GNU bug report logs - #12671
24.2.50; diff-kill-hunk with diff-auto-refine-mode jumps to beginning

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ivan Andrus <darthandrus <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; diff-kill-hunk with diff-auto-refine-mode jumps to beginning
Date: Thu, 18 Oct 2012 14:39:13 +0200

In diff mode killing a hunk with diff-auto-refine-mode on will jump to the
beginning of the file-bounds.  This is because `diff-hunk-kill' calls
`diff-hunk-next' when it's getting the file bounds.  The call to
`diff-hunk-next' schedules a timer which moves the point to where it was
when `diff-hunk-next' was called, namely the first hunk of the file.

This seems to be the only problematic call to `diff-hunk-next', but
there are some calls to `diff-hunk-prev' which don't appear to be
problematic.

I'm not sure the best way to fix it, but the patch below is probably the
easiest.


=== modified file 'lisp/vc/diff-mode.el'
--- lisp/vc/diff-mode.el	2012-10-02 03:49:28 +0000
+++ lisp/vc/diff-mode.el	2012-10-18 12:31:06 +0000
@@ -630,7 +630,8 @@
(defun diff-hunk-kill ()
   "Kill the hunk at point."
   (interactive)
-  (let* ((hunk-bounds (diff-bounds-of-hunk))
+  (let* ((diff-auto-refine-mode nil)
+	 (hunk-bounds (diff-bounds-of-hunk))
	 (file-bounds (ignore-errors (diff-bounds-of-file)))
	 ;; If the current hunk is the only one for its file, kill the
	 ;; file header too.


Thanks,
Ivan

In GNU Emacs 24.2.50.7 (i386-apple-darwin10.8.0, NS apple-appkit-1038.36)
of 2012-10-17 on oroszlan.local
Bzr revision: 110569 rgm <at> gnu.org-20121017165612-dp7hrsxxjdfvuu4l
Windowing system distributor `Apple', version 10.3.1038
Configured using:
`configure '--with-ns''

Important settings:
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Diff

Minor modes in effect:
  vc-parent-buffer: init.el
  diff-auto-refine-mode: t
  TeX-PDF-mode: t
  which-function-mode: t
  show-paren-mode: t
  recentf-mode: t
  msb-mode: t
  minibuffer-depth-indicate-mode: t
  global-hl-line-mode: t
  delete-selection-mode: t
  auto-image-file-mode: t
  auto-insert-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  shell-dirtrack-mode: t
  ido-everywhere: t
  global-visible-mark-mode: t
  visible-mark-mode: t
  gvol-mode: t
  desktop-save-mode: t
  drag-stuff-global-mode: t
  drag-stuff-mode: t
  command-frequency-autosave-mode: t
  command-frequency-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
d i f f - a u <return> n n k <C-tab> C-x r j e TAB
TAB C-M-SPC C-M-l C-M-l C-c ; C-k C-x C-s C-x C-e C-M-j
TAB TAB C-M-l C-M-SPC C-M-j C-c ; C-M-j C-M-j C-; TAB
C-; C-M-o C-x C-e <C-tab> n k k <C-tab> <C-tab> M-w
<C-tab> <C-tab> M-W C-s d i f f - a u C-w C-s C-w C-s
TAB TAB C-a TAB TAB C-k C-k C-k C-k TAB TAB C-o C-o
M-o <C-tab> C-k <return> <C-tab> C-k <return> <C-tab>
C-k <return> C-k C-k C-k C-e C-M-u C-M-u C-M-u C-M-u
C-o C-h f <return> <C-tab> M-w M-w <C-tab> C-k C-k
C-k C-k TAB TAB TAB TAB C-a C-M-k C-/ C-o C-h f <return>
C-a C-M-k C-/ <C-tab> M-w <C-tab> C-x r j e C-M-j TAB
TAB C-y C-M-j <return> C-M-j C-M-SPC C-M-l C-j C-M-SPC
C-M-SPC C-M-j C-M-j C-M-l C-M-l TAB TAB TAB TAB TAB
TAB TAB C-k C-a C-k C-c ; TAB C-; C-k C-k C-; TAB C-;
C-k C-; C-k C-k C-k C-k C-k C-x C-s C-x C-e q C-M-j
C-M-l TAB C-e C-j <return> C-e C-d M-\ C-e C-x C-e
<C-tab> <C-tab> C-x v = C-g C-x v = C-a y n n n n k
<C-tab> <C-tab> M-x d i <return> n n n n k k k <C-tab>
C-k C-M-SPC C-M-l <tab> C-M-j C-k C-o C-o C-o C-o C-o
C-o C-o C-o C-k C-k C-k C-k <return> , , s h o w SPC
, , p o i n t <C-S-return> C-k C-k C-o C-o C-l C-l
C-M-k C-/ TAB TAB M-RET C-M-j d C-y C-M-k C-M-o C-M-o
C-M-o C-e C-x C-e C-a C-e C-a C-l C-a C-e C-x C-e <C-tab>
n k k M-x d <return> k C-h e M-x e <backspace> r e
p o <return>

Recent messages:
(point): 396
diff--auto-refine-data: (#<buffer *vc-diff*> . #<marker at 396 in *vc-diff*>)
(point): 1463
diff--auto-refine-data: (#<buffer *vc-diff*> . #<marker at 1463 in *vc-diff*>)
(point): 1972
diff--auto-refine-data: (#<buffer *vc-diff*> . #<marker at 1972 in *vc-diff*>)
(point): 2496
diff--auto-refine-data: (#<buffer *vc-diff*> . #<marker at 2496 in *vc-diff*>)

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emacs)

Message #10 received at 12671-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Ivan Andrus <darthandrus <at> gmail.com>
Cc: 12671-done <at> debbugs.gnu.org
Subject: Re: bug#12671: 24.2.50;
	diff-kill-hunk with diff-auto-refine-mode jumps to beginning
Date: Tue, 23 Oct 2012 14:44:36 -0400

> In diff mode killing a hunk with diff-auto-refine-mode on will jump to the
> beginning of the file-bounds.  This is because `diff-hunk-kill' calls
> `diff-hunk-next' when it's getting the file bounds.  The call to
> `diff-hunk-next' schedules a timer which moves the point to where it was
> when `diff-hunk-next' was called, namely the first hunk of the file.

That was a bug in the timer, indeed.
I installed the patch below which should fix it.

> I'm not sure the best way to fix it, but the patch below is probably the
> easiest.
[...]
> -  (let* ((hunk-bounds (diff-bounds-of-hunk))
> +  (let* ((diff-auto-refine-mode nil)
> +	 (hunk-bounds (diff-bounds-of-hunk))

The auto-refine behavior is definitely suboptimal (it should rather
than triggered by jit-lock, ideally), but I'd rather not disable it
around problematic uses, at last as long as those problematic uses can
be fixed some other way.


        Stefan


=== modified file 'lisp/vc/diff-mode.el'
--- lisp/vc/diff-mode.el	2012-10-02 03:49:28 +0000
+++ lisp/vc/diff-mode.el	2012-10-23 18:37:16 +0000
@@ -581,8 +581,9 @@
                       (with-local-quit
                         (when (buffer-live-p buffer)
                           (with-current-buffer buffer
+                            (save-excursion
                             (goto-char point)
-                            (diff-refine-hunk))))))))))
+                              (diff-refine-hunk)))))))))))
 
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  diff-file diff-file-header-re "file" diff-end-of-file)

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