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bug#4911: mouse-face property should merge face attributes, not replace
From: |
Drew Adams |
Subject: |
bug#4911: mouse-face property should merge face attributes, not replace |
Date: |
Sun, 26 Apr 2020 10:22:09 -0700 (PDT) |
> >> But to some extent it makes sense, since that's how links behave on
> >> the web (merging faces), so it's hart to fault users for having the
> >> same expectation in Emacs.
> >
> > Really? A mouseover action over a link in a web browser
> > doesn't change the link appearance, by default.
>
> Most websites do, I think (I just checked Google, the New York Times,
> and gnu.org), but you're right that the default style sheet doesn't
> include a face change..
I don't think I see that on nytimes.com or google.com.
I do see a mouseover "face" change on both, on inline
links in text, but what I see is all or nothing. For
NYT, for example, a link is shown underlined, and
mouseover removes the underline - IOW, two different
"faces", and mouseover uses the same face for all of
the link text.
I don't see examples of link text that has (the
equivalent of) multiple faces, so I can't see what
happens with mouseover on such links.
Do you have an example of a link on some such site,
where the link text uses multiple "faces" and
mouseover preserves those faces while perhaps adding
or removing some "face attributes" across all of them?
> > The one case where I might want something like what
> > you propose (or maybe exactly like it, depending on
> > just what it is), would be when mouseover essentially
> > underlines (or overlines or otherwise doesn't
> > obscure) the text. In that case, I can see a value
> > to continuing to show the foreground colors of the
> > underlined text - if that's realizable.
>
> Yes yes yes! We are in violent agreement here :)
I thought so. But probably "more or less", and not
violently. ;-)
> > > Why is that helpful?
> >
> > It can perhaps be easier to see the extent of the
> > link? Easier to notice the link? Dunno.
>
> With the change of background, it's actually quite readable.
I think it can depend on the background, and how it
interacts with the default/frame face and with the
faces used in the link text. You may be right that
in general most mouseover backgrounds would not be
problematic; dunno.
> > Anyway, I agree that it's helpful to keep face
> > highlighting is some cases - in particular when,
> > say, an entire line of code is highlighted.
> > The effect of, say, `hl-line-mode' is what I
> > prefer in a case like that - and yes, that's
> > merging. Similarly, for the region. I think
> > it's less likely to be useful for links (i.e.,
> > for mouseover). But I could be wrong.
>
> Yup, I feel just the same about hl-line-mode and the region. I find
> the effect of foreground colors being reset when the background changes
> due to hovering quite distracting, but I agree there's personal taste
> involved.
The question is really about links (mouseover).
> > It's fine to provide a way (some other way - e.g.
> > via a variable or another property or whatever)
> > to have mouseover merge a face instead of imposing
> > it.
>
> Yes, I think all your suggestions are good approaches.
It would be good to try a patch, in some context where
there is already lots of use of different faces. One
such context is the use of font-lock faces, but in most
such uses there isn't much predefined use of links.
> Thanks again for your input,
And thank you for the suggestion/bug report, and
attention to providing the new feature only as an
option/alternative.
(BTW, why doesn't the bug # appear in the subject line?)