C-x v u

C-x v u

[Paul Pogonyshev]

This is not actually a bug, but rather a wish for a change.

When i use C-x v u to revert a buffer, Emacs shows changes that
have been made in another window.  The problem is that M-next
(M-pgdown) and M-prior (M-pgup) scroll the window with the buffer
being reverted, not the window with changes (as far as i understand
this means that the window with changes is active).  Scrolling
changes would be more logical i think.

Paul Pogonyshev

Re: C-x v u

[Kevin Rodgers]

Paul Pogonyshev wrote:

> This is not actually a bug, but rather a wish for a change.
> 
> When i use C-x v u to revert a buffer, Emacs shows changes that
> have been made in another window.  The problem is that M-next
> (M-pgdown) and M-prior (M-pgup) scroll the window with the buffer
> being reverted, not the window with changes (as far as i understand
> this means that the window with changes is active).  Scrolling
> changes would be more logical i think.

I agree, but I can't see how to change the relevant code:


     (unless (vc-workfile-unchanged-p file)
       ;; vc-diff selects the new window, which is not what we want:
       ;; if the new window is on another frame, that'd require the user
       ;; moving her mouse to answer the yes-or-no-p question.
       (let ((win (save-selected-window
		   (setq status (vc-diff nil t)) (selected-window))))
	(vc-exec-after `(message nil))
	(when status
	  (unwind-protect
	      (unless (yes-or-no-p "Discard changes? ")
		(error "Revert canceled"))
	    (select-window win)
	    (if (one-window-p t)
		(if (window-dedicated-p (selected-window))
		    (make-frame-invisible))
	      (delete-window))))))

The problem is that you can't bind minibuffer-scroll-window around the
call to yes-or-no-p like this, because that calls read_minibuf (via
Fread_from_minibuffer ), which resets it to the selected window (which
we don't want to change, as explained in the comment):

     (unless (vc-workfile-unchanged-p file)
       ;; vc-diff selects the new window, which is not what we want:
       ;; if the new window is on another frame, that'd require the user
       ;; moving her mouse to answer the yes-or-no-p question.
       (let ((win (selected-window))
	    (status (vc-diff nil t))
	    (minibuffer-scroll-window (selected-window)))
	(when (window-live-p win)
	  (select-window win))
	(vc-exec-after `(message nil))
	(when status
	  (unwind-protect
	      (unless (yes-or-no-p "Discard changes? ")
		(error "Revert canceled"))
	    (select-window win)
	    (if (one-window-p t)
		(if (window-dedicated-p (selected-window))
		    (make-frame-invisible))
	      (delete-window))))))

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>