Ubuntu 25.04 - Inconsistent Window Button Sizes Across GTK Apps

[Cristiano Fraga G. Nunes]

[ Impact ]

After upgrading system packages on Ubuntu 25.04, the window control buttons (minimize, maximize, close) appear at inconsistent sizes across different GTK applications.

[ Test Case | for libadwaita bug ]

1. Run nautilus, the close buttons circle should have padding
   (similar to GNOME terminal)

[ Test Case | for yaru bug ]

1. Run a pure gtk4 application such as gtk4-demo
2. the close buttons circle should have padding (similar to GNOME terminal)

[ Regression potential ]

Very low, some windows may have extra-large window buttons.

---

**Description:**

After upgrading system packages on Ubuntu 25.04, the window control buttons (minimize, maximize, close) appear at inconsistent sizes across different GTK applications.

For example:
- In **Nautilus** and **GNOME Text Editor**, the window buttons are noticeably **smaller**.
- In **GNOME Terminal**, the window buttons appear **larger**, as expected.

**Steps to Reproduce:**

1. Install Ubuntu using the `ubuntu-25.04-beta-desktop-amd64.iso`.
2. Observe that window button sizes are consistent across GTK apps.
3. Upgrade system packages using the default package manager (`sudo apt update && sudo apt upgrade`).
4. Restart and observe the change in window button sizes across different GTK applications.

**Expected Behavior:**

Window button sizes should remain consistent across all GTK apps, before and after system updates.

**Actual Behavior:**

After the system upgrade, some apps (e.g., Nautilus, GNOME Text Editor) display smaller window buttons, while others (e.g., GNOME Terminal) retain larger buttons.

**Additional Info:**

- ISO used: `ubuntu-25.04-beta-desktop-amd64.iso`
- This issue was not present in the clean installation, only after the upgrade.
- Affects multiple core GNOME apps.

ProblemType: BugDistroRelease: Ubuntu 25.04
Package: gnome-shell 48.0-1ubuntu1
ProcVersionSignature: Ubuntu 6.14.0-11.11-generic 6.14.0-rc7
Uname: Linux 6.14.0-11-generic x86_64
ApportVersion: 2.32.0-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 10 22:59:06 2025
DisplayManager: gdm3
InstallationDate: Installed on 2025-04-11 (0 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Beta amd64 (20250326.6)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions: mutter-common 48.1-1ubuntu3SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

The difference between GTK apps is because most use GTK4, but some (Terminal) use GTK3.

Either way, the button style is Yaru's responsibility.

[Andreas Hasenack (ahasenack)]

Hello Cristiano, or anyone else affected,

Accepted libadwaita-1 into plucky-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/libadwaita-1/1.7.0-1ubuntu2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-plucky to verification-done-plucky. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-plucky. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Andreas Hasenack (ahasenack)]

When QQ opens, be sure to use 1ubuntu3 (or higher upstream) for the upload.

[Pierre Bordeau (pierrebrd7)]

I tested the version from plucky-proposed and it doesn't completely fix the issue. It works well when Yaru is defined as the gtk theme ("Legacy Applications" in Gnome Tweaks), but when I select another theme (the Default theme or adw-gtk3, a theme that brings adwaita theming to gtk3 apps), I still have the small buttons.

Actually the problem of the small buttons in libadwaita apps does not come from Yaru, it is a libadwaita issue that has already been fixed in upstream libadwaita 1.7.2 (see https://gitlab.gnome.org/GNOME/libadwaita/-/issues/1022 and the fix commit that only changes 1 character : https://gitlab.gnome.org/GNOME/libadwaita/-/commit/53a4f46d3a390d617b3d91463725184145c43287 )

So I believe that integrating the upstream fix would be a better idea since it would work without being limited to the Yaru theme.