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Re: can't customize compare-windows to have previous behaviour

From: Juri Linkov
Subject: Re: can't customize compare-windows to have previous behaviour
Date: Sat, 24 Mar 2007 10:32:00 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.95 (gnu/linux)

> Yet when I go to customise compare-windows-sync, I don't see any
> option to set it to nil; all I seem to be able to chose is to set it
> to a function or a regexp.

The following patch adds an option `nil' which disables the syncing
behavior.  It also renames the old cryptic group name `compare-w' to the
full name `compare-windows' which is the real name of this Emacs feature.

Index: lisp/compare-w.el
RCS file: /sources/emacs/emacs/lisp/compare-w.el,v
retrieving revision 1.38
diff -u -r1.38 compare-w.el
--- lisp/compare-w.el   21 Jan 2007 03:53:12 -0000      1.38
+++ lisp/compare-w.el   24 Mar 2007 08:31:36 -0000
@@ -32,7 +32,7 @@
 ;;; Code:
-(defgroup compare-w nil
+(defgroup compare-windows nil
   "Compare text between windows."
   :prefix "compare-"
   :group 'tools)
@@ -52,18 +52,18 @@
 If the function returns the same value for both windows, then the
 whitespace is considered to match, and is skipped."
   :type '(choice regexp function)
-  :group 'compare-w)
+  :group 'compare-windows)
 (defcustom compare-ignore-whitespace nil
   "*Non-nil means `compare-windows' ignores whitespace."
   :type 'boolean
-  :group 'compare-w
+  :group 'compare-windows
   :version "22.1")
 (defcustom compare-ignore-case nil
   "*Non-nil means `compare-windows' ignores case differences."
   :type 'boolean
-  :group 'compare-w)
+  :group 'compare-windows)
 (defcustom compare-windows-sync 'compare-windows-sync-default-function
   "*Function or regexp that is used to synchronize points in two
@@ -87,10 +87,11 @@
 the nature of the difference units separator.  The variable can
 be made buffer-local.
-If the value of this variable is `nil', then function `ding' is
-called to beep or flash the screen when points are mismatched."
-  :type '(choice regexp function)
-  :group 'compare-w
+If the value of this variable is `nil' (option \"No sync\"), then
+no synchronization is performed and the function `ding' is called
+to beep or flash the screen when points are mismatched."
+  :type '(choice function regexp (const :tag "No sync" nil))
+  :group 'compare-windows
   :version "22.1")
 (defcustom compare-windows-sync-string-size 32
@@ -102,7 +103,7 @@
 The default value 32 is good for the most cases."
   :type 'integer
-  :group 'compare-w
+  :group 'compare-windows
   :version "22.1")
 (defcustom compare-windows-recenter nil
@@ -113,7 +114,7 @@
 The value `(-1 0)' is useful if windows are split vertically,
 and the value `((4) (4))' for horizontally split windows."
   :type '(list sexp sexp)
-  :group 'compare-w
+  :group 'compare-windows
   :version "22.1")
 (defcustom compare-windows-highlight t
@@ -125,13 +126,13 @@
   :type '(choice (const :tag "No highlighting" nil)
                 (const :tag "Persistent highlighting" persistent)
                 (other :tag "Highlight until next command" t))
-  :group 'compare-w
+  :group 'compare-windows
   :version "22.1")
 (defface compare-windows
   '((t :inherit lazy-highlight))
   "Face for highlighting of compare-windows difference regions."
-  :group 'compare-w
+  :group 'compare-windows
   :version "22.1")
 (defvar compare-windows-overlay1 nil)

Juri Linkov

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