GNU logs - #9609, boring messages

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Subject: bug#9609: Excessive transient region highlighting with highlight-nonselected-windows
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Package: emacs
Version: 24.0.90

emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))' -f make-frame

Two frames open showing the *scratch* buffer, once frame has focus.

With the mouse, click on the "n" of "notes" in the focused frame. Do
not release the mouse. In the other frame, a region starting or ending
at "n" is now selected.

This does not happen in Emacs 23.3. How do I disable this selection of a
region in the non-selected frame?

(Obviously I can set highlight-nonselected-windows nil, but I want that
behaviour for regions I explicitly select.)

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# seems to be present from 24.1 and up
found 9609 25.1
tags 9609 confirmed
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# seems to be present from 24.1 and up
found 9609 25.1
tags 9609 confirmed
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Subject: bug#9609: Excessive transient region highlighting with highlight-nonselected-windows
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 Content preview: Glenn Morris <rgm@HIDDEN> writes: > emacs -Q --eval '(progn
 (setq highlight-nonselected-windows t) (transient-mark-mode -1))' -f
 make-frame
 > > Two frames open showing the *scratch* buffer, once frame has focus. >
 > With the mouse, cl [...] 
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Glenn Morris <rgm@HIDDEN> writes:

> emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))' -f make-frame
>
> Two frames open showing the *scratch* buffer, once frame has focus.
>
> With the mouse, click on the "n" of "notes" in the focused frame. Do
> not release the mouse. In the other frame, a region starting or ending
> at "n" is now selected.

I can confirm that this is still present in Emacs 28.

Pretty weird behaviour.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Wed, 02 Jun 2021 09:48:05 +0200
> Cc: 9609 <at> debbugs.gnu.org
> 
> Glenn Morris <rgm@HIDDEN> writes:
> 
> > emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))' -f make-frame
> >
> > Two frames open showing the *scratch* buffer, once frame has focus.
> >
> > With the mouse, click on the "n" of "notes" in the focused frame. Do
> > not release the mouse. In the other frame, a region starting or ending
> > at "n" is now selected.
> 
> I can confirm that this is still present in Emacs 28.
> 
> Pretty weird behaviour.

Probably we decided that the mouse was dragged because the coordinates
in the other window are different.  Or something like that.

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> Date: Wed, 02 Jun 2021 15:43:25 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: rgm@HIDDEN, 9609 <at> debbugs.gnu.org
> 
> > > emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))' -f make-frame
> > >
> > > Two frames open showing the *scratch* buffer, once frame has focus.
> > >
> > > With the mouse, click on the "n" of "notes" in the focused frame. Do
> > > not release the mouse. In the other frame, a region starting or ending
> > > at "n" is now selected.
> > 
> > I can confirm that this is still present in Emacs 28.
> > 
> > Pretty weird behaviour.
> 
> Probably we decided that the mouse was dragged because the coordinates
> in the other window are different.  Or something like that.

Btw, you don't need another frame to demonstrate the issue.  You could
do this instead:

  emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))'
  C-x 2
  Click and hold the mouse button on some character

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>> > > emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))' -f make-frame
>> > >
>> > > Two frames open showing the *scratch* buffer, once frame has focus.
>> > >
>> > > With the mouse, click on the "n" of "notes" in the focused frame. Do
>> > > not release the mouse. In the other frame, a region starting or ending
>> > > at "n" is now selected.
>> >
>> > I can confirm that this is still present in Emacs 28.
>> >
>> > Pretty weird behaviour.
>>
>> Probably we decided that the mouse was dragged because the coordinates
>> in the other window are different.  Or something like that.
>
> Btw, you don't need another frame to demonstrate the issue.  You could
> do this instead:
>
>   emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))'
>   C-x 2
>   Click and hold the mouse button on some character

The problem is that currently the mark is not window-local.
I tried such workaround, that fixes the above problem, but it has
other issues.  A proper fix needs to be in some low-level function.

#+begin_src emacs-lisp
;; Make the mark buffer-and-window-local.

(defvar-local mark-active-window nil)

(add-hook 'activate-mark-hook (lambda () (setq mark-active-window (selected-window))))
(advice-add 'activate-mark :after
            (lambda (&rest _args)
              (setq mark-active-window (selected-window)))
            '((name . mark-active-window)))

;; Can't use deactivate-mark-hook because when clicking mouse in another window
;; with the same buffer it calls both activate-mark and deactivate-mark,
;; but deactivate-mark checks if the region is active (region-active-p),
;; and doesn't advance further because mark-active was set to nil in the redisplay
;; hook below.  OTOH, the advice is used unconditionally.
(add-hook 'deactivate-mark-hook (lambda () (setq mark-active-window nil)))
(advice-add 'deactivate-mark :after
            (lambda (&rest _args)
              (setq mark-active-window nil))
            '((name . mark-active-window)))

(defun redisplay--update-mark-active-window (window)
  (when mark-active-window
    (setq mark-active (eq mark-active-window window))))

;; Problem: when compiled without optimization CFLAGS='-O0' then
;; quick region selection experiences lags that results in wrong selection.
;; Another problem is that in ‘follow-mode’ ‘set-mark-command’ messes up windows.
(add-hook 'pre-redisplay-functions #'redisplay--update-mark-active-window)
#+end_src

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> From: Juri Linkov <juri@HIDDEN>
> Cc: larsi@HIDDEN,  rgm@HIDDEN,  9609 <at> debbugs.gnu.org
> Date: Thu, 03 Jun 2021 01:02:25 +0300
> 
> >   emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))'
> >   C-x 2
> >   Click and hold the mouse button on some character
> 
> The problem is that currently the mark is not window-local.

But the region's overlay _is_ specific to the window where it is set.
Or are you saying it isn't the region that is highlighted in the other
window?

Btw, we could decide that we don't care about this quirk: it's a
pretty rare and obscure use case.

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>> >   emacs -Q --eval '(progn (setq highlight-nonselected-windows t) (transient-mark-mode -1))'
>> >   C-x 2
>> >   Click and hold the mouse button on some character
>>
>> The problem is that currently the mark is not window-local.
>
> But the region's overlay _is_ specific to the window where it is set.
> Or are you saying it isn't the region that is highlighted in the other
> window?

The region is activated in both windows of the same buffer.
I thought the problem is here.

> Btw, we could decide that we don't care about this quirk: it's a
> pretty rare and obscure use case.
Last modified: Thu, 3 Jun 2021 20:45:02 UTC

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