Fix crash when minimising Unreal engine games. #77
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When in fullscreen and minimising in UT it recreates the d3d9 device and this happens during the window proc and calling
ShowWindowappears to trigger that. TheD3D9SwapChainExobjectwindowDatawas pointing to becomes invalid and causes a crash. My solution here is just to grab it again as at the start of this function. Not sure if there's a better way you might want to fix it.