Selecting a transition and deleting it causes a crash: ``` ASSERT: "m_compoPos.count(old_position) > 0" in file /home/farid/dev/invent/kdenlive/src/timeline2/model/trackmodel.cpp, line 1458 Thread 1 "kdenlive" received signal SIGABRT, Aborted. 0x00007ffff0e9981c in ?? () from /usr/lib/libc.so.6 (gdb) bt full #0 0x00007ffff0e9981c in ?? () from /usr/lib/libc.so.6 No symbol table info available. #1 0x00007ffff0e3e150 in raise () from /usr/lib/libc.so.6 No symbol table info available. #2 0x00007ffff0e2567d in abort () from /usr/lib/libc.so.6 No symbol table info available. #3 0x00007ffff16968e4 in ?? () from /usr/lib/libQt6Core.so.6 No symbol table info available. #4 0x00007ffff169771d in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/libQt6Core.so.6 No symbol table info available. #5 0x00007ffff1694b6c in qt_assert(char const*, char const*, int) () from /usr/lib/libQt6Core.so.6 No symbol table info available. #6 0x0000555555a1c4d8 in TrackModel::requestCompositionDeletion (this=0x55557ed9e580, compoId=94, updateView=true, finalMove=true, undo=..., redo=..., finalDeletion=true) at /home/farid/dev/invent/kdenlive/src/timeline2/model/trackmodel.cpp:1458 locker = {q_val = 93825688790689} old_composition = std::shared_ptr<CompositionModel> (use count 9, weak count 1) = {get() = 0x555581b2c3f0} old_position = 23896 operation = {<std::_Maybe_unary_or_binary_function<bool>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x7fffffff9f70, _M_const_object = 0x7fffffff9f70, _M_function_pointer = 0x7fffffff9f70, _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x7fffffff9f70, this adjustment 140737488331248}, _M_pod_data = "p\237\377\377\377\177\000\000\360\241\377\377\377\177\000"}, _M_manager = 0x7fffffff9f50}, _M_invoker = 0x5555558afc95 <std::__shared_ptr_access<TrackModel, (__gnu_cxx::_Lock_policy)2, false, false>::_M_get() const+21>} #7 0x000055555594c3ef in TimelineModel::requestCompositionDeletion (this=0x5555773b64c0, compositionId=94, undo=..., redo=...) at /home/farid/dev/invent/kdenlive/src/timeline2/model/timelinemodel.cpp:2785 res = 255 trackId = 25 operation = {<std::_Maybe_unary_or_binary_function<bool>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x5555773b65c8, _M_const_object = 0x5555773b65c8, _M_function_pointer = 0x5555773b65c8, _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x5555773b65c8, this adjustment 94}, _M_pod_data = "\310e;wUU\000\000^\000\000\000\000\000\000"}, _M_manager = 0x3}, _M_invoker = 0x9106f80864b21e00} composition = std::shared_ptr<CompositionModel> (use count 94, weak count -1) = {get() = 0x5555773b65b8} new_in = 21845 --Type <RET> for more, q to quit, c to continue without paging-- new_out = 2000381368 reverse = {<std::_Maybe_unary_or_binary_function<bool>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x7fffffffa160, _M_const_object = 0x7fffffffa160, _M_function_pointer = 0x7fffffffa160, _M_member_pointer = (void (std::_Undefined_class::*)(std::_Undefined_class * const)) 0x7fffffffa160, this adjustment 140737488331120}, _M_pod_data = "`\241\377\377\377\177\000\000p\241\377\377\377\177\000"}, _M_manager = 0x555575a71fe0}, _M_invoker = 0x7fffffffa214} #8 0x000055555594b389 in TimelineModel::requestItemDeletion (this=0x5555773b64c0, itemId=94, undo=..., redo=..., logUndo=true) at /home/farid/dev/invent/kdenlive/src/timeline2/model/timelinemodel.cpp:2602 locker = {q_val = 93825560962665} #9 0x000055555594cfb5 in TimelineModel::requestItemDeletion (this=0x5555773b64c0, itemId=94, logUndo=true) at /home/farid/dev/invent/kdenlive/src/timeline2/model/timelinemodel.cpp:2645 locker = {q_val = 93825560962665} actionLabel = {d = {d = 0x5555818504e0, ptr = 0x5555818504f0 u"Delete Composition", size = 18}, static _empty = 0 u'\000'} singleSelectOperation = false undo = {<std::_Maybe_unary_or_binary_function<bool>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x0, _M_const_object = 0x0, _M_function_pointer = 0x0, _M_member_pointer = NULL}, _M_pod_data = '\000' <repeats 15 times>}, _M_manager = 0x5555559998c0 <std::_Function_handler<bool (), TimelineModel::requestItemDeletion(int, bool)::$_0>::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation)>}, _M_invoker = 0x555555999890 <std::_Function_handler<bool (), TimelineModel::requestItemDeletion(int, bool)::$_0>::_M_invoke(std::_Any_data const&)>} redo = {<std::_Maybe_unary_or_binary_function<bool>> = {<No data fields>}, <std::_Function_base> = {static _M_max_size = 16, static _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x0, _M_const_object = 0x0, _M_function_pointer = 0x0, _M_member_pointer = NULL}, _M_pod_data = '\000' <repeats 15 times>}, _M_manager = 0x555555999bc0 <std::_Function_handler<bool (), TimelineModel::requestItemDeletion(int, bool)::$_1>::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation)>}, _M_invoker = 0x555555999b90 <std::_Function_handler<bool (), TimelineModel::requestItemDeletion(int, bool)::$_1>::_M_invoke(std::_Any_data const&)>} res = true #10 0x0000555555a64f0d in TimelineController::deleteSelectedClips (this=0x55557f11e2e0) at /home/farid/dev/invent/kdenlive/src/timeline2/view/timelinecontroller.cpp:801 sel = std::unordered_set with 1 element = {[0] = 94} trackIds = std::unordered_set with 1 element = {[0] = 25} #11 0x0000555555b7427b in MainWindow::slotDeleteItem (this=0x5555577eb060) at /home/farid/dev/invent/kdenlive/src/mainwindow.cpp:3057 widget = 0x5555577eb060 --Type <RET> for more, q to quit, c to continue without paging-- #12 0x0000555555c634de in MainWindow::qt_static_metacall (_o=0x5555577eb060, _c=QMetaObject::InvokeMetaMethod, _id=66, _a=0x7fffffffad40) at src/kdenliveLib_autogen/EWIEGA46WW/moc_mainwindow.cpp:1089 _t = 0x5555577eb060 #13 0x00007ffff17f0a59 in ?? () from /usr/lib/libQt6Core.so.6 No symbol table info available. #14 0x00007ffff505d7ae in QAction::activate(QAction::ActionEvent) () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #15 0x00007ffff5060119 in QAction::event(QEvent*) () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #16 0x00007ffff550411f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt6Widgets.so.6 No symbol table info available. #17 0x00007ffff1783658 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt6Core.so.6 No symbol table info available. #18 0x00007ffff507768c in QShortcutMap::dispatchEvent(QKeyEvent*) () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #19 0x00007ffff4c308f6 in QWindowSystemInterface::handleShortcutEvent(QWindow*, unsigned long, int, QFlags<Qt::KeyboardModifier>, unsigned int, unsigned int, unsigned int, QString const&, bool, unsigned short) () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #20 0x00007ffff4bb37e2 in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #21 0x00007ffff4c3384c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #22 0x00007ffff5183524 in ?? () from /usr/lib/libQt6Gui.so.6 No symbol table info available. #23 0x00007fffee8febfd in ?? () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #24 0x00007fffee900e57 in ?? () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #25 0x00007fffee900fe5 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #26 0x00007ffff1a9d0b2 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt6Core.so.6 No symbol table info available. --Type <RET> for more, q to quit, c to continue without paging--c #27 0x00007ffff1791983 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt6Core.so.6 No symbol table info available. #28 0x00007ffff1786eaa in QCoreApplication::exec() () from /usr/lib/libQt6Core.so.6 No symbol table info available. #29 0x0000555555745868 in main (argc=1, argv=0x7fffffffd7e8) at /home/farid/dev/invent/kdenlive/src/main.cpp:571 result = 0 app = {<QApplication> = {<No data fields>}, url = {d = 0x0}, static _vtable$ = <optimized out>} packageType = Unknown packageName = {d = {d = 0x0, ptr = 0x0, size = 0}, static _empty = 0 u'\000'} otherText = {d = {d = 0x5555574cd4b0, ptr = 0x5555574cd4c0 u"Please report bugs to <a href=\"https://bugs.kde.org/enter_bug.cgi?product=kdenlive\">https://bugs.kde.org/</a>", size = 109}, static _empty = 0 u'\000'} aboutData = <incomplete type> parser = <incomplete type> mltPathOption = <incomplete type> mltLogLevelOption = <incomplete type> clipsOption = <incomplete type> renderOption = <incomplete type> presetOption = <incomplete type> exitOption = <incomplete type> disableWelcome = <incomplete type> debugOption = <incomplete type> saveDebugOption = <incomplete type> renderUrl = {d = 0x0} presetName = {d = {d = 0x0, ptr = 0x0, size = 0}, static _empty = 0 u'\000'} clipsToLoad = {<QListSpecialMethods<QString>> = {<QListSpecialMethodsBase<QString>> = {<No data fields>}, <No data fields>}, d = {d = 0x0, ptr = 0x0, size = 0}} programDBusService = <incomplete type> ```