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bug#4655: 23.1.50; buffer-swap-text oddity
From: |
npostavs |
Subject: |
bug#4655: 23.1.50; buffer-swap-text oddity |
Date: |
Sun, 10 Jul 2016 21:58:36 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.93 (gnu/linux) |
tags 4655 patch
quit
Lars Magne Ingebrigtsen <larsi@gnus.org> writes:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>
>>>> 2- save-excursion saves the "position and current buffer" as a marker.
>>>> Combine 1 and 2 together, and you'll see that save-excursion ends up
>>>> changing the current buffer.
>>
>>> Oops. Yes, I see.
>>> Well, we could document it, but from my POV it looks more like a bug
>>> than a "feature".
>>
>> Agreed. This said, we have a problem.
>
> Has this been fixed? I seem to be unable to reproduce this bug in Emacs
> 24...
Reproduces for me with 23.4 up through 25.0.95. So here's a patch to
mention it in the manual:
>From 7c79e2f1aef7e59d80d7b46533a93f2f23ad6759 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Sun, 10 Jul 2016 21:52:23 -0400
Subject: [PATCH v1] Document buffer-swap-text+save-excursion interaction
* doc/lispref/buffers.texi (Swapping Text): Add warning about
interaction of `buffer-swap-text' and `save-excursion' (Bug #4655).
---
doc/lispref/buffers.texi | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/doc/lispref/buffers.texi b/doc/lispref/buffers.texi
index 1f7f263..22c6726 100644
--- a/doc/lispref/buffers.texi
+++ b/doc/lispref/buffers.texi
@@ -1211,6 +1211,11 @@ Swapping Text
overlays, the text properties, the undo list, the value of the
@code{enable-multibyte-characters} flag (@pxref{Text Representations,
enable-multibyte-characters}), etc.
+
+@strong{Warning:} The current buffer will be set to @var{buffer} if
+this function is called from within @code{save-excursion}, since the
+marker used by @code{save-excursion} to save the position and buffer
+will be swapped as well.
@end defun
If you use @code{buffer-swap-text} on a file-visiting buffer, you
--
2.8.0
- bug#4655: 23.1.50; buffer-swap-text oddity,
npostavs <=
- bug#4655: 23.1.50; buffer-swap-text oddity, Eli Zaretskii, 2016/07/11
- bug#4655: 23.1.50; buffer-swap-text oddity, Markus Rost, 2016/07/11
- bug#4655: 23.1.50; buffer-swap-text oddity, Dmitry Gutov, 2016/07/11
- bug#4655: 23.1.50; buffer-swap-text oddity, npostavs, 2016/07/11
- bug#4655: 23.1.50; buffer-swap-text oddity, Eli Zaretskii, 2016/07/12
- bug#4655: 23.1.50; buffer-swap-text oddity, npostavs, 2016/07/13
- bug#4655: 23.1.50; buffer-swap-text oddity, Eli Zaretskii, 2016/07/14
- bug#4655: 23.1.50; buffer-swap-text oddity, npostavs, 2016/07/14