Re: Using overlay in register

[Richard Stallman]

    Thank you for reviwing and suggestion. I have used after-string.
    If the point is at the end of line, set a space to an overlay's
    `after-string' property. 

That may give inconsistent results.  What if I delete the following
newline?  Then it will no longer be at the end of the line, but the
overlay will still have a space in the `after-string' property.

    +(defun register-clear-overlay-at-point (event)
    +  "Clear the register associated with an overlay pointed by EVENT."
    +  (interactive "e")
    +  (save-excursion

Why is this feature useful?