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When Sixel images are rendered, they're automatically scaled to match the 10x20 cell size of the original hardware terminals. If this requires the image to be scaled down, the default GDI stretching mode can produce ugly visual artefacts, particularly for color images. This PR changes the stretching mode to `COLORONCOLOR`, which looks considerably better, but without impacting performance. The initial Sixel implementation was added in PR #17421. ## Validation Steps Performed I've tested with a number of different images using a small font size to trigger the downscaling, and I think the results are generally better, although simple black on white images are still better with the default mode (i.e. `BLACKONWHITE`), which is understandable. I've also checked the performance with a variation of the [sixel-bench] test, and confirmed that the new mode is no worse than the default. [sixel-bench]: https://github.com/jerch/sixel-bench