Created attachment 103383 [details]
Button tab

The preview available in "Application Style" > "Window Decorations" > Buttons doesn't follow the current color scheme.

Also, exiting systemsettings5 or using previous cause a SEGFAULT of systemsettings.

This is the trace when launching the application in a terminal :

Plugin changed to:  "org.kde.breeze"
Calling KPluginInfo::property("X-KDE-PluginInfo-Name") is deprecated, use KPluginInfo::pluginName() in "/usr/lib/qt/plugins/org.kde.kdecoration2/breezedecoration.so" instead.
Factory:  true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
file:///usr/share/kwin/kcm_kwindecoration/Buttons.qml:42:16: Unable to assign [undefined] to QColor
file:///usr/share/kwin/kcm_kwindecoration/Buttons.qml:54:24: Unable to assign [undefined] to QColor
file:///usr/share/kwin/kcm_kwindecoration/Buttons.qml:149: ReferenceError: iconLabel is not defined
file:///usr/share/kwin/kcm_kwindecoration/Buttons.qml:197:24: Unable to assign [undefined] to QColor
Plugin changed to:  "org.kde.breeze"
Calling KPluginInfo::property("X-KDE-PluginInfo-Name") is deprecated, use KPluginInfo::pluginName() in "/usr/lib/qt/plugins/org.kde.kdecoration2/breezedecoration.so" instead.
Factory:  true
Setting  width : -8
Setting  height : -33
Setting  width : -28
Setting  height : -53
Setting  width : -8
Setting  height : -33
Setting  width : -28
Setting  height : -53
Setting  width : 332
Setting  height : 172
Setting  width : 332
Setting  height : 172
Setting  caption : "Breeze"
Setting  width : 329
Setting  width : 302
Setting  height : 139
Setting  height : 142
Setting  caption : "Breeze"
Setting  active : false
Setting  width : 299
Setting  width : 302
Setting  height : 169
Setting  height : 142
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Plugin changed to:  "org.kde.kwin.aurorae"
Calling KPluginInfo::property("X-KDE-PluginInfo-Name") is deprecated, use KPluginInfo::pluginName() in "/usr/lib/qt/plugins/org.kde.kdecoration2/breezedecoration.so" instead.
Factory:  true
Module 'org.kde.kwin.decoration' does not contain a module identifier directive - it cannot be protected from external registrations.
Setting  width : -8
Setting  height : -32
Setting  width : -8
Setting  height : -32
Setting  width : 352
Setting  height : 193
Setting  width : 352
Setting  height : 193
Setting  caption : "Plastik"
Setting  width : 342
Setting  width : 302
Setting  height : 153
Setting  height : 143
Setting  caption : "Plastik"
Setting  active : false
Setting  width : 312
Setting  width : 302
Setting  height : 183
Setting  height : 143
Plugin changed to:  "org.kde.oxygen"
Calling KPluginInfo::property("X-KDE-PluginInfo-Name") is deprecated, use KPluginInfo::pluginName() in "/usr/lib/qt/plugins/org.kde.kdecoration2/breezedecoration.so" instead.
Factory:  true
Setting  width : -8
Setting  height : -36
Setting  width : -88
Setting  height : -116
Setting  width : -8
Setting  height : -36
Setting  width : -88
Setting  height : -116
Setting  width : 272
Setting  height : 109
Setting  width : 272
Setting  height : 109
Setting  caption : "Oxygen"
Setting  width : 302
Setting  height : 139
Setting  caption : "Oxygen"
Setting  active : false
Setting  width : 302
Setting  height : 139
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
Setting  active : false
Setting  providesContextHelp : true
KCrash: Application 'systemsettings5' crashing...
KCrash: Attempting to start /usr/lib/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0
zsh: suspended (signal)  systemsettings5

And the backtrace of the segfault :

Application: System Settings (systemsettings5), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff260899c80 (LWP 12366))]

Thread 4 (Thread 0x7ff231705700 (LWP 12372)):
#0  0x00007ff25c5a148d in poll () from /usr/lib/libc.so.6
#1  0x00007ff2566d7786 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007ff2566d789c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ff25cec53eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007ff25ce6ec1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007ff25cc909f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ff25af94e75 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007ff25cc95658 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007ff2585ee454 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007ff25c5aa7df in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7ff244835700 (LWP 12369)):
#0  0x00007ff25c5a148d in poll () from /usr/lib/libc.so.6
#1  0x00007ff2566d7786 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007ff2566d789c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ff25cec53eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007ff25ce6ec1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007ff25cc909f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ff25d7de0c5 in ?? () from /usr/lib/libQt5DBus.so.5
#7  0x00007ff25cc95658 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007ff2585ee454 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007ff25c5aa7df in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7ff24cebb700 (LWP 12368)):
#0  0x00007ff25c5a148d in poll () from /usr/lib/libc.so.6
#1  0x00007ff258e718e0 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007ff258e73679 in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007ff24f41f239 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007ff25cc95658 in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007ff2585ee454 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007ff25c5aa7df in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7ff260899c80 (LWP 12366)):
[KCrash Handler]
#6  0x00007ff25c4f504f in raise () from /usr/lib/libc.so.6
#7  0x00007ff25c4f647a in abort () from /usr/lib/libc.so.6
#8  0x00007ff25c532c50 in __libc_message () from /usr/lib/libc.so.6
#9  0x00007ff25c538fe6 in malloc_printerr () from /usr/lib/libc.so.6
#10 0x00007ff25c53936c in malloc_consolidate () from /usr/lib/libc.so.6
#11 0x00007ff25c53ad2a in _int_malloc () from /usr/lib/libc.so.6
#12 0x00007ff25c53cd44 in malloc () from /usr/lib/libc.so.6
#13 0x00007ff25cc9688c in QArrayData::allocate(unsigned long, unsigned long, unsigned long, QFlags<QArrayData::AllocationOption>) () from /usr/lib/libQt5Core.so.5
#14 0x00007ff25ad5ad2e in ?? () from /usr/lib/libQt5Qml.so.5
#15 0x00007ff25ad5ae74 in ?? () from /usr/lib/libQt5Qml.so.5
#16 0x00007ff25ae556e0 in QV4::WeakValue::free() () from /usr/lib/libQt5Qml.so.5
#17 0x00007ff25aef5327 in QQmlData::destroyed(QObject*) () from /usr/lib/libQt5Qml.so.5
#18 0x00007ff25cea3e5e in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#19 0x00007ff25b3a0956 in ?? () from /usr/lib/libQt5Quick.so.5
#20 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#21 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#22 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#23 0x00007ff25b4a30b6 in ?? () from /usr/lib/libQt5Quick.so.5
#24 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#25 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#26 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#27 0x00007ff25b4a35d6 in ?? () from /usr/lib/libQt5Quick.so.5
#28 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#29 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#30 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#31 0x00007ff25b4a2dce in ?? () from /usr/lib/libQt5Quick.so.5
#32 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#33 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#34 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#35 0x00007ff25b4a30b6 in ?? () from /usr/lib/libQt5Quick.so.5
#36 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#37 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#38 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#39 0x00007ff25b4a30b6 in ?? () from /usr/lib/libQt5Quick.so.5
#40 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#41 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#42 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#43 0x00007ff25b4a316e in ?? () from /usr/lib/libQt5Quick.so.5
#44 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#45 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#46 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#47 0x00007ff25b4a316e in ?? () from /usr/lib/libQt5Quick.so.5
#48 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#49 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#50 0x00007ff25b4893df in QQuickItem::~QQuickItem() () from /usr/lib/libQt5Quick.so.5
#51 0x00007ff25b4a30b6 in ?? () from /usr/lib/libQt5Quick.so.5
#52 0x00007ff25ce9a791 in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#53 0x00007ff25cea40ef in QObject::~QObject() () from /usr/lib/libQt5Core.so.5
#54 0x00007ff231da1eb9 in ?? () from /usr/lib/qt/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#55 0x00007ff25ce9cf60 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#56 0x00007ff25ea0234c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#57 0x00007ff25ea09b61 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#58 0x00007ff25ce707c0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#59 0x00007ff25ce72f4d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#60 0x00007ff25cec4fc3 in ?? () from /usr/lib/libQt5Core.so.5
#61 0x00007ff2566d7587 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#62 0x00007ff2566d77f0 in ?? () from /usr/lib/libglib-2.0.so.0
#63 0x00007ff2566d789c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#64 0x00007ff25cec53cf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#65 0x00007ff25ce6ec1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#66 0x00007ff25ce77164 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#67 0x000000000040c240 in ?? ()
#68 0x00007ff25c4e2291 in __libc_start_main () from /usr/lib/libc.so.6
#69 0x000000000040c2ba in _start ()