[Bug 1844853] [NEW] IBus no longer works in Qt applications after upgrade

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Gunnar Hjalmarsson (gunnarhj):

[Impact]

IBus was broken for Qt applications as a regression due to the fix of
CVE-2019-14822. As a result the IBus patch was disabled temporarily,
which fixed IBus from a usability POV.

The real fix has been made in glib2.0, and the proposed updates in the
below PPA will allow the IBus patch to be re-enabled.

https://launchpad.net/~gunnarhj/+archive/ubuntu/glib2.0

[Test Case]

 * On a standard Ubuntu {eoan,disco,bionic,xenial} installation
   - Upgrade the ibus packages from
     https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa
   - Install some IBus input method, e.g. ibus-libpinyin
   - Install some Qt application, e.g. Kate

* Relogin

* Add the input method to the input sources

* Open the Qt app and try to input something using the IBus IM

=> Find that only latin letters get inputted

* Upgrade the glib2.0 packages from {eoan,disco,bionic,xenial}-proposed

* Relogin (maybe reboot)

* Open the Qt app and try to input something using the IBus IM

=> Find that the transliteration works as expected

[Regression Potential]

The applicable patches origin from glib upstream:
https://gitlab.gnome.org/GNOME/glib/merge_requests/1176
Consequently the changes have been reviewed by the glib maintainer, but also tested by the IBus maintainer, by me (gunnarhj), and - of course - the author Simon McVittie. The changes have been in Debian unstable since 2019-10-30. 

[Original description]

Kubuntu Release 18.04.3 LTS

Expected behavior:
ibus continues working as before after applying security update 1.5.17-ubuntu5.1 from version 1.5.17-ubuntu5.

Observed behavior:
ibus is not usable anymore in Qt applications.

After updating ibus and the related packages ibus-gtk, ibus-gtk3, libibus-1.0-5 and gir1.2-ibus-1.0 all from version 1.5.17-ubuntu5 to 1.5.17-ubuntu5.1, I can no longer use ibus in Qt applications. Using shift-space no longer changes the selected input method and even when i switch to the mozc input method in a gtk application, i can not use it in any Qt applications.
When starting qtconfig in a terminal, I also get the following message:

Bus::open: Connect ibus failed!
IBusInputContext::createInputContext: no connection to ibus-daemon

This bug was not present in version 1.5.17-3ubuntu5 and I also confirmed
that downgrading the packages to version 1.5.17-3ubuntu4 restores ibus
functionality in Qt applications.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ibus 1.5.17-3ubuntu5.1
ProcVersionSignature: Ubuntu 5.0.0-30.32~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-30-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Sep 21 07:58:56 2019
InstallationDate: Installed on 2019-06-28 (84 days ago)
InstallationMedia: Kubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
SourcePackage: ibus
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: glib
     Importance: Unknown
         Status: Fix Released

** Affects: ibus
     Importance: Unknown
         Status: Fix Released

** Affects: glib2.0 (Ubuntu)
     Importance: High
         Status: Fix Committed

** Affects: ibus (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: glib2.0 (Ubuntu Xenial)
     Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: glib2.0 (Ubuntu Bionic)
     Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: glib2.0 (Ubuntu Disco)
     Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: glib2.0 (Ubuntu Eoan)
     Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: glib2.0 (Ubuntu Focal)
     Importance: High
         Status: Fix Committed

** Affects: ibus (Ubuntu Focal)
     Importance: High
         Status: Fix Released

** Affects: glib2.0 (Debian)
     Importance: Unknown
         Status: Fix Released


** Tags: amd64 apport-bug bionic regression-update
-- 
IBus no longer works in Qt applications after upgrade
https://bugs.launchpad.net/bugs/1844853
You received this bug notification because you are a member of Ubuntu Sponsors Team, which is subscribed to the bug report.