From: phillip.lord@newcastle.ac.uk (Phillip Lord)
To: Emacs-Devel devel <emacs-devel@gnu.org>
Subject: disabling undo boundaries
Date: Sun, 10 May 2015 22:43:18 +0100 [thread overview]
Message-ID: <87fv746rd5.fsf@newcastle.ac.uk> (raw)
I am a little confused by undo boundaries and how and when they get set.
Consider this, entirely pointless piece of code.
(defvar fix-test-on nil)
(defun fix-test-after-change-function (&rest _)
(when fix-test-on
(with-current-buffer
(get-buffer "*scratch*")
(insert "a"))))
(add-hook 'after-change-functions 'fix-test-after-change-function)
Now, If I delete buffer-undo-list in the current buffer (not *scratch*)
then type "abc", I get a buffer-undo-list something like...
(nil (355 . 358))
Now if I set fix-test-on to t and do the same, I get this.
(nil (357 . 358) nil (356 . 357) nil (355 . 356))
I am wondering why the "nil" undo-boundaries get inserted when I change
*a different* buffer. This does not really make sense to me, and is
causing breakage in my package.
I can't for the life of me find out where this nil boundary is getting
added; it appears to happen *after* the after-change-function ends, as I
find by logging buffer-undo-list in my a-c-f, so it's neither the
buffer-change nor the insert itself. Unfortunately, this also means I
cannot fix the problem in the a-c-f.
Any other ideas welcome!
Phil
next reply other threads:[~2015-05-10 21:43 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-10 21:43 Phillip Lord [this message]
2015-05-11 1:42 ` disabling undo boundaries Stefan Monnier
2015-05-11 11:46 ` Phillip Lord
2015-05-11 14:45 ` Stefan Monnier
2015-05-11 16:31 ` Phillip Lord
2015-05-11 19:30 ` Stefan Monnier
2015-05-11 20:42 ` Phillip Lord
2015-05-11 22:23 ` Stefan Monnier
2015-05-12 11:52 ` Phillip Lord
2015-05-12 20:15 ` Stefan Monnier
2015-05-12 20:59 ` Phillip Lord
2015-05-13 12:32 ` Stefan Monnier
2015-05-13 15:40 ` Phillip Lord
2015-05-14 15:28 ` Stefan Monnier
2015-05-15 12:27 ` Phillip Lord
2015-05-15 18:08 ` Stefan Monnier
2015-05-15 19:49 ` Phillip Lord
2015-05-15 23:45 ` Stefan Monnier
2015-05-16 13:31 ` Phillip Lord
2015-05-19 11:59 ` Phillip Lord
2015-05-19 19:42 ` Stefan Monnier
2015-05-19 21:48 ` Phillip Lord
2015-05-20 2:00 ` Stefan Monnier
2015-05-20 7:45 ` Phillip Lord
2015-05-20 12:53 ` Stefan Monnier
2015-05-21 11:15 ` Phillip Lord
2015-05-21 15:44 ` Stefan Monnier
2015-05-21 17:03 ` Phillip Lord
2015-05-27 11:46 ` Phillip Lord
2015-06-29 0:46 ` Stefan Monnier
2015-08-04 14:18 ` Phillip Lord
2015-08-06 21:02 ` Phillip Lord
2015-08-06 22:20 ` Stefan Monnier
2015-08-07 13:40 ` Phillip Lord
2015-08-07 13:59 ` David Kastrup
2015-08-07 21:10 ` Phillip Lord
2015-08-08 5:39 ` David Kastrup
2015-08-08 9:58 ` Phillip Lord
2015-08-07 17:10 ` Stefan Monnier
2015-08-08 21:28 ` Stefan Monnier
2015-08-09 15:39 ` Phillip Lord
2015-08-09 16:30 ` Stefan Monnier
2015-08-09 16:50 ` Phillip Lord
2015-08-09 17:40 ` Stefan Monnier
2015-08-10 9:27 ` Phillip Lord
2015-08-10 21:21 ` Phillip Lord
2015-08-12 21:15 ` Stefan Monnier
2015-08-12 22:34 ` Phillip Lord
2015-08-13 2:23 ` Stefan Monnier
2015-08-21 9:40 ` Phillip Lord
2015-08-07 23:49 ` Davis Herring
2015-08-08 10:01 ` Phillip Lord
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