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

Previous Next

Full log

Message #25 received at 17234 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
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 12:31:48 -0400

Stefan Monnier wrote:

> It has always been the case that `priority' could be any value.

But the only documented values were and are nil and positive integers.
I really doubt anyone was intentionally using anything else to mean "nil".

> 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".

> But ediff's bug could already be triggered in Emacs<24.4 by a package
> installing an overlay with a `priority' that's a cons cell.

Since we never (?) had any such reports, I conclude nobody did that.

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).

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.