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bug#15668: 24.3.50; No font lock on active region


From: Eli Zaretskii
Subject: bug#15668: 24.3.50; No font lock on active region
Date: Tue, 22 Oct 2013 19:28:15 +0300

> From: Jan Djärv <address@hidden>
> Date: Tue, 22 Oct 2013 18:14:03 +0200
> Cc: address@hidden,
>  address@hidden
> 
> Hello.
> 
> 21 okt 2013 kl. 21:06 skrev Eli Zaretskii <address@hidden>:
> 
> >> From: Jan Djärv <address@hidden>
> >> Date: Mon, 21 Oct 2013 20:47:25 +0200
> >> Cc: Darren Hoo <address@hidden>,
> >> address@hidden
> >> 
> >> It would be nice if one could define a face with a foreground color to be 
> >> used when foreground and background otherwise are to similar.
> > 
> > Sounds like a simple enough extension to defface.
> 
> Well, yes, but I envisioned that querying the face for the foreground would 
> automatically give the "fallback" foreground when the background is close to 
> the foreground that would otherwise be used.

That's what I had in mind, yes.

> I think the calculation of close and maybe handling face inheritance is a bit 
> tricky.

Some distance in the RGB space might fit the former.  I'm quite sure
color comparison is something for which algorithms are readily
available.





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