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Re: Problem with undo and text properties.

From: Alan Mackenzie
Subject: Re: Problem with undo and text properties.
Date: Mon, 13 Apr 2015 19:10:40 +0000
User-agent: Mutt/1.5.23 (2014-03-12)

Hello, Stefan.

Sorry for the delay in responding.  My network connection went down on
Thursday afternoon, and I had to wait until this morning to get it back.
You've got to love Deutsche Telekom.  :-(

[Context: load medium sized file.h.  C-x h, M-w, M->, C-y, C-x u.  The
C-x u goes slowly.]

On Thu, Apr 09, 2015 at 09:17:04AM -0400, Stefan Monnier wrote:
> > However, if you then undo this with C-x u, it takes almost forever to
> > complete.  The reason is that in the undo list there are lots (~6500) of
> > text property entries like

> >     (nil fontified nil 92222 . 92237)

> The problem is that those entries shouldn't be there in the first place.
> Whoever puts them there needs a with-silent-modification.

1. M-w puts the string-version-of-the-entire-file (including text
properties) into the kill ring.
2. C-y first appends that string to the buffer, ...
3. ... then separately removes the yank-excluded-properties from the
buffer, creating (nil fontified nil 92222. 92237) in buffer-undo-list in
so doing.

The part of C-y that does 3 is remove-yank-excluded-properties.  I think
you're suggesting we put a with-silent-modification around the critical
bits in remove-yank-excluded-properties.  Maybe I'll try that.

>         Stefan

Alan Mackenzie (Nuremberg, Germany).

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