A bug of SDL 1.3

I found a bug of SDL1.3 in a Direct3D backend.

Please see main.c.
This is a simple program that “test.bmp” moves about in screen.
In the main funtion, it calls
"SDL_putenv(“SDL_VIDEO_RENDERER=xxx”)".
If xxx is gdi or opengl, it does fine.
But xxx is d3d, the result is strange.

Thanks.

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