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Re: address@hidden: mixed faces of invisibility ellipses]

From: Kim F. Storm
Subject: Re: address@hidden: mixed faces of invisibility ellipses]
Date: Tue, 19 Apr 2005 14:20:20 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> I have installed changes so that the ellipsis are now shown in the
>> same face as the preceding text, as that will probably be TRT for most
>> applications.
> Thanks for fixing this "longstanding" bug.
>> An alternative was to use the face of the first character of the
>> invisible text, but that looked really ugly for the things I tried.
> I'd generally be happy with the `default' face.  I think inheriting the face
> of the preceding char or of the next char doesn't make much sense.  At least
> not in outline-minor-mode as I use it (the hidden text is a piece of
> font-locked code, so the face you get for the ellipsis is pretty
> arbitrary).  I think the only case where inheriting a face might make sense
> is when that face is applied to the whole invisible text (and thus doesn't
> just belong to that text but to the whole region).

Makes sense, but not that easy to do.

What about this heuristic:


is shown as


To determine the face for ..., we compare the face of the 
last visible char ']' and first invisible char '['.
If they have the same face, use that common face for the ellipsis.

Otherwise, use the default face for the ellipsis.

>> Perhaps it would make sense to have an "ellipsis-face" property that
>> could be placed on the invisible text to override the face used
>> for the ellipsis.  That would be a fairly trivial change.
> I don't know about an ellipsis-face property, but when the text is made
> invisible with an overlay, it would make a lot of sense for the overlay's
> `face' property to determine the face of the ellipsis.  It would be even
> better if the `mouse-face', `keymap', and `help-echo' properties of the
> overlays were also "applied" to the ellipsis, so we could make ellipsis
> clickable and self-describing.

Interesting idea, but non-trivial to do.  Post-release stuff...

Kim F. Storm <address@hidden> http://www.cua.dk

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