SUMMARY IBus cannot receive the focus-out events when I switch tabs in konsole. STEPS TO REPRODUCE 1. Install libibusplatforminputcontextplugin.so in qtbase 2. Run ibus-daemon in your Plasma desktop 3. Run env QT_IM_MODULE=ibus konsole 4. Type Ctrl-Shift-t and open a new tab in konsole 5. Click another tab to switch the input focus. OBSERVED RESULT QIBusPlatformInputContext::setFocusObject() always receives non-null objects which means tabs receive focus-in events only. EXPECTED RESULT QIBusPlatformInputContext::setFocusObject() receives null objects and non-null objects which means tabs receive focus-in and focus-out events. When I change the focus between windows, E.g. konsole and kwrite, konsole can get focus-out events below. #0 QIBusPlatformInputContext::setFocusObject (this=0x55616f656200, object=0x0) at qibusplatforminputcontext.cpp:265 #1 0x00007f5745f0c79c in QGuiApplicationPrivate::_q_updateFocusObject ( this=0x55616f590dd0, object=0x0) at kernel/qguiapplication.cpp:4033 #2 0x00007f5745f06e5b in QGuiApplicationPrivate::processActivatedEvent ( e=0x55616fb383e0) at kernel/qguiapplication.cpp:2332 #3 0x00007f5745f05223 in QGuiApplicationPrivate::processWindowSystemEvent ( e=0x55616fb383e0) at kernel/qguiapplication.cpp:1860 #4 0x00007f5745eef1fb in QWindowSystemInterface::sendWindowSystemEvents ( flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1148 #5 0x00007f573495bc8e in xcbSourceDispatch (source=<optimized out>) at qxcbeventdispatcher.cpp:105 #6 0x00007f57441b094d in g_main_dispatch (context=0x7f572c005010) at ../glib/gmain.c:3309 #7 0x00007f57441b188b in g_main_context_dispatch (context=0x7f572c005010) at ../glib/gmain.c:3974 #8 0x00007f57441b1a83 in g_main_context_iterate (context=0x7f572c005010, block=1, dispatch=1, self=0x7f572c004d60) at ../glib/gmain.c:4047 #9 0x00007f57441b1b63 in g_main_context_iteration (context=0x7f572c005010, may_block=1) at ../glib/gmain.c:4108 #10 0x00007f5745b9b6d6 in QEventDispatcherGlib::processEvents ( this=0x55616f64a580, flags=...) at kernel/qeventdispatcher_glib.cpp:423 #11 0x00007f5745b4afcb in QEventLoop::exec (this=0x7ffe5122d110, flags=...) You can see object==null in the stack. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Fedora 32 (available in About System) KDE Plasma Version: 5.18.4 KDE Frameworks Version: kf5-frameworkintegration-5.68.0 Qt Version: 5.13.2 ADDITIONAL INFORMATION