From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: M-w, then C-y. C-y inserts text properties that aren't on original.
Date: Fri, 19 Feb 2010 12:24:19 +0000 [thread overview]
Message-ID: <20100219122419.GA918@muc.de> (raw)
In-Reply-To: <838wapy3yo.fsf@gnu.org>
Hi, Eli,
On Fri, Feb 19, 2010 at 11:22:55AM +0200, Eli Zaretskii wrote:
> > Date: Thu, 18 Feb 2010 20:29:02 +0000
> > From: Alan Mackenzie <acm@muc.de>
> > In a C++ Mode buffer, I create a region containing a template-opener <,
> > M-w it, then C-y it.
> > The C-y puts a syntax-table property on the (copy of) the <, but this
> > property didn't exist on the original.
> > What _was_ on the original was a category property whose symbol had a
> > syntax-table property.
> > This is the root cause of bug 5570 (indentation messed up in C++).
> > Would somebody please suggest the part of Emacs I should be looking at
> > to debug this problem.
> Can you please give a precise recipe, starting with "emacs -Q", for
> reproducing the problem? I don't know enough about C++ Mode internals
> to understand what you say.
#########################################################################
emacs -Q
(defvar propp-var nil)
(put 'propp-var 'foo t)
Create buffer "foo" and put a line of text (including NL) into it.
(with-current-buffer "foo" (put-text-property 1 2 'category 'propp-var))
In foo:
M-< ; goto BOB
C-<space> C-n M-w ; Copy L1 into the kill ring
C-y ; Yank it as L2
M-< C-u C-x = ; Get details of char at BOB
There are text properties here:
category propp-var ; <==============================
fontified t
C-n C-u C-x = ; Get details of char at BOL 2
There are text properties here:
fontified t
foo t ; <==============================
#########################################################################
Note that where the original "had" a 'foo property by indirection through
the 'category, the copy has spuriously short-circuited the 'category
indirection.
> Thanks.
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2010-02-19 12:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-18 20:29 M-w, then C-y. C-y inserts text properties that aren't on original Alan Mackenzie
2010-02-19 4:47 ` Stefan Monnier
2010-02-19 9:22 ` Eli Zaretskii
2010-02-19 12:24 ` Alan Mackenzie [this message]
2010-02-19 14:35 ` Alan Mackenzie
2010-02-20 9:02 ` Eli Zaretskii
2010-02-20 9:25 ` Eli Zaretskii
[not found] ` <20100221215951.GD4407@muc.de>
2010-02-22 4:12 ` Eli Zaretskii
2010-02-22 12:56 ` Alan Mackenzie
2010-02-22 22:11 ` Daniel Colascione
2010-02-23 4:43 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2010-02-22 20:30 MON KEY
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