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* bug#26892: 25.2; whitespace-mode does not turn off correctly
@ 2017-05-11 23:34 Nick Helm
  2017-05-12  6:19 ` Eli Zaretskii
  0 siblings, 1 reply; 6+ messages in thread
From: Nick Helm @ 2017-05-11 23:34 UTC (permalink / raw)
  To: 26892


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
Configured using:
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Configured features:
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For information about GNU Emacs and the GNU system, type C-h C-a.
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^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2017-05-22  4:10 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-05-11 23:34 bug#26892: 25.2; whitespace-mode does not turn off correctly Nick Helm
2017-05-12  6:19 ` 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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