GNU bug report logs - #15312
Info (point-entered, point-left): Doc incomplete, hence incorrect

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Message #47 received at 15312 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 15312 <at> debbugs.gnu.org, kjambunathan <at> gmail.com
Subject: Re: bug#15312: Info (point-entered, point-left): Doc incomplete,
 hence incorrect
Date: Fri, 13 Sep 2013 11:15:10 -0400

> Sorry, I don't understand what you are saying about the original issue
> with point-entered/left.  Are you saying that the code works
> correctly, or are you saying it has a bug?

That the code that uses the `point-entered/left' property (just like
the code that uses the other mentioned properties like `display',
`mouse-face', ...) considers runs of characters with the same property
value as belonging together; which means that the text-property is used
to specify a kind of interval.

Clearly, this disagrees with:

    ,----  (info "(elisp) Not Intervals")
    | "What are the properties of this character?"  So we have decided these
    | are the only questions that make sense; we have not implemented asking
    | questions about where intervals start or end.
    `----

And actually the above text is incorrect/incomplete in the sense that
next-single-property-change clearly implements a functionality that lets
you "ask questions about where intervals start or end".


        Stefan

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