315e7e04a8
When loading preview images from disk, we'd first scale them to the standard preview image size (in `icon_copy_rect()`) and then scale them again to the drawing size when eventually drawing to screen. The first scaling would happen on the CPU, which is slow, and without filtering. Now the image is stored in its original size and only scaled when drawing, which uses scaling on the GPU with mipmaps and bi-linear filtering. While a bit more blurry, the resulting image has less artifacts and represents the original image better. Keeping the images unscaled means memory footprint is bigger, we could cap the size if necessary. Noticed while working on #131871. Asset shelf previews would have more artifacts than before. See pull request for comparisons. Pull Request: https://projects.blender.org/blender/blender/pulls/133559
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