dead keys not functionnal under all qt apps with ibus IME

This bug appeared with 10.04. This is a serious regression, it makes qt apps worthless for typing french on an user account that may also write some japanese.
Description: Ubuntu 11.10
Release: 11.10

$ dpkg -l |grep qt4
ii ibus-qt4 1.3.1-1ubuntu3 qt-immodule for ibus (QT4)
ii libntrack-qt4-1 014+bzr312-0ubuntu2 qt4 API for ntrack
ii libqt4-dbus 4:4.7.4-0ubuntu8 Qt 4 D-Bus module
ii libqt4-declarative 4:4.7.4-0ubuntu8 Qt 4 Declarative module
ii libqt4-declarative-gestures 4:4.7.4-0ubuntu8 Qt 4 gestures QML plugin
ii libqt4-declarative-particles 4:4.7.4-0ubuntu8 Qt 4 particles QML plugin
ii libqt4-declarative-shaders 4:4.7.4-0ubuntu8 Qt 4 shaders QML plugin
ii libqt4-designer 4:4.7.4-0ubuntu8 Qt 4 designer module
ii libqt4-dev 4:4.7.4-0ubuntu8 Qt 4 development files
ii libqt4-help 4:4.7.4-0ubuntu8 Qt 4 help module
ii libqt4-network 4:4.7.4-0ubuntu8 Qt 4 network module
ii libqt4-opengl 4:4.7.4-0ubuntu8 Qt 4 OpenGL module
ii libqt4-opengl-dev 4:4.7.4-0ubuntu8 Qt 4 OpenGL library development files
ii libqt4-qt3support 4:4.7.4-0ubuntu8 Qt 3 compatibility library for Qt 4
ii libqt4-script 4:4.7.4-0ubuntu8 Qt 4 script module
ii libqt4-scripttools 4:4.7.4-0ubuntu8 Qt 4 script tools module
ii libqt4-sql 4:4.7.4-0ubuntu8 Qt 4 SQL module
ii libqt4-sql-mysql 4:4.7.4-0ubuntu8 Qt 4 MySQL database driver
ii libqt4-sql-sqlite 4:4.7.4-0ubuntu8 Qt 4 SQLite 3 database driver
ii libqt4-svg 4:4.7.4-0ubuntu8 Qt 4 SVG module
ii libqt4-test 4:4.7.4-0ubuntu8 Qt 4 test module
ii libqt4-xml 4:4.7.4-0ubuntu8 Qt 4 XML module
ii libqt4-xmlpatterns 4:4.7.4-0ubuntu8 Qt 4 XML patterns module
ii pinentry-qt4 0.8.1-1ubuntu1 Qt-4-based PIN or pass-phrase entry dialog for GnuPG
ii pyqt4-dev-tools 4.8.5-0ubuntu2 Development tools for PyQt4
ii python-qt4 4.8.5-0ubuntu2 Python bindings for Qt4
ii python-qt4-dbg 4.8.5-0ubuntu2 Python bindings for Qt4 (debug extensions)
ii python-qt4-phonon 4.8.5-0ubuntu2 Python bindings for Phonon
ii python-qt4-phonon-dbg 4.8.5-0ubuntu2 Python bindings for Phonon (debug extensions)
ii qt4-demos 4:4.7.4-0ubuntu8 Qt 4 examples and demos
ii qt4-designer 4:4.7.4-0ubuntu8 graphical designer for Qt 4 applications
ii qt4-dev-tools 4:4.7.4-0ubuntu8 Qt 4 development tools
ii qt4-doc 4:4.7.4-0ubuntu8 Qt 4 API documentation
ii qt4-linguist-tools 4:4.7.4-0ubuntu8 Qt 4 Linguist tools
ii qt4-qmake 4:4.7.4-0ubuntu8 Qt 4 qmake Makefile generator tool
ii qt4-qmlviewer 4:4.7.4-0ubuntu8 Qt 4 QML viewer
ii qt4-qtconfig 4:4.7.4-0ubuntu8 Qt 4 configuration tool