Ability to update an imported image (if it has changed since being imported).

I think it may be useful to have the ability to refresh/update images that have been imported but edited since. I guess that updating periodically, automatically would be pretty intensive so perhaps a menu button that forces the update (rather than having to close & reload Inkscape).

Here's an example: I import an image to be the header of a website but I notice something that should be edited out, so I load up the gimp, do my editing, save it and then click 'refresh' in Inkscape. The image is then updated to the current version.