GNU bug report logs - #17234
24.3.50; overlay priority : cons cells make an error in ediff

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Package: emacs;

Reported by: Nicolas Richard <theonewiththeevillook <at> yahoo.fr>

Date: Thu, 10 Apr 2014 09:38:02 UTC

Severity: important

Found in version 24.3.50

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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Message #31 received at 17234 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 17234 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#17234: 24.3.50;
 overlay priority : cons cells make an error in ediff
Date: Fri, 11 Apr 2014 16:06:08 -0400

>> Any non-number value was treated as nil by the display engine, whereas
>> now some cons values are treated as something else.
> So even if your previous point was correct, it's still an incompatible
> change. A cons cell can no longer be used to mean "no explicit priority".

Indeed.  Tho as you said:

  I really doubt anyone was intentionally using anything else to mean "nil".

So I think we're safe on this side of the backward incompatibility.

> But I imagine ediff was not the only package trying to get the priority
> of an overlay and do something with the answer (however misguided you
> think that might be).

Hard to tell.  Not sure what we can do about it, tho.


        Stefan
This bug report was last modified 11 years and 116 days ago.

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