window. The window hides from the desktop.
4. Click the "Show Applications" button of the Ubuntu Dock.
5. After the list of available applications appears click the same button again. The system returns back to the desktop view.
6. Notice that the previously hidden window now appears as open on the desktop. However, it is only rendered and it is not functional. One cannot click on this window to hide it again, move it to another location or use the application associated with it. The only way to return to normal is to click the icon of this application on the Ubuntu Dock and in this case the window opens properly i.e. it is rendered again but this time it can be used.

Expected behaviour:

After step (5) one should return to the desktop with the window of the opened application still hidden.

Note that if several applications have been opened and their windows hidden then after operation (5) all previously hidden windows are now rendered on the desktop but they are not functional, as described above.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.0-2ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 30 03:00:40 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-02-12 (46 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
RelatedPackageVersions: mutter-common 3.36.0-2ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2020-03-27 (2 days ago)