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Re: hi-lock and overlays

From: Stefan Monnier
Subject: Re: hi-lock and overlays
Date: Wed, 20 Jan 2010 10:54:47 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.91 (gnu/linux)

>   - 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.


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