https://bugs.kde.org/show_bug.cgi?id=389793

            Bug ID: 389793
           Summary: ASSERT: "sourceModel()->rowCount()" in file
                    /home/jkt/work/prog/trojita/src/Imap/Model/ThreadingMs
                    gListModel.cpp, line 647
           Product: trojita
           Version: git
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Core
          Assignee: trojita-b...@kde.org
          Reporter: j...@kde.org
  Target Milestone: ---

There were some network reconnects. A search was active in a random mailbox.
The msg list went blank, and upon clearing the search condition manually,
Trojita crashed:

Couldn't find out which mailbox is "cesnet.gn3.gn4-jra2-t1" when parsing a
STATUS reply
Couldn't find out which mailbox is "cesnet.project01.CzechLight" when parsing a
STATUS reply
"Current threading invalidated by changed search"
ASSERT: "sourceModel()->rowCount()" in file
/home/jkt/work/prog/trojita/src/Imap/Model/ThreadingMsgListModel.cpp, line 647
Aborted (core dumped)

(gdb) bt
#0  0x00007f680fbd221b in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007f680fbd38b1 in __GI_abort () at abort.c:89
#2  0x00007f681092e99e in qt_message_fatal (context=..., message=<synthetic
pointer>...) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/global/qlogging.cpp:1690
#3  QMessageLogger::fatal (this=this@entry=0x7ffe6ea89e20,
msg=msg@entry=0x7f6810bf3038 "ASSERT: \"%s\" in file %s, line %d") at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/global/qlogging.cpp:796
#4  0x00007f6810928c45 in qt_assert (assertion=<optimized out>, file=<optimized
out>, line=<optimized out>) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/global/qglobal.cpp:3077
#5  0x00000000005e94f4 in
Imap::Mailbox::ThreadingMsgListModel::askForThreading(unsigned int) ()
#6  0x00000000005edad5 in
Imap::Mailbox::ThreadingMsgListModel::setUserSearchingSortingPreference(QStringList
const&, Imap::Mailbox::ThreadingMsgListModel::SortCriterium, Qt::SortOrder) ()
#7  0x00007f6810b5a505 in QtPrivate::QSlotObjectBase::call (a=0x7ffe6ea8a110,
r=0x7ffe6ea8aa00, this=0x128ce40) at
../../include/QtCore/../../../qtcore-5.9.9999/src/corelib/kernel/qobject_impl.h:101
#8  QMetaObject::activate (sender=0x110f900, signalOffset=<optimized out>,
local_signal_index=<optimized out>, argv=0x7ffe6ea8a110) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qobject.cpp:3749
#9  0x00000000004899f2 in Gui::MessageListWidget::requestingSearch(QStringList
const&) ()
#10 0x00000000004ba1a4 in Gui::MessageListWidget::slotApplySearch() ()
#11 0x00007f6810b5a505 in QtPrivate::QSlotObjectBase::call (a=0x7ffe6ea8a280,
r=0x110f900, this=0x122d700) at
../../include/QtCore/../../../qtcore-5.9.9999/src/corelib/kernel/qobject_impl.h:101
#12 QMetaObject::activate (sender=sender@entry=0x122d650,
signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0,
argv=argv@entry=0x7ffe6ea8a280)
    at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qobject.cpp:3749
#13 0x00007f6810b5aaa5 in QMetaObject::activate (sender=sender@entry=0x122d650,
m=m@entry=0x7f6810d8a100 <QTimer::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffe6ea8a280)
    at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qobject.cpp:3628
#14 0x00007f6810b68e8f in QTimer::timeout (this=this@entry=0x122d650, _t1=...)
at .moc/moc_qtimer.cpp:201
#15 0x00007f6810b69434 in QTimer::timerEvent (this=0x122d650, e=<optimized
out>) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qtimer.cpp:255
#16 0x00007f6810b5b49b in QObject::event (this=0x122d650, e=<optimized out>) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qobject.cpp:1268
#17 0x00007f6811417d54 in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x122d650, e=0x7ffe6ea8a5b0)
    at
/var/tmp/portage/dev-qt/qtwidgets-5.9.9999/work/qtwidgets-5.9.9999/src/widgets/kernel/qapplication.cpp:3722
#18 0x00007f68114204a2 in QApplication::notify (this=0x7ffe6ea8a9f0,
receiver=0x122d650, e=0x7ffe6ea8a5b0) at
/var/tmp/portage/dev-qt/qtwidgets-5.9.9999/work/qtwidgets-5.9.9999/src/widgets/kernel/qapplication.cpp:3481
#19 0x00007f6810b2a078 in QCoreApplication::notifyInternal2
(receiver=0x122d650, event=event@entry=0x7ffe6ea8a5b0) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qcoreapplication.cpp:1018
#20 0x00007f6810b85cbd in QCoreApplication::sendEvent (event=0x7ffe6ea8a5b0,
receiver=<optimized out>) at
../../include/QtCore/../../../qtcore-5.9.9999/src/corelib/kernel/qcoreapplication.h:233
#21 QTimerInfoList::activateTimers (this=0x1061cb0) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qtimerinfo_unix.cpp:643
#22 0x00007f6810b8683f in timerSourceDispatch (source=<optimized out>) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qeventdispatcher_glib.cpp:182
#23 0x00007f680b18080c in g_main_dispatch (context=0x7f67fc0016f0) at
/var/tmp/portage/dev-libs/glib-2.48.2/work/glib-2.48.2/glib/gmain.c:3154
#24 g_main_context_dispatch (context=context@entry=0x7f67fc0016f0) at
/var/tmp/portage/dev-libs/glib-2.48.2/work/glib-2.48.2/glib/gmain.c:3769
#25 0x00007f680b180b18 in g_main_context_iterate
(context=context@entry=0x7f67fc0016f0, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>)
    at /var/tmp/portage/dev-libs/glib-2.48.2/work/glib-2.48.2/glib/gmain.c:3840
#26 0x00007f680b180c21 in g_main_context_iteration (context=0x7f67fc0016f0,
may_block=1) at
/var/tmp/portage/dev-libs/glib-2.48.2/work/glib-2.48.2/glib/gmain.c:3901
#27 0x00007f6810b86e9d in QEventDispatcherGlib::processEvents (this=0x107d1f0,
flags=...) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qeventdispatcher_glib.cpp:423
#28 0x00007f6810b281ba in QEventLoop::exec (this=this@entry=0x7ffe6ea8a840,
flags=..., flags@entry=...) at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qeventloop.cpp:212
#29 0x00007f6810b31d48 in QCoreApplication::exec () at
/var/tmp/portage/dev-qt/qtcore-5.9.9999/work/qtcore-5.9.9999/src/corelib/kernel/qcoreapplication.cpp:1291
#30 0x0000000000454e08 in main ()

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