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Re: About the overlay property `modification-hooks'

From: Eli Zaretskii
Subject: Re: About the overlay property `modification-hooks'
Date: Sun, 24 Feb 2013 05:52:16 +0200

> Date: Sun, 24 Feb 2013 11:35:55 +0800
> From: Xue Fuqiao <>
> In (info "(elisp) Overlay Properties"):
>      When called after a change, each function receives five arguments:
>      the overlay, `t', the beginning and end of the text range just
>      modified, and the length of the pre-change text replaced by that
>      range.  (For an insertion, the pre-change length is zero; for a
>      deletion, that length is the number of characters deleted, and the
>      post-change beginning and end are equal.)
> I'm perplexed about the sentence in the parentheses.  What does the
> "post-change beginning and end" mean here?  Can anybody help?  Thanks.

See the part underlined above.

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