plug-ins: in file-psd, use SRC_OVER and RGB_PERCEPTUAL for all layers
Use SRC_OVER, instead of SRC_ATOP, as the composite mode for all layers (or use AUTO, when it results in SRC_OVER), to match Photoshop's behavior. Use RGB_PERCEPTUAL as the blend and composite space, instead of AUTO, whose interpretation depends on the specific layer mode, to match Photoshop's behavior for RGB images. Use NORMAL mode, instead of NORMAL_LEGACY, with the above properties, for normal layers, for consistency with the other layer modes, which don't (and, indeed, can't) use the legacy modes.
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