[WinCairo WK1] editing/pasteboard/files-during-page-drags.html is randomly failing as "ASSERTION FAILED: ::IsWindow(m_runLoopMessageWindow)" ASSERTION FAILED: ::IsWindow(m_runLoopMessageWindow) C:\BW\WinCairo-64-bit-WKL-Debug-Build\build\Source\WTF\wtf\win\RunLoopWin.cpp(118) : WTF::RunLoop::RunLoop 1 00007FF8F7F123CB WTFCrash 2 00007FF8F7F179BD WTFCrashWithInfo 3 00007FF8F809EC0F WTF::RunLoop::RunLoop 4 00007FF8F7FB90EB WTF::RunLoop::Holder::Holder 5 00007FF8F7FB904C WTF::ThreadSpecific<WTF::RunLoop::Holder,0>::Data::Data 6 00007FF8F7FBB417 WTF::ThreadSpecific<WTF::RunLoop::Holder,0>::set 7 00007FF8F7FB9622 WTF::ThreadSpecific<WTF::RunLoop::Holder,0>::operator WTF::RunLoop::Holder * 8 00007FF8F7FB96C4 WTF::ThreadSpecific<WTF::RunLoop::Holder,0>::operator-> 9 00007FF8F7FB7403 WTF::RunLoop::current 10 00007FF8F809137F `WTF::WorkQueueBase::platformInitialize'::`2'::<lambda_1>::operator() 11 00007FF8F809172B WTF::Detail::CallableWrapper<`WTF::WorkQueueBase::platformInitialize'::`2'::<lambda_1>,void>::call 12 00007FF8F7F29EC3 WTF::Function<void __cdecl(void)>::operator() 13 00007FF8F7FC6798 WTF::Thread::entryPoint 14 00007FF8F80A0964 WTF::wtfThreadEntryPoint 15 00007FF9064B1FFA o_exp 16 00007FF9083E7974 BaseThreadInitThunk 17 00007FF9247AA271 RtlUserThreadStart 249978@main is the first crash of WinCairo-64-bit-WKL-Release-Tests. https://build.webkit.org/#/builders/60/builds/6429 249979@main is the first crash of WinCairo-64-bit-WKL-Debug-Tests. https://build.webkit.org/#/builders/32/builds/2248
I don't succeed to reproduce this assertion failure on my PC.
Windows WK1 was removed.