SDL_UnionRect: If both rects are empty, zero out the result struct.
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@ -148,6 +148,7 @@ SDL_UnionRect(const SDL_Rect * A, const SDL_Rect * B, SDL_Rect * result)
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if (SDL_RectEmpty(A)) {
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if (SDL_RectEmpty(B)) {
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/* A and B empty */
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SDL_zerop(result);
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return;
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} else {
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/* A empty, B not empty */
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