[Bug 1923347] [NEW] Selecting an area on the desktop is broken on multi-monitor setups in X11

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Daniel van Vugt (vanvugt):

[Impact]

This is a new bug as of yesterday or the day before. If I select an area
on the desktop on my rightmost monitor, the origin point of the
selection is placed correctly at the cursor position, but other point is
offset by the width of the leftmost monitor (see attached screenshot).

Basically, the origin point is correctly at (cursor X, cursor Y), but
the other point is at (cursor X + monitor offset X, cursor Y + monitor
offset Y).

[Test Plan]

Set up two monitors side-by-side and log into 'Ubuntu on Xorg'. Now on
the rightmost monitor select an area of the desktop. Ensure the corner
of the selection always matches the current cursor position.

[Where problems could occur]

Anywhere in the desktop icons selection behaviour. Unlikely given all
that is changing is the removal of an optional optimization.

[Other Info]

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: gnome-shell 3.38.4-1ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu62
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 11 14:04:05 2021
DisplayManager: gdm3
InstallationDate: Installed on 2019-09-14 (574 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
RelatedPackageVersions: mutter-common 3.38.4-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to hirsute on 2021-01-07 (93 days ago)

** Affects: gnome-shell-extension-desktop-icons-ng (Ubuntu)
     Importance: Medium
     Assignee: Daniel van Vugt (vanvugt)
         Status: Fix Released

** Affects: gnome-shell-extension-desktop-icons-ng (Ubuntu Hirsute)
     Importance: Medium
     Assignee: Daniel van Vugt (vanvugt)
         Status: In Progress

** Affects: gnome-shell-extension-desktop-icons-ng (Ubuntu Impish)
     Importance: Medium
     Assignee: Daniel van Vugt (vanvugt)
         Status: Fix Released


** Tags: amd64 apport-bug hirsute
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Selecting an area on the desktop is broken on multi-monitor setups in X11
https://bugs.launchpad.net/bugs/1923347
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