Re: address@hidden: display problem after renaming open image files]

[Richard Stallman]

    > $ cp ../pic.png pic1.png
    > open the first file
    > rename pic1.png to pic3.png:
    > revisit the first file
    > The image shows up as a small square rather than the real image.

    This is because the underlying image file, pic1.png, is gone.  I think
    this is not worth fixing at this point.

It is clearly a bug, and we should try to fix it.
What causes this bug?  What data structure still refers
to the old file name, and has not been updated to the new one?