gnome-shell right mouse click brings minimized windows to foreground

[Rocko]

In today's update of Ubuntu 20.04, if I do this:

* Run Firefox non-maximized
* Run another app (eg nautilus or gnome-terminal)
* Minimize the other app
* Right-click on the firefox window

then the other app suddenly re-appears. You can only interact with its titlebar, though - you can't type into gnome-terminal or choose a file in nautilus. Using the titlebar, you can move it around and if you click on the maximize icon or double-click to maximize it, it explodes out into nothingness (effectively, it re-minimizes). You can't minimize it, though, using the minimize button.

This happens both in Wayland and in X11 and it happens with all extensions disabled.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.0-2ubuntu1
Uname: Linux 5.6.0-050600rc7-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 27 17:50:39 2020
DisplayManager: gdm3
InstallationDate: Installed on 2019-07-01 (270 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190606)
RelatedPackageVersions: mutter-common 3.36.0-2ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2019-12-08 (110 days ago)

[bart (bart-wp)]

Slightly different ba might have the same origin:

If I right-klick in a Firefox window, windows from other workspaces are shown in the background of the current workspace.

These windows are "inactive" except for the titlebar

[bart (bart-wp)]

For me the error pops up on a standard 20.4 (daily) installation and the error appeared yesterday 26.3.2020

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rocko (rockorequin)]

This doesn't happen with every application, eg right-clicking in Firefox, nautilus, and gnome-terminal demonstrates the bug, but right-clicking in google-chrome doesn't.

Also, the behaviour is slightly different in Wayland vs X11 - in X11 I can't interact with the backgrounded window's titlebar but I can move the window using the super key and mouse.

[Daniel van Vugt (vanvugt)]

Sounds closely related to bug 1868896. But see also bug 1868911 (comment #2).