Description of problem:
It occurs when one invokes Falkon, then changes their Global Theme, then observes the source of the page, then attempts to activate word wrap. The FAF URI is https://retrace.fedoraproject.org/faf/reports/bthash/a3084c2510c46a6e5f5cec39520a021cd46827a6. Reported upstream, at https://bugs.kde.org/show_bug.cgi?id=518797#c0.

Version-Release number of selected component:
falkon-25.12.3-1.fc43

Additional info:
reporter:       libreport-2.17.15
type:           CCpp
reason:         falkon killed by SIGSEGV
journald_cursor: s=c1f108f1ef4e48808a377c0a73f168fc;i=172e9cc;b=686b7ae97f7c43e19aa43e1d5f1574a3;m=87132128d;t=64f238c1087e9;x=ae175ae8720b8691
executable:     /usr/bin/falkon
cmdline:        /usr/bin/falkon
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/app-org.kde.falkon
rootdir:        /
uid:            1000
kernel:         6.19.11-200.fc43.x86_64
package:        falkon-25.12.3-1.fc43
runlevel:       /bin/sh: line 1: runlevel: command not found
backtrace_rating: 4
crash_function: QWeakPointer<QObject>::isNull
comment:        It occurs when one invokes Falkon, then changes their Global Theme, then observes the source of the page, then attempts to activate word wrap.

Truncated backtrace:
Thread no. 0 (29 frames)
 #0 QWeakPointer<QObject>::isNull at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/tools/qsharedpointer_impl.h:616
 #1 QPointer<QStyle>::isNull at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qpointer.h:86
 #2 QPointer<QStyle>::operator bool at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qpointer.h:87
 #3 QProxyStylePrivate::ensureBaseStyle at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/styles/qproxystyle.cpp:56
 #4 QProxyStyle::baseStyle at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/styles/qproxystyle.cpp:130
 #5 ProxyStyle::name at /usr/src/debug/falkon-25.12.3-1.fc43.x86_64/src/lib/app/proxystyle.cpp:82
 #6 MainApplication::styleName at /usr/src/debug/falkon-25.12.3-1.fc43.x86_64/src/lib/app/mainapplication.cpp:572
 #7 WebScrollBarCornerWidget::paintEvent at /usr/src/debug/falkon-25.12.3-1.fc43.x86_64/src/lib/webengine/webscrollbarmanager.cpp:67
 #8 QWidget::event at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qwidget.cpp:9381
 #9 QApplicationPrivate::notify_helper at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qapplication.cpp:3305
 #10 QCoreApplication::notifyInternal2 at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1109
 #11 QCoreApplication::sendSpontaneousEvent at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1563
 #12 QWidgetPrivate::sendPaintEvent at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qwidget.cpp:5681
 #13 QWidgetPrivate::drawWidget at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qwidget.cpp:5631
 #14 QWidgetRepaintManager::paintAndFlush at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qwidgetrepaintmanager.cpp:901
 #15 QWidget::event at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qwidget.cpp:9326
 #16 QApplicationPrivate::notify_helper at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qapplication.cpp:3305
 #17 QCoreApplication::notifyInternal2 at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1109
 #18 QCoreApplication::sendEvent at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1549
 #19 QCoreApplicationPrivate::sendPostedEvents at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1904
 #20 postEventSourceDispatch at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:246
 #22 g_main_context_dispatch_unlocked at ../glib/gmain.c:4425
 #23 g_main_context_iterate_unlocked at ../glib/gmain.c:4490
 #24 g_main_context_iteration at ../glib/gmain.c:4556
 #25 QEventDispatcherGlib::processEvents at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:399
 #26 QEventLoop::exec at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/global/qflags.h:77
 #27 QCoreApplication::exec at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1452
 #28 QGuiApplication::exec at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/gui/kernel/qguiapplication.cpp:2005
 #29 QApplication::exec at /usr/src/debug/qt6-qtbase-6.10.3-1.fc43.x86_64/src/widgets/kernel/qapplication.cpp:2575