GNU bug report logs - #6130
23.1; artist-mode spray-can malfunction

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Message #38 received at 6130 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 6130 <at> debbugs.gnu.org, busk <busk <at> lysator.liu.se>,
 Daniel Koning <dk <at> danielkoning.com>
Subject: Re: bug#6130: 23.1; artist-mode spray-can malfunction
Date: Thu, 22 Jan 2015 18:08:36 -0500

> Daniel in his first post wrote that
>   I also went ahead and searched the lisp/ tree for other places that
>   looked risky -- that is, where a position object was assumed to hold a
>   window in a context where there was no such guarantee. Nothing jumped
>   out at me, but there could be any number of issues with third-party
>   code.
> so I think this has been taken care of already.

To be honest, I don't know what that means.  IIUC it means that most of
the code doesn't care if posn-window sometimes returns a frame.

It's wrong for posn-window to return a frame.  So are there callers that
actually rely on this wrong behavior?  Are there callers where returning
nil instead of a frame would be a problem?  Are there callers where
signaling an error instead of returning a frame would be a problem?

> This would backfire for people who would like `posn-window' to always
> return the first element of a position.

That's OK, in the sense that we don't care if people's feelings
are hurt.  But if it breaks existing packages it's more problematic.


        Stefan

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