(lookup_image): Block input while loading the image so
that we won't get interrupted in a state where the image isn't yet set up completely. (xbm_load_image, xbm_load, xpm_load, xpm_load, lookup_rgb_color) (lookup_pixel_color, x_to_xcolors, x_from_xcolors) (x_disable_image, x_build_heuristic_mask, pbm_load, png_load) (jpeg_load, tiff_load, gif_load, gs_load): Don't block/unblock input.
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