RE: patch for next-error highlighting

[Drew Adams]

> The name `until-move' sounds like it means the overlay gets 
> deleted when the user issues a move command (C-n, C-f ...).
> 
> Something like `persistent' seems more clear.

I'm OK with whatever name you want.

FWIW, the rationale for `until-move' is that it is consistent with its tag, and
the set of tags is consistent. Each tag describes when the current locus is
highlighted/unhighlighted.

IOW, it is not about the overlay being persistent; it is about the
(un)highlighting of the current locus, whether and when that happens.

These are the descriptions I sent:

(number :tag "Highlight locus for specified time")
(const :tag  "Highlight locus until move"  until-move)
(const :tag  "Highlight locus until move or next command"  t)
(const :tag  "Do not highlight locus"  nil)
(const :tag  "Indicate locus using fringe arrow"  fringe-arrow))