Fix defun navigation in vc log view.

lisp/ChangeLog

+2014-01-06  Daniel Colascione  <dancol@dancol.org>
+
+	Fix defun navigation in vc log view.
+
+	* vc/log-view.el (log-view-beginning-of-defun): Rewrite to behave
+	like `beginning-of-defun'.
+	(log-view-end-of-defun,log-view-end-of-defun-1): Rename old
+	log-view-end-of-defun to log-view-end-of-defun-1. Replace
+	log-view-end-of-defun with wrapper that behaves like
+	`end-of-defun'.
+	(log-view-extract-comment): Call `log-view-current-entry' directly
+	instead of relying on broken `log-view-beginning-of-defun'
+	behavior.
+
 2014-01-06  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Spelling fixes.

lisp/vc/log-view.el

@@ -429,18 +429,28 @@ to the beginning of the ARGth following entry.
 This is Log View mode's default `beginning-of-defun-function'.
 It assumes that a log entry starts with a line matching
 `log-view-message-re'."
-  (if (or (null arg) (zerop arg))
-      (setq arg 1))
+  (when (null arg) (setf arg 1))
   (if (< arg 0)
-      (dotimes (_n (- arg))
-	(log-view-end-of-defun))
-    (catch 'beginning-of-buffer
-      (dotimes (_n arg)
-	(or (log-view-current-entry nil t)
-	    (throw 'beginning-of-buffer nil)))
-      (point))))
-
-(defun log-view-end-of-defun ()
+      (log-view-end-of-defun (- arg))
+    (let ((found t))
+      (while (> arg 0)
+        (setf arg (1- arg))
+        (let ((cur-start (log-view-current-entry)))
+          (setf found
+                (cond ((null cur-start)
+                       (goto-char (point-min))
+                       nil)
+                      ((>= (car cur-start) (point))
+                       (unless (bobp)
+                         (forward-line -1)
+                         (setf arg (1+ arg)))
+                       nil)
+                      (t
+                       (goto-char (car cur-start))
+                       t)))))
+      found)))
+
+(defun log-view-end-of-defun-1 ()
   "Move forward to the next Log View entry."
   (let ((looping t))
     (if (looking-at log-view-message-re)
@@ -457,6 +467,16 @@ It assumes that a log entry starts with a line matching
 	(setq looping nil)
 	(forward-line -1))))))
 
+(defun log-view-end-of-defun (&optional arg)
+  "Move forward to the next Log View entry.
+Works like `end-of-defun'."
+  (when (null arg) (setf arg 1))
+  (if (< arg 0)
+      (log-view-beginning-of-defun (- arg))
+    (dotimes (_n arg)
+      (log-view-end-of-defun-1)
+      t)))
+
 (defvar cvs-minor-current-files)
 (defvar cvs-branch-prefix)
 (defvar cvs-secondary-branch-prefix)
@@ -511,7 +531,8 @@ If called interactively, visit the version at point."
       (cond ((eq backend 'SVN)
 	     (forward-line -1)))
       (setq en (point))
-      (log-view-beginning-of-defun)
+      (or (log-view-current-entry nil t)
+          (throw 'beginning-of-buffer nil))
       (cond ((memq backend '(SCCS RCS CVS MCVS SVN))
 	     (forward-line 2))
 	    ((eq backend 'Hg)