Devin Asay wrote
> Do you mean all you have to do is set the filename property 
> of the image to empty, then set it to the external file 
> reference again? The dictionary ought to be updated, 
> or a note added, to alert users on how to do this.

Maybe (just maybe) in this way:

lock screen -- user do not see changes
set the filename of img id 1234 to empty
set the filename of img id 1234 to path/to/editedimage.jpg
unlock screen






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