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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: efficiently viewing Unix timestamps as dates
Date: Thu, 21 Apr 2011 17:20:58 -0300
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SM> The issue is to not remove the display property placed on *other*
SM> chunks of text.
> The package only applies the display property to text it matches.

Yes, but you do want to remove that property at some point.
Using font-lock-extra-managed-props is asking font-lock to take complete
control of the property (i.e. it causes font-lock-fontify-region to
start by erasing the `display' property over the whole fontified region)
so if the display property is set by a package that doesn't use
font-lock, that will be lost.


        Stefan