Public bug reported:

Summary:

Snapping a window to one side of the screen will often snap to the side
of the wrong monitor.

Steps to reproduce:

1. Have two monitors arranged side by side
2. Open a new application window such as nautilus or a terminal
3a. Grab the right half of the title bar of the window and drag it to the left 
side of the right monitor. Don't let go
or
3b. Grab the left half of the title bar of the window and drag it to the right 
side of the left monitor. Don't let go
  - The orange window snapping guide will appear in the correct place
4. Let go of the mouse
  - The window will snap to the wrong monitor

It appears due to the amount of the window hanging over the separation
gap between the displays, it will favour snapping to the wrong monitor.

Here's a video showing it: https://www.youtube.com/watch?v=bdJ6x9nnvOQ

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: gnome-shell 3.38.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.8.0-23.24-generic 5.8.14
Uname: Linux 5.8.0-23-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 22 09:40:58 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-08-15 (67 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
RebootRequiredPkgs:
 linux-image-5.8.0-25-generic
 linux-base
 linux-base
RelatedPackageVersions: mutter-common 3.38.1-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to groovy on 2020-09-20 (31 days ago)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1900984

Title:
  Multi-monitor window-snapping snaps to wrong display

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  Summary:

  Snapping a window to one side of the screen will often snap to the
  side of the wrong monitor.

  Steps to reproduce:

  1. Have two monitors arranged side by side
  2. Open a new application window such as nautilus or a terminal
  3a. Grab the right half of the title bar of the window and drag it to the 
left side of the right monitor. Don't let go
  or
  3b. Grab the left half of the title bar of the window and drag it to the 
right side of the left monitor. Don't let go
    - The orange window snapping guide will appear in the correct place
  4. Let go of the mouse
    - The window will snap to the wrong monitor

  It appears due to the amount of the window hanging over the separation
  gap between the displays, it will favour snapping to the wrong
  monitor.

  Here's a video showing it: https://www.youtube.com/watch?v=bdJ6x9nnvOQ

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: gnome-shell 3.38.1-1ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-23.24-generic 5.8.14
  Uname: Linux 5.8.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu50
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 22 09:40:58 2020
  DisplayManager: gdm3
  InstallationDate: Installed on 2020-08-15 (67 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  RebootRequiredPkgs:
   linux-image-5.8.0-25-generic
   linux-base
   linux-base
  RelatedPackageVersions: mutter-common 3.38.1-1ubuntu1
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to groovy on 2020-09-20 (31 days ago)

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