GNU bug report logs - #11341
Feature request: make whitespace visible and keep lines wrapped at word boundaries simultaneously

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Matt McClure <matthewlmcclure <at> gmail.com>
Subject: bug#11341: closed (Re: bug#11341: Feature request: make
 whitespace visible and keep lines	wrapped at word boundaries
 simultaneously)
Date: Thu, 26 Apr 2012 10:56:02 +0000

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Your bug report

#11341: Feature request: make whitespace visible and keep lines wrapped at word boundaries simultaneously

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 11341 <at> debbugs.gnu.org.

-- 
11341: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=11341
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Matt McClure <matthewlmcclure <at> gmail.com>
Cc: 11341-done <at> debbugs.gnu.org
Subject: Re: bug#11341: Feature request: make whitespace visible and keep
	lines	wrapped at word boundaries simultaneously
Date: Thu, 26 Apr 2012 13:53:58 +0300

> Date: Wed, 25 Apr 2012 09:37:43 -0400
> From: Matt McClure <matthewlmcclure <at> gmail.com>
> 
> > Date: Sun, 22 Apr 2012 20:29:44 -0400
> > From: Matt McClure <matthewlmcclure <at> gmail.com>
> >
> > When I turn on whitespace-mode in a buffer with word-wrap on, e.g., in
> > visual-line-mode, lines become wrapped at the right edge of the window
> > instead of word boundaries.
> >
> > How can I make whitespace visible and keep lines wrapped at word
> boundaries
> > simultaneously?
> 
> Customize whitespace-display-mappings so that the whitespace
> characters are displayed as themselves, instead of as fancy non-ASCII
> glyphs.  (You will still have the faces to show the whitespace.)
> 
> For a better solution, please file a feature-request bug report, this
> would require changes in the display engine.

Fixed in revision 108046 on the trunk (for Emacs 24.2).  The diffs are
below, if you don't want to wait.


=== modified file 'src/ChangeLog'
--- src/ChangeLog	2012-04-26 10:07:35 +0000
+++ src/ChangeLog	2012-04-26 10:49:29 +0000
@@ -1,5 +1,9 @@
 2012-04-26  Eli Zaretskii  <eliz <at> gnu.org>
 
+	* xdisp.c (IT_DISPLAYING_WHITESPACE): In addition to the loaded
+	display element, check also the underlying string or buffer
+	character.  (Bug#11341)
+
 	* w32menu.c: Include w32heap.h.
 	(add_menu_item): If the call to AppendMenuW (via
 	unicode_append_menu) fails, disable Unicode menus only if we are

=== modified file 'src/xdisp.c'
--- src/xdisp.c	2012-04-20 08:48:50 +0000
+++ src/xdisp.c	2012-04-26 10:49:29 +0000
@@ -383,11 +383,21 @@ static Lisp_Object Qline_height;
 #define IT_OVERFLOW_NEWLINE_INTO_FRINGE(it) 0
 #endif /* HAVE_WINDOW_SYSTEM */
 
-/* Test if the display element loaded in IT is a space or tab
-   character.  This is used to determine word wrapping.  */
-
-#define IT_DISPLAYING_WHITESPACE(it)				\
-  (it->what == IT_CHARACTER && (it->c == ' ' || it->c == '\t'))
+/* Test if the display element loaded in IT, or the underlying buffer
+   or string character, is a space or a TAB character.  This is used
+   to determine where word wrapping can occur.  */
+
+#define IT_DISPLAYING_WHITESPACE(it)					\
+  ((it->what == IT_CHARACTER && (it->c == ' ' || it->c == '\t'))	\
+   || ((STRINGP (it->string)						\
+	&& (SREF (it->string, IT_STRING_BYTEPOS (*it)) == ' '		\
+	    || SREF (it->string, IT_STRING_BYTEPOS (*it)) == '\t'))	\
+       || (it->s							\
+	   && (it->s[IT_BYTEPOS (*it)] == ' '				\
+	       || it->s[IT_BYTEPOS (*it)] == '\t'))			\
+       || (IT_BYTEPOS (*it) < ZV_BYTE					\
+	   && (*BYTE_POS_ADDR (IT_BYTEPOS (*it)) == ' '			\
+	       || *BYTE_POS_ADDR (IT_BYTEPOS (*it)) == '\t'))))		\
 
 /* Name of the face used to highlight trailing whitespace.  */
 

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From: Matt McClure <matthewlmcclure <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Feature request: make whitespace visible and keep lines wrapped at
	word boundaries simultaneously
Date: Wed, 25 Apr 2012 09:37:43 -0400

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---------- Forwarded message ----------
From: Eli Zaretskii <eliz <at> gnu.org>
Date: Wed, Apr 25, 2012 at 5:57 AM
Subject: Re: whitespace-mode and visual-line-mode
To: help-gnu-emacs <at> gnu.org


> Date: Sun, 22 Apr 2012 20:29:44 -0400
> From: Matt McClure <matthewlmcclure <at> gmail.com>
>
> When I turn on whitespace-mode in a buffer with word-wrap on, e.g., in
> visual-line-mode, lines become wrapped at the right edge of the window
> instead of word boundaries.
>
> How can I make whitespace visible and keep lines wrapped at word
boundaries
> simultaneously?

Customize whitespace-display-mappings so that the whitespace
characters are displayed as themselves, instead of as fancy non-ASCII
glyphs.  (You will still have the faces to show the whitespace.)

For a better solution, please file a feature-request bug report, this
would require changes in the display engine.

-- 
Matt McClure
http://www.matthewlmcclure.com
http://www.mapmyfitness.com/profile/matthewlmcclure

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