Currently, when SVG image is loaded with `svg_load` it first examines :file value and only if :file is missing it looks for :data, using current buffer's filename (if any) as base_uri
Would not it be better to check for :data first and if present, then use :file as value for base_uri? Falling back to current buffer filename in case :file is missing
Unfortunately embedding raster images into svg with base64 encoding, using `svg-embed` is slow.
Thanks