Crash resizing Cascade window

Crash occurs when the user quickly resizes the Cascade window.

I was able to reproduce this regularly last week, but I'm not able to do so now.

This is related to [Link Removed].

1. Create a new blank project and open it.
2. Create a new particle system asset.
3. Open it in Cascade.
4. If it's not already, resize the Cascade window vertically to the point where you can't see the viewport.
5. Quickly expand the window vertically.
6. If no crash occurs, repeat the previous two steps.

RESULT
Crash.

Fatal error: [Link Removed] [Line: 181] Unreal Engine is exiting due to D3D device being lost. (Error: 0x887A0006 - 'HUNG')

UE4Editor_D3D11RHI!TerminateOnDeviceRemoved() d3d11util.cpp:191
UE4Editor_D3D11RHI!VerifyD3D11Result() d3d11util.cpp:230
UE4Editor_D3D11RHI!FD3D11Viewport::PresentChecked() d3d11viewport.cpp:290
UE4Editor_D3D11RHI!FD3D11Viewport::Present() d3d11viewport.cpp:473
UE4Editor_D3D11RHI!FD3D11DynamicRHI::RHIEndDrawingViewport() d3d11viewport.cpp:592
UE4Editor_RHI!FRHICommandList::EndDrawingViewport() rhicommandlist.cpp:1388
UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindow_RenderThread() slaterhirenderer.cpp:859
UE4Editor_SlateRHIRenderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FSlateRHIRenderer::DrawWindows_Private'::`29'::SlateDrawWindowsCommandName,<lambda_43e86ee7c51f39979e9a39d40b280024> > >::ExecuteTask() taskgraphinterfaces.h:784
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() taskgraph.cpp:650
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() taskgraph.cpp:559
UE4Editor_RenderCore!RenderingThreadMain() renderingthread.cpp:328
UE4Editor_RenderCore!FRenderingThread::Run() renderingthread.cpp:462
UE4Editor_Core!FRunnableThreadWin::Run() windowsrunnablethread.cpp:76