45f68909d7
A few bugs in that area were introduced by #8391. Upscaling is supposed to perform the final blending if needed, but it didn't. Transparency/blending is only supported by the bilinear upscaler, which is automatically selected in that case. The upscaling pass itself may include a final `RCAS` pass for sharpening, in that case, blending must be performed then. So we added the logic for that. Fixes #9061