Ghost copies of foreground dialogues when using GNOME Magnifier

[Lee Clark]

Affected version

Tested with Ubuntu 20.04 current daily build using Xorg. Mutter version 3.36.

Bug summary

When using the GNOME magnifier feature ghost copies of dialogues such as the Alt+F2 window or the password prompt appear if the magnified view moves away from the dialogue.

Steps to reproduce

1. Enable GNOME magnifier by pressing Supper + Alt + 8.
2. Press Alt+F2 to open the command dialogue.
3. Use the mouse to pan around the screen.

What happened

A slightly fadded copy of the dialogue will move around the screen, keeping its relative position.

What did you expect to happen

This should not happen. The dialogue should be displayed once and should move appropriately when the magnifier view pans away from it.

Upstream Bug:
https://gitlab.gnome.org/GNOME/mutter/issues/1100

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: mutter 3.35.91-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu20
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar 21 19:43:49 2020
InstallationDate: Installed on 2020-03-20 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200320)
SourcePackage: mutter
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

It appears this was https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3305 which was fixed in https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1899 (released in gnome-shell 41.0).