Public bug reported:
When positioning windows on a 21:9 ultrawide secondary monitor
(2560×1080), the window manager / compositor exhibits two problems:
Right-half snap overflows the screen. Snapping a window to the right half —
either by dragging it to the right edge until the snap zone highlights and
releasing, or with Super+Right — leaves the window shifted to the right so that
it extends past the right edge of the monitor, instead of filling the right
half. This persists after releasing the mouse button; it is the final placed
state, not a mid-drag preview. Snapping to the left half (0–1280) works
correctly.
Ghosted double-render during transitions. While moving or resizing a window
(both during edge-snap with the mouse and after Super+Arrow), a stale copy of
the window's previous frame remains painted on screen alongside the new
position for a fraction of a second, producing a brief "double window" artifact
(two overlapping title bars / two browser logos side by side).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: gnome-shell 50.1-0ubuntu1
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 5 21:55:34 2026
DisplayManager: gdm3
InstallationDate: Installed on 2026-05-25 (11 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
ProcEnviron:
LANG=pl_PL.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
RelatedPackageVersions: mutter-common 50.1-0ubuntu2.1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "Video of the bug"
https://bugs.launchpad.net/bugs/2155749/+attachment/5975858/+files/window_snapping_bug.mp4
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https://bugs.launchpad.net/bugs/2155749
Title:
Window snapping on 21:9 secondary monitor: window overflows right edge
on right-half snap + ghosted double-render during move/resize
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