Comment 0 for bug 1844853

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)