Fix the "blank window flash" problem on windows. #386
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See: rust-windowing/winit#1290
Fix explained here: https://stackoverflow.com/a/74019785
Cloak attribute documentation: https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
TL;DR: Set the
Cloakwindow attribute on creation, hiding the window, then unset it once the first draw is complete.Cloakdiffers fromVisiblein that the window will still be composited, allowing said draw to actually work.