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From: Richard Stallman <rms@gnu.org>
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Subject: Re: variable width space display property value has no effect in
 empty	overlay
Date: Sat, 14 Jun 2003 08:28:00 -0400
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    An overlay spanning 0 characters with a display property set to an
    image displays the image (when the move-on-insertion properties of the
    overlay ends are equal, it serves more or less as a visible marker).

I wasn't aware of that.

    It does not seem consistent if other display properties intended to
    mask the underlying character range (even if empty) do not behave
    likewise.

I agree, it seems inconsistent, and perhaps it ought to be changed.
Finding someone who can change it and wants to change it is a harder
issue.  Do we have anyone who understands that code?