bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[dick.r.chiang]

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From fc29004fe9287ce02eb3aa52abe5a4fc54834663 Mon Sep 17 00:00:00 2001
From: dickmao <dick.r.chiang@gmail.com>
Date: Tue, 9 Aug 2022 07:37:57 -0400
Subject: [PATCH] window-point is a thing

We regularly split the same buffer across two windows (C-x 2) and
position one window as a reference while manipulating the other.

When temporarily switching out one window, say to check a definition,
our flow gets wrecked by C-x b's refusal to flip back to the original
buffer since it's already displayed in another window, albeit, and
very importantly, at a different point (which to belabor things, is
the whole reason we want the same buffer in two windows).

I'm sure this has been proposed many times in the past, the
preservationist society being what it is.

* lisp/ido.el (ido-make-buffer-list-1): De-obfuscate.
(ido-make-buffer-list): Include visible buffer when switching.
(ido-get-buffers-in-frames): De-obfuscate.
* lisp/window.el (read-buffer-to-switch): Include visible buffer.
* test/lisp/ido-tests.el (ert-deftest): Test it.
---
 lisp/ido.el              | 43 +++++++++++++++++++---------------------
 lisp/window.el           |  2 +-
 test/lisp/ido-tests.el   | 21 ++++++++++++++++++++
 test/src/buffer-tests.el | 21 ++++++++++++++++++++
 4 files changed, 63 insertions(+), 24 deletions(-)

diff --git a/lisp/ido.el b/lisp/ido.el
index 134081d6759..5aeb8fcec51 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -3432,32 +3432,32 @@ ido-make-buffer-list-1
 	  (mapcar
 	   (lambda (x)
 	     (let ((name (buffer-name x)))
-	       (if (not (or (ido-ignore-item-p name ido-ignore-buffers) (member name visible)))
-		   name)))
+	       (and (not (ido-ignore-item-p name ido-ignore-buffers))
+                    (not (member name visible))
+	            name)))
 	   (buffer-list frame)))))
 
 (defun ido-make-buffer-list (default)
   "Return the current list of buffers.
-Currently visible buffers are put at the end of the list.
 The hook `ido-make-buffer-list-hook' is run after the list has been
 created to allow the user to further modify the order of the buffer names
 in this list.  If DEFAULT is non-nil, and corresponds to an existing buffer,
 it is put to the start of the list."
-  (let* ((ido-current-buffers (ido-get-buffers-in-frames 'current))
-	 (ido-temp-list (ido-make-buffer-list-1 (selected-frame) ido-current-buffers)))
-    (if ido-temp-list
-	(nconc ido-temp-list ido-current-buffers)
-      (setq ido-temp-list ido-current-buffers))
-    (if ido-predicate
-        (setq ido-temp-list (seq-filter
-                             (lambda (name)
-                               (funcall ido-predicate (cons name (get-buffer name))))
-                             ido-temp-list)))
-    (if default
-	(setq ido-temp-list
-	      (cons default (delete default ido-temp-list))))
-    (if (bound-and-true-p ido-enable-virtual-buffers)
-	(ido-add-virtual-buffers-to-list))
+  (let* ((current (buffer-name (window-buffer (selected-window))))
+         (ido-temp-list (ido-make-buffer-list-1 (selected-frame) (list current))))
+    (when (consp ido-temp-list)
+      (setcdr (last ido-temp-list) (list current)))
+    (when ido-predicate
+      (setq ido-temp-list
+            (seq-filter
+             (lambda (name)
+               (funcall ido-predicate (cons name (get-buffer name))))
+             ido-temp-list)))
+    (when default
+      (setq ido-temp-list
+	    (cons default (delete default ido-temp-list))))
+    (when (bound-and-true-p ido-enable-virtual-buffers)
+      (ido-add-virtual-buffers-to-list))
     (run-hooks 'ido-make-buffer-list-hook)
     ido-temp-list))
 
@@ -3723,11 +3723,8 @@ ido-get-buffers-in-frames
   "Return the list of buffers that are visible in the current frame.
 If optional argument CURRENT is given, restrict searching to the current
 frame, rather than all frames, regardless of value of `ido-all-frames'."
-  (let ((ido-bufs-in-frame nil))
-    (walk-windows 'ido-get-bufname nil
-		  (if current
-		      nil
-		    ido-all-frames))
+  (let (ido-bufs-in-frame)
+    (walk-windows 'ido-get-bufname nil (unless current ido-all-frames))
     ido-bufs-in-frame))
 
 (defun ido-get-bufname (win)
diff --git a/lisp/window.el b/lisp/window.el
index 4d88ffa9039..86996fe9730 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -8673,7 +8673,7 @@ read-buffer-to-switch
               (setq-local icomplete-with-completion-tables
                           (cons rbts-completion-table
                                 icomplete-with-completion-tables))))
-      (read-buffer prompt (other-buffer (current-buffer))
+      (read-buffer prompt (other-buffer (current-buffer) t)
                    (confirm-nonexistent-file-or-buffer)))))
 
 (defun window-normalize-buffer-to-switch-to (buffer-or-name)
diff --git a/test/lisp/ido-tests.el b/test/lisp/ido-tests.el
index 56ef6cde358..034071b52b3 100644
--- a/test/lisp/ido-tests.el
+++ b/test/lisp/ido-tests.el
@@ -51,4 +51,25 @@ ido-directory-too-big-p
   (let ((ido-big-directories (cons (rx "me/di") ido-big-directories)))
     (should (ido-directory-too-big-p "/some/dir/"))))
 
+(ert-deftest ido-buffer-switch-visible ()
+  "switch-to-buffer should include already visible buffers."
+  (let* ((name "test-buffer-switch-visible")
+         (buffer (get-buffer-create name)))
+    (unwind-protect
+        (progn
+          (switch-to-buffer buffer)
+          (delete-other-windows)
+          (split-window-below)
+          (goto-char (point-min))
+          (other-window 1)
+          (insert "foo")
+          (goto-char (point-max))
+          (cl-letf (((symbol-function 'read-from-minibuffer)
+                     (lambda (&rest args) (nth 5 args))))
+            (call-interactively #'ido-switch-buffer)
+            (call-interactively #'ido-switch-buffer))
+          (should (and (equal name (buffer-name)) (eq (point) (point-max)))))
+      (let (kill-buffer-query-functions)
+        (kill-buffer buffer)))))
+
 ;;; ido-tests.el ends here
diff --git a/test/src/buffer-tests.el b/test/src/buffer-tests.el
index 3c6a9208ffa..b34766c2383 100644
--- a/test/src/buffer-tests.el
+++ b/test/src/buffer-tests.el
@@ -1555,4 +1555,25 @@ test-buffer-chars-modified-ticks
       (if f2 (delete-file f2))
       )))
 
+(ert-deftest test-buffer-switch-visible ()
+  "switch-to-buffer should include already visible buffers."
+  (let* ((name "test-buffer-switch-visible")
+         (buffer (get-buffer-create name)))
+    (unwind-protect
+        (progn
+          (switch-to-buffer buffer)
+          (delete-other-windows)
+          (split-window-below)
+          (goto-char (point-min))
+          (other-window 1)
+          (insert "foo")
+          (goto-char (point-max))
+          (cl-letf (((symbol-function 'read-from-minibuffer)
+                     (lambda (&rest args) (nth 5 args))))
+            (call-interactively #'switch-to-buffer)
+            (call-interactively #'switch-to-buffer))
+          (should (and (equal name (buffer-name)) (eq (point) (point-max)))))
+      (let (kill-buffer-query-functions)
+        (kill-buffer buffer)))))
+
 ;;; buffer-tests.el ends here
-- 
2.36.1


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bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> From: dick.r.chiang@gmail.com
> Date: Tue, 09 Aug 2022 08:01:57 -0400
> 
> We regularly split the same buffer across two windows (C-x 2) and
> position one window as a reference while manipulating the other.
> 
> When temporarily switching out one window, say to check a definition,
> our flow gets wrecked by C-x b's refusal to flip back to the original
> buffer since it's already displayed in another window, albeit, and
> very importantly, at a different point (which to belabor things, is
> the whole reason we want the same buffer in two windows).

But if you then insist on switching to that same buffer (which "C-x b"
doesn't refuse, it just doesn't offer it as the default, but you can
bring it up by M-p/M-n in the minibuffer at the prompt), then you will
be shown that buffer at the point you last displayed in that window,
which is what you want.

So I'm not sure what you are trying to fix here, and your description
stops short of telling that.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[dick]

I am reminded of the famous diner scene in Five Easy Pieces (1970).

The waitress didn't refuse the order outright; she did let Jack talk to
the manager.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> From: dick <dick.r.chiang@gmail.com>
> Cc: 57081@debbugs.gnu.org
> Date: Tue, 09 Aug 2022 13:35:49 -0400
> 
> I am reminded of the famous diner scene in Five Easy Pieces (1970).
> 
> The waitress didn't refuse the order outright; she did let Jack talk to
> the manager.

Iuppiter iratus ergo nefas.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Lars Ingebrigtsen]

dick.r.chiang@gmail.com writes:

> When temporarily switching out one window, say to check a definition,
> our flow gets wrecked by C-x b's refusal to flip back to the original
> buffer since it's already displayed in another window, albeit, and
> very importantly, at a different point (which to belabor things, is
> the whole reason we want the same buffer in two windows).

I think adding this might make sense, but with a user option to control
the action.

> * lisp/ido.el (ido-make-buffer-list-1): De-obfuscate.
> (ido-make-buffer-list): Include visible buffer when switching.
> (ido-get-buffers-in-frames): De-obfuscate.
> * lisp/window.el (read-buffer-to-switch): Include visible buffer.
> * test/lisp/ido-tests.el (ert-deftest): Test it.

And as usual, your patch includes a whole bunch of apparently irrelevant
stuff.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> Cc: 57081@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 09 Aug 2022 19:55:54 +0200
> 
> dick.r.chiang@gmail.com writes:
> 
> > When temporarily switching out one window, say to check a definition,
> > our flow gets wrecked by C-x b's refusal to flip back to the original
> > buffer since it's already displayed in another window, albeit, and
> > very importantly, at a different point (which to belabor things, is
> > the whole reason we want the same buffer in two windows).
> 
> I think adding this might make sense, but with a user option to control
> the action.

Which action is that?  As I explained already, if we want to be able
to display the same buffer at another position, that is already
supported in "emacs -Q".

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Which action is that?  As I explained already, if we want to be able
> to display the same buffer at another position, that is already
> supported in "emacs -Q".

I don't think there's any easy way to get the action Dick described --
`C-x 2', `C-x b RET', and then have `C-x b <something-easy>' bring back
the same buffer in that window?

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dick.r.chiang@gmail.com,  57081@debbugs.gnu.org
> Date: Tue, 09 Aug 2022 20:25:30 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Which action is that?  As I explained already, if we want to be able
> > to display the same buffer at another position, that is already
> > supported in "emacs -Q".
> 
> I don't think there's any easy way to get the action Dick described --
> `C-x 2', `C-x b RET', and then have `C-x b <something-easy>' bring back
> the same buffer in that window?

Yes: <something-easy> is M-n, sometimes twice.

I do this all the time, because I frequently have the same buffer
displayed at different positions in two different windows.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> Cc: dick.r.chiang@gmail.com, 57081@debbugs.gnu.org
> Date: Tue, 09 Aug 2022 21:35:51 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > From: Lars Ingebrigtsen <larsi@gnus.org>
> > Cc: dick.r.chiang@gmail.com,  57081@debbugs.gnu.org
> > Date: Tue, 09 Aug 2022 20:25:30 +0200
> > 
> > I don't think there's any easy way to get the action Dick described --
> > `C-x 2', `C-x b RET', and then have `C-x b <something-easy>' bring back
> > the same buffer in that window?
> 
> Yes: <something-easy> is M-n, sometimes twice.

And after you do this once, M-p will also do.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> I don't think there's any easy way to get the action Dick described --
>> `C-x 2', `C-x b RET', and then have `C-x b <something-easy>' bring back
>> the same buffer in that window?
>
> Yes: <something-easy> is M-n, sometimes twice.

That's only the case if you've previously switched to a buffer in a way
that makes that buffer be in the history variable -- but there's a
number of ways to switch to a buffer without that happening.  Like `C-x
C-b' and then selecting a buffer there.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[dick]

EZ> And after you do this once, M-p will also do.

Yes, GNU Emacs users should do that.  Commercial Emacs users will use
"C-x b RET".  Closing.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dick.r.chiang@gmail.com,  57081@debbugs.gnu.org
> Date: Tue, 09 Aug 2022 21:08:43 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> I don't think there's any easy way to get the action Dick described --
> >> `C-x 2', `C-x b RET', and then have `C-x b <something-easy>' bring back
> >> the same buffer in that window?
> >
> > Yes: <something-easy> is M-n, sometimes twice.
> 
> That's only the case if you've previously switched to a buffer in a way
> that makes that buffer be in the history variable

No, that's M-p.  M-n is "future history", it's invented by Emacs.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> No, that's M-p.  M-n is "future history", it's invented by Emacs.

If I select a buffer via `C-x C-b', `C-x 2', `C-x b RET', `C-x b M-n'
just says "End of history" -- in ido.  But in "emacs -Q", hitting `M-n'
twice does get me to the same buffer, like you say.

So I guess this should just be fixed in ido somehow?

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dick.r.chiang@gmail.com,  57081@debbugs.gnu.org
> Date: Tue, 09 Aug 2022 21:29:02 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > No, that's M-p.  M-n is "future history", it's invented by Emacs.
> 
> If I select a buffer via `C-x C-b', `C-x 2', `C-x b RET', `C-x b M-n'
> just says "End of history" -- in ido.  But in "emacs -Q", hitting `M-n'
> twice does get me to the same buffer, like you say.
> 
> So I guess this should just be fixed in ido somehow?

Yes, I think so.  Maybe they override M-n?  (I don't use ido.)

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> > No, that's M-p.  M-n is "future history", it's invented by Emacs.
>> 
>> If I select a buffer via `C-x C-b', `C-x 2', `C-x b RET', `C-x b M-n'
>> just says "End of history" -- in ido.  But in "emacs -Q", hitting `M-n'
>> twice does get me to the same buffer, like you say.
>> 
>> So I guess this should just be fixed in ido somehow?
>
> Yes, I think so.  Maybe they override M-n?  (I don't use ido.)

`M-n' doesn't quite fit in with how ido works -- its thing is that it
always shows you a number of candidates you choose between using the
arrow keys.

Hm...  oh!  Playing with this a bit more, it seems like ido is doing
something similar as `M-n'.  If you hit

C-x b
<right>
<right>

you get the buffer name that was shown in the window earlier -- I
haven't noticed that before.

So there does indeed not seem to be anything to fix here.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: dick.r.chiang@gmail.com,  57081@debbugs.gnu.org
> Date: Fri, 12 Aug 2022 15:06:53 +0200
> 
> Hm...  oh!  Playing with this a bit more, it seems like ido is doing
> something similar as `M-n'.  If you hit
> 
> C-x b
> <right>
> <right>
> 
> you get the buffer name that was shown in the window earlier -- I
> haven't noticed that before.

So ido places "future history" on the <RIGHT> arrow key, it seems.

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[dick]

> So there does indeed not seem to be anything to fix here.

As usual, you people miss the point.

At least we are equally fervent about "being right."

bug#57081: 29.0.50; [PATCH] Point associated with Window for good reasons

[Lars Ingebrigtsen]

dick <dick.r.chiang@gmail.com> writes:

>> So there does indeed not seem to be anything to fix here.
>
> As usual, you people miss the point.

Is there any chance that you'll ever explain what your point is, then?