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Re: hi-lock and overlays

From: Tassilo Horn
Subject: Re: hi-lock and overlays
Date: Wed, 20 Jan 2010 18:19:48 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.91 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>>   - Why does hi-lock use two different styles of highlighting?  IMO, if
>>     a user does M-x highlight-regexp RET foo RET hi-yellow RET, he
>>     expects to get that highlighting even if there are other overlays,
>>     so creating an overlay (and maybe even setting a priority) is the
>>     only safe bet.
> overlays are implemented inefficiently, so if you have many of them,
> redisplay, buffer modifications, and other operations can become
> noticeably slower.

I see, but still I think that deciding between font-lock and overlays by
the value of `font-lock-fontified' is weird, and I'd vote for an
optional parameter that lets one specify the method to be used
explicitly.  What do yau think?

Ok, back to the original problem that hl-line-mode's overlay supresses
the font-lock highlighting added by hi-lock.  The cleanest solution
seems to be to decide on the usage of negative overlay priorities to
make font-lock take precedence here, and hl-line-mode's overlay would
use one.  But I don't know how feasible that is.


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