Make auto-refining a minor mode, and diff- and smerge- use it.

* diff-mode.el (diff-auto-refine): Delete defcustom.
(diff-auto-refine-mode): New func/var via define-minor-mode.
Update var ref to use diff-auto-refine-mode.
* smerge-mode.el (diff-mode): Require when compiling.
(smerge-auto-refine): Delete defcustom.
Update smerge-auto-refine ref to use diff-auto-refine-mode.

1 files changed, 8 insertions, 6 deletions

diff --git a/lisp/diff-mode.el b/lisp/diff-mode.el
index 864d74b4e30..da1cd30198f 100644
--- a/lisp/diff-mode.el
+++ b/lisp/diff-mode.el
@@ -91,11 +91,6 @@ when editing big diffs)."
   :type 'boolean
   :group 'diff-mode)
 
-(defcustom diff-auto-refine t
-  "Automatically highlight changes in detail as the user visits hunks."
-  :type 'boolean
-  :group 'diff-mode)
-
 (defcustom diff-mode-hook nil
   "Run after setting up the `diff-mode' major mode."
   :type 'hook
@@ -220,6 +215,13 @@ when editing big diffs)."
   `((,diff-minor-mode-prefix . ,diff-mode-shared-map))
   "Keymap for `diff-minor-mode'.  See also `diff-mode-shared-map'.")
 
+(define-minor-mode diff-auto-refine-mode
+  "Automatically highlight changes in detail as the user visits hunks.
+When transitioning from disabled to enabled,
+try to refine the current hunk, as well."
+  :group 'diff-mode :init-value t :lighter " Auto-Refine"
+  (when diff-auto-refine-mode
+    (condition-case-no-debug nil (diff-refine-hunk) (error nil))))
 
 ;;;;
 ;;;; font-lock support
@@ -528,7 +530,7 @@ but in the file header instead, in which case move forward to the first hunk."
 ;; Define diff-{hunk,file}-{prev,next}
 (easy-mmode-define-navigation
  diff-hunk diff-hunk-header-re "hunk" diff-end-of-hunk diff-restrict-view
- (if diff-auto-refine
+ (if diff-auto-refine-mode
      (condition-case-no-debug nil (diff-refine-hunk) (error nil))))
 
 (easy-mmode-define-navigation