Public bug reported:
Environment:
- LibreOffice 26.2.5.2 (X86_64), Build ID 620(Build:2)
- Ubuntu package version: 4:26.2.5.2-0ubuntu0.26.04.1
- Ubuntu with GNOME on Wayland
- Display scaling: 125% (fractional), via GNOME experimental feature
"scale-monitor-framebuffer"
- About LibreOffice shows: UI render: default, VCL: gtk3, Calc: threaded
Steps to reproduce:
1. In GNOME Settings -> Displays, set the scale to 125% (fractional scaling).
2. Open LibreOffice Calc.
3. Click any cell and move the selection with the arrow keys.
4. Optionally enable View -> Column/Row Highlighting.
Actual result:
- The active cell rectangle (selection outline) is not drawn, or is drawn at
random/wrong positions with wrong dimensions.
- Column/row highlighting also produces no visible effect.
- The Name Box and the formula bar still update to the new cell reference,
so the selection is registered; only the overlay is not rendered.
Expected result:
The active cell outline (and column/row highlighting) should be drawn at the
correct position at any display scale.
Backend test results (all run on a clean profile):
- default (gtk3, Wayland): overlay not drawn
- GDK_BACKEND=x11 (gtk3 on X11): overlay at random/wrong positions, wrong size
- GTK_THEME=Adwaita: overlay not drawn
- SAL_USE_VCLPLUGIN=gtk4: overlay not drawn
- SAL_USE_VCLPLUGIN=qt6: overlay not drawn
- SAL_USE_VCLPLUGIN=gen: overlay drawn correctly (but UI ignores HiDPI scaling)
- SAL_FORCEDPI=120: no effect
Additional notes:
- Setting the scale to an integer value (100% or 200%) would likely work
around the issue, but it is not an acceptable solution for this setup.
- "UI render: default" means Skia is not active, so hardware acceleration
is not the cause.
- The bug disappears with the "gen" backend, which does not apply display
scaling. This points to a coordinate/scaling bug in the selection overlay
under fractional scaling.
Possible related reports:
- LibreOffice Bug 172490 (GTK3 + display scaling draws overlay in wrong
location on X11)
- LibreOffice Bug 171590 (active cell rectangle rendering regression)
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: libreoffice (not installed)
ProcVersionSignature: Ubuntu 7.0.0-34.34-generic 7.0.14
Uname: Linux 7.0.0-34-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 27 16:27:43 2026
InstallationDate: Installed on 2024-08-29 (759 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
SourcePackage: libreoffice
UpgradeStatus: Upgraded to resolute on 2026-08-28 (30 days ago)
** Affects: libreoffice (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2168670
Title:
Calc: active cell / selection overlay not drawn with fractional
display scaling (125%) on GNOME Wayland — affects gtk3, gtk4 and qt6
backends, works only with 'gen'
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