Re: Patch: goto-address -vs- font-lock-mode

[Richard Stallman]

    This patch adds a new minor mode that acts like `goto-address'.
    Unlike goto-address, it uses font-lock to add properties to text in
    the buffer.  This means that changes to the buffer which add URLs or
    email address will automatically be detected.

Would it be more appropriate to use overlays for this?
You wouldn't want to copy those properties ever, and it is better
if adding them does not modify the buffer.

Is it feasible to use the font-lock mechanism to add overlays?