Fix flash of white at window edge while resizing on Windows. #915
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On Windows 7 when resizing there are flashes of white background, because the content resize lags behind the window resize. With this change the background coloring task is delegated to druid, which it already does.
This might also have an effect on #914 although given that the initial app opening flash is harder to reproduce, it will take time to find out whether that is solved.