From: Nick Helm <nick@tenpoint.co.nz>
To: 26892@debbugs.gnu.org
Subject: bug#26892: 25.2; whitespace-mode does not turn off correctly
Date: Fri, 12 May 2017 11:34:33 +1200 [thread overview]
Message-ID: <m2bmqz9ddi.fsf@tenpoint.co.nz> (raw)
Emacs -Q
C-u 20 SPC RET RET RET RET ; type some random whitespace
M-x global-whitespace-mode
M-x whitespace-mode
M-x whitespace-mode
The last command should toggle local whitespace-mode off, but note that the
whitespace display characters are not properly removed from the current
buffer.
I had a look at whitespace.el and I think the problem lies in
`whitespace-display-char-on'. Among other things, this function stores the
buffer display table and replaces it with a temporary display table to show
whitespace chars. The original is restored when the mode is turned off.
However, with global-whitespace-mode active, there is already a temporary
display table in place, which whitespace-mode incorrectly picks up and stores,
clobbering the original display table in the process. When whitespace-mode is
turned off, it restores the temporary display table set by
global-whitespace-mode, which leads to the problem.
Here's a little patch to check if global-whitespace-mode is active before
storing the display table. I've tried this for a few days with no obvious
problems.
--- whitespace-a.el 2017-05-12 00:59:34.000000000 +1200
+++ whitespace-b.el 2017-05-12 01:02:26.000000000 +1200
@@ -2496,9 +2496,10 @@
(let (vecs vec)
;; Remember whether a buffer has a local display table.
(unless whitespace-display-table-was-local
- (setq whitespace-display-table-was-local t
- whitespace-display-table
- (copy-sequence buffer-display-table))
+ (setq whitespace-display-table-was-local t)
+ (unless global-whitespace-mode
+ (setq whitespace-display-table
+ (copy-sequence buffer-display-table)))
;; Assure `buffer-display-table' is unique
;; when two or more windows are visible.
(setq buffer-display-table
In GNU Emacs 25.2.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 Version 10.9.5 (Build 13F1911))
of 2017-04-22 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1504
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next reply other threads:[~2017-05-11 23:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-11 23:34 Nick Helm [this message]
2017-05-12 6:19 ` bug#26892: 25.2; whitespace-mode does not turn off correctly Eli Zaretskii
2017-05-15 0:26 ` Nick Helm
2017-05-19 12:27 ` Eli Zaretskii
2017-05-21 23:11 ` Nick Helm
2017-05-22 4:10 ` Eli Zaretskii
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