get-filename in image-snip%

Returns the name of the currently loaded, non-inlined file, or #f if a file is not loaded or if a file was loaded with inlining (the default).

• (send an-image-snip get-filename relative-path) -> path or #f
   relative-path = #f : boxed boolean or #f

  The relative-path box is filled with #t if the loaded file's path is relative to the owning editor's path, unless relative-path is #f.