SUMMARY

STEPS TO REPRODUCE
1. kcmshell5 colors
2. Choose a different colour and apply
3. Boom

OBSERVED RESULT

#0  0x00007f9eed99b755 in raise () at /usr/lib/libc.so.6
#1  0x00007f9eed98691a in abort () at /usr/lib/libc.so.6
#2  0x00007f9eee0661f4 in qt_message_fatal(QtMsgType, QMessageLogContext const&, QString const&) (context=..., message=...) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/global/qlogging.cpp:1907
#3  0x00007f9eee066e65 in QMessageLogger::fatal(char const*, ...) const (this=this@entry=0x7ffdf4720c20, msg=msg@entry=0x7f9eee371210 "ASSERT: \"%s\" in file %s, line %d") at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/global/qlogging.cpp:888
#4  0x00007f9eee05f912 in qt_assert(char const*, char const*, int) (assertion=<optimized out>, file=<optimized out>, line=<optimized out>) at ../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/global/qlogging.h:91
#5  0x00007f9eef9084c1 in KWayland::Client::Seat::createPointer(QObject*) (this=0x55d7393cd4a0, parent=0x55d7384a9bc0) at /home/apol/devel/frameworks/kwayland/src/client/seat.cpp:199
#6  0x00007f9ee780e062 in Breeze::WindowManager::waylandHasPointerChanged(bool) (this=0x55d7384a9bc0, hasPointer=true) at /home/apol/devel/frameworks/breeze/kstyle/breezewindowmanager.cpp:289
#7  0x00007f9ee7812a5b in QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<bool>, void, void (Breeze::WindowManager::*)(bool)>::call(void (Breeze::WindowManager::*)(bool), Breeze::WindowManager*, void**) (f=
    (void (Breeze::WindowManager::*)(Breeze::WindowManager * const, bool)) 0x7f9ee780dfe0 <Breeze::WindowManager::waylandHasPointerChanged(bool)>, o=0x55d7384a9bc0, arg=0x7f9ed800f2e0) at /home/apol/devel/kde5/include/QtCore/qobjectdefs_impl.h:152
#8  0x00007f9ee78129b3 in QtPrivate::FunctionPointer<void (Breeze::WindowManager::*)(bool)>::call<QtPrivate::List<bool>, void>(void (Breeze::WindowManager::*)(bool), Breeze::WindowManager*, void**) (f=
    (void (Breeze::WindowManager::*)(Breeze::WindowManager * const, bool)) 0x7f9ee780dfe0 <Breeze::WindowManager::waylandHasPointerChanged(bool)>, o=0x55d7384a9bc0, arg=0x7f9ed800f2e0) at /home/apol/devel/kde5/include/QtCore/qobjectdefs_impl.h:185
#9  0x00007f9ee78128d6 in QtPrivate::QSlotObject<void (Breeze::WindowManager::*)(bool), QtPrivate::List<bool>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0x55d7384f5e10, r=0x55d7384a9bc0, a=0x7f9ed800f2e0, ret=0x0)
    at /home/apol/devel/kde5/include/QtCore/qobjectdefs_impl.h:414
#10 0x00007f9eee2a2939 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=<optimized out>, r=0x55d7384a9bc0, this=<optimized out>) at ../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:394
#11 0x00007f9eee2a2939 in QMetaCallEvent::placeMetaCall(QObject*) (this=0x7f9ed800b0f0, object=0x55d7384a9bc0) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qobject.cpp:518
#12 0x00007f9eee2a91b9 in QObject::event(QEvent*) (this=0x55d7384a9bc0, e=<optimized out>) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qobject.cpp:1260
#13 0x00007f9eeecaa07b in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x55d7384985e0, receiver=receiver@entry=0x55d7384a9bc0, e=e@entry=0x7f9ed800b0f0) at /home/apol/devel/frameworks/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3703
#14 0x00007f9eeecb39c8 in QApplication::notify(QObject*, QEvent*) (this=0x7ffdf4721c60, receiver=0x55d7384a9bc0, e=0x7f9ed800b0f0) at /home/apol/devel/frameworks/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3059
#15 0x00007f9eee270ac3 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x55d7384a9bc0, event=0x7f9ed800b0f0) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1095
#16 0x00007f9eee270d24 in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=receiver@entry=0x55d7384a9bc0, event=event@entry=0x7f9ed800b0f0) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1490
#17 0x00007f9eee2745ef in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=0x0, event_type=0, data=0x55d7384874e0) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1840
#18 0x00007f9eee2d71cb in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55d7384a6b50, flags=...) at /home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:466
#19 0x00007f9ee838527f in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at /home/apol/devel/frameworks/qt5/qtbase/src/platformsupport/eventdispatchers/qunixeventdispatcher.cpp:63
#20 0x00007f9eee26e6a7 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffdf4721400, flags=..., flags@entry=...) at /usr/include/c++/9.1.0/bits/atomic_base.h:734
#21 0x00007f9eee26eaff in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffdf4721400, flags=flags@entry=...) at ../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/global/qflags.h:122
#22 0x00007f9eee278f10 in QCoreApplication::exec() () at ../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/global/qflags.h:120
#23 0x00007f9eee65d834 in QGuiApplication::exec() () at /home/apol/devel/frameworks/qt5/qtbase/src/gui/kernel/qguiapplication.cpp:1788
#24 0x00007f9eeeca9fe9 in QApplication::exec() () at /home/apol/devel/frameworks/qt5/qtbase/src/widgets/kernel/qapplication.cpp:2859
#25 0x000055d736468cda in main(int, char**) (argc=4, argv=0x7ffdf4721e78) at /home/apol/devel/frameworks/kwin/main_wayland.cpp:676


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION