Bug 478528 - Layer and Image previews are not color managed
Change gimp_viewable_get_[new]_preview() to return buffers of the image's and layers' colorspace, but in u8. This way layer and image previews can transform them correctly to the display profile. Note: this makes plug-ins receive thumbnail buffers in that pixel format too. Also change gimp_viewable_get_[new]_pixbuf() to always return sRGB buffers that can reasonably be put to screen directly, or put into DND buffers. This is at least more correct now.
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0ee27de4