Your message dated Tue, 13 Oct 2026 22:50:05 +0900
with message-id <20261013225005.1daeabd3@jet>
and subject line Re: Bug#985709: ibus-mozc: mozc-tool ignores KDE Qt theme
has caused the Debian Bug report #985709,
regarding ibus-mozc: mozc-tool ignores KDE Qt theme
to be marked as done.
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985709: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985709
Debian Bug Tracking System
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--- Begin Message ---
Package: ibus-mozc
Version: 2.26.4220.100+dfsg-4ubuntu2
Severity: normal
X-Debbugs-Cc: [email protected]
This was orignally reported in Ubuntu downstream at
https://bugs.launchpad.net/ubuntu/+source/mozc/+bug/1920578 . I am
reporting it upstream as per the maintainer's instructions.
Summary:
Mozc ignores my KDE Qt theme, and uses the ugly fallback theme.
1) The release of Ubuntu you are using, via 'lsb_release -rd' or System ->
About Ubuntu
Description: Ubuntu Hirsute Hippo (development branch)
Release: 21.04
2) The version of the package you are using, via 'apt-cache policy pkgname' or
by checking in Software Center
mozc-utils-gui:
Installed: 2.26.4220.100+dfsg-4ubuntu2
Candidate: 2.26.4220.100+dfsg-4ubuntu2
Version table:
*** 2.26.4220.100+dfsg-4ubuntu2 500
500 http://archive.ubuntu.com/ubuntu hirsute/universe amd64 Packages
100 /var/lib/dpkg/status
3) What you expected to happen
The UI should use the configured Qt theme like all Qt applications. For an
example of an application with the correct theme, you can open Dolphin, and
click the overflow menu, then "Configure Dolphin".
The "OK", "Apply", and "Cancel" buttons are particularly easy to compare.
4) What happened instead
The UI looks very ugly and out of place compared to the rest of the system. It
looks like it's falling back to the default Qt theme. It doesn't look like a
piece of software bundled with Ubuntu, but rather like downloaded 3rd-party
software that bundles its own Qt like Anki (dark mode), Genymotion, Binary
Ninja, and (old versions of) MultiMC.
Another relevant comment:
> Assuming you are using Kubuntu, I don't have access to any Kubuntu install ATM
> Do you know if the issue is present in e.g. 20.04 or 20.10 as well?
I spun up Kubuntu 20.04, 20.10, and 21.04 live CD VMs. I found the theming
issue is present neither in 20.04 nor 20.10. On those versions, (aside from the
one minor problem of the line underneath the tab) the dialog fits in like a
native KDE application. It seems like this is a regression introduced in 21.04.
The about box text is still illegible in all three versions.
Attached is the newly-found expected behaviour, as it was in 20.04 and 20.10.
-- System Information:
Debian Release: bullseye/sid
APT prefers hirsute
APT policy: (500, 'hirsute')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.11.7-surface (SMP w/8 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages ibus-mozc depends on:
ii ibus 1.5.24-1
ii libabsl20200923 0~20200923.3-3
ii libc6 2.33-0ubuntu2
ii libglib2.0-0 2.67.5-2
ii libibus-1.0-5 1.5.24-1
ii libprotobuf23 3.12.4-1ubuntu1
ii libstdc++6 11-20210310-1ubuntu1
ii libxcb-xfixes0 1.14-3ubuntu1
ii libxcb1 1.14-3ubuntu1
ii mozc-data 2.26.4220.100+dfsg-4ubuntu2
ii mozc-server 2.26.4220.100+dfsg-4ubuntu2
ii tegaki-zinnia-japanese 0.3-1.1
ibus-mozc recommends no packages.
Versions of packages ibus-mozc suggests:
ii mozc-utils-gui 2.26.4220.100+dfsg-4ubuntu2
-- no debconf information
--- End Message ---
--- Begin Message ---
Hi,
I looked into this with the current version (mozc
3.33.6133+ds1-0.1, Qt 6.11.2, Plasma 6.7.4.
Even though src/gui/base/util.cc forces the fusion style:
// static
std::unique_ptr<QApplication> GuiUtil::InitQt(int &argc, char
*argv[]) {
QApplication::setStyle(QStyleFactory::create(QLatin1String("fusion")));
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); #endif //
QT_VERSION
the mozc dialogs seem to follow the configured Qt style.
I compared them with "dolphin" and "dolphin -style fusion",
and mozc-tool looks the same as <dolphin without -style fusion>.
QT_STYLE_OVERRIDE was <not set>.
So I could not reproduce this issue any more.
I did not test older versions, and o-o-stable (bullseye) is no longer
supported, so I am closing this bug.
If you still see this issue with the current version,
please feel free to reopen it.
Best Regards,
On Wed, 24 Mar 2021 18:25:39 +0100 Gunnar Hjalmarsson
<[email protected]> wrote:
> On 2021-03-24 14:37, Daniel T wrote:
> > Doing just `dpkg -i
> > mozc-utils-gui_2.23.2815.102+dfsg-10build1_amd64.deb` does indeed
> > solve the problem.
>
> Thanks!
>
> @Nobuhiro: Should this be reported upstream? I don't see anything
> about it in the upstream issue tracker.
>
> --
> Gunnar Hjalmarsson
> https://launchpad.net/~gunnarhj
>
--- End Message ---
