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bug#51883: 29.0.50; Command to get accidentally deleted frames back
From: |
Juri Linkov |
Subject: |
bug#51883: 29.0.50; Command to get accidentally deleted frames back |
Date: |
Wed, 19 Jan 2022 20:37:37 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu) |
>>> >> > I tried to use this, but undelete-frame-mode in the File menu
>>> >> > makes no sense: when you mistakenly deleted a frame, you want
>>> >> > to undelete it immediately, so you open the File menu, and
>>> >> > see the message "No way, you can't undelete the deleted frame,
>>> >> > because you were careless and not enabled a special mode".
>>> >> >
>>> >> > So the most useful case for this feature is to get the
>>> >> > accidentally deleted frame back, and it fails to do this.
>>> >> >
>>> >> > Instead, it allows undeleting 16 frames in a special mode.
>>> >> > Is there really a human that can delete 16 frames, and then
>>> >> > remember what was on the 16th frame back?
>>> >> >
>>> >> > Rereading this thread indicates that the only concern about
>>> >> > enabling this by default was the memory footprint for remembering
>>> >> > 16 frames. OTOH, this feature is really useful for remembering
>>> >> > 1 frame. So this is what should be enabled by default:
>>> >>
>>> >> It seems this is the right thing to do, so now pushed to master.
>>> >
>>> > I'm sorry, you cannot do that. We discussed this at some length and
>>> > reached certain conclusions. Then you come and in effect say those
>>> > considerations and discussions make no sense, and you know better?
>>> > Let's please respect our discussions and decisions more than that.
>>> > And if you want others to respect your opinions, please respect
>>> > theirs, even if you disagree. The feature as installed allows you to
>>> > customize it to have that mode turned on by default, so you could
>>> > easily fix your problem by doing that.
>>> >
>>> > Specifically to your main argument: it is no different from deleting a
>>> > file: unless the user took steps to configure the system to allow
>>> > undeleting deleted files, deleted files are lost forever. Moreover,
>>> > in the case of an Emacs frame, nothing of terrible importance is
>>> > actually lost: the buffers displayed in that frame are still there,
>>> > and restoring the deleted frame by hand shouldn't take more than a few
>>> > moments.
>>> >
>>> > So I reverted this changeset. Please in the future don't make such
>>> > changes unilaterally.
>>>
>>> This is not true. This is not a unilateral change. I posted a patch,
>>> then waited for comments 3 days, and when no one commented this means
>>> that everyone agreed that it's a more reasonable change, then pushed to
>>> master.
>>
>> I guess 3 days is not enough, especially in this time of year. My
>> rule of thumb is to wait at least a week, possibly two.
>>
>> But in any case, the amount of time you waited is not the main issue
>> here. The main issue is that we decided to implement this the way we
>> did, and you were even part of that discussion. It makes no sense to
>> undo all that because you suddenly don't like the results.
>
> After applying the patch to test whether it correctly restores the tab-bar,
> I discovered that the weirdest thing was added to the main menu.
>
> No other app has such unusual menu item in the File menu
> because this feature is useful for everyone.
> Just imagine trying to undelete a tab in a web browser,
> then failing to do this when the browser requires
> to enable a special mode to undelete tabs. We can't afford
> to make Emacs more bizarre than it currently is, that
> would scare away users.
>
> Then I recalled that the main argument in the discussion
> against enabling this by default was the memory occupied
> by 16 deleted frames.
>
> So to simplify this I proposed a new option with the default value 1
> instead of the hard-coded number 16. Then waited for 3 days
> that is standard practice. And no comments means that everyone agreed
> with this improvement.
Here is the patch that fixes all these problems:
diff --git a/doc/emacs/frames.texi b/doc/emacs/frames.texi
index ba58f70caf..c641b8ccb1 100644
--- b/doc/emacs/frames.texi
+++ a/doc/emacs/frames.texi
@@ -515,12 +515,14 @@
@item C-x 5 u
@kindex C-x 5 u
@findex undelete-frame
-@findex undelete-frame-mode
-When @code{undelete-frame-mode} is enabled, undelete one of the 16
-most recently deleted frames. Without a prefix argument, undelete the
-most recently deleted frame. With a numerical prefix argument between
-1 and 16, where 1 is the most recently deleted frame, undelete the
-corresponding deleted frame.
+@findex undelete-frame-max
+Undelete one of the recently deleted frames. The user option
+@code{undelete-frame-max} specifies the maximum number of deleted
+frames to keep (the default is 1). Without a prefix argument,
+undelete the most recently deleted frame. With a numerical prefix
+argument between 1 and the number specified by @code{undelete-frame-max},
+where 1 is the most recently deleted frame, undelete the corresponding
+deleted frame.
@item C-z
@kindex C-z @r{(X windows)}
diff --git a/etc/NEWS b/etc/NEWS
index fdbfd9b1be..2e748ce7c5 100644
--- b/etc/NEWS
+++ a/etc/NEWS
@@ -287,11 +287,12 @@
+++
*** Deleted frames can now be undeleted.
-The 16 most recently deleted frames can be undeleted with 'C-x 5 u' when
-'undelete-frame-mode' is enabled. Without a prefix argument, undelete
-the most recently deleted frame. With a numerical prefix argument
-between 1 and 16, where 1 is the most recently deleted frame, undelete
-the corresponding deleted frame.
+The most recently deleted frame can be undeleted with 'C-x 5 u' when
+the new user option 'undelete-frame-max' has its default value 1.
+Without a prefix argument, undelete the most recently deleted frame.
+With a numerical prefix argument between 1 and 'undelete-frame-max',
+where 1 is the most recently deleted frame, undelete the corresponding
+deleted frame.
** Tab Bars and Tab Lines
diff --git a/lisp/frame.el b/lisp/frame.el
index 5926a4d748..599ffe591a 100644
--- b/lisp/frame.el
+++ a/lisp/frame.el
@@ -2529,6 +2529,13 @@
(if iconify (iconify-frame this) (delete-frame this)))
(setq this next))))
+
+(defcustom undelete-frame-max 1
+ "Maximum number of deleted frames before oldest are thrown away."
+ :type 'integer
+ :group 'frames
+ :version "29.1")
+
(eval-when-compile (require 'frameset))
(defvar undelete-frame--deleted-frames nil
@@ -2536,7 +2543,7 @@
(defun undelete-frame--handle-delete-frame (frame)
"Save the configuration of frames deleted with `delete-frame'.
-Only the 16 most recently deleted frames are saved."
+Only the `undelete-frame-max' most recently deleted frames are saved."
(when (frame-live-p frame)
(setq undelete-frame--deleted-frames
(cons
@@ -2555,54 +2562,45 @@
(cons '(display . :never)
frameset-filter-alist))))
undelete-frame--deleted-frames))
- (if (> (length undelete-frame--deleted-frames) 16)
+ (if (> (length undelete-frame--deleted-frames) undelete-frame-max)
(setq undelete-frame--deleted-frames
(butlast undelete-frame--deleted-frames)))))
-(define-minor-mode undelete-frame-mode
- "Enable the `undelete-frame' command."
- :group 'frames
- :global t
- (if undelete-frame-mode
- (add-hook 'delete-frame-functions
- #'undelete-frame--handle-delete-frame -75)
- (remove-hook 'delete-frame-functions
- #'undelete-frame--handle-delete-frame)
- (setq undelete-frame--deleted-frames nil)))
+(add-hook 'after-init-hook
+ (lambda ()
+ (add-hook 'delete-frame-functions
+ #'undelete-frame--handle-delete-frame -75)))
(defun undelete-frame (&optional arg)
"Undelete a frame deleted with `delete-frame'.
-Without a prefix argument, undelete the most recently deleted
-frame.
-With a numerical prefix argument ARG between 1 and 16, where 1 is
-most recently deleted frame, undelete the ARGth deleted frame.
+Without a prefix argument, undelete the most recently deleted frame.
+With a numerical prefix argument ARG between 1 and `undelete-frame-max',
+where 1 is most recently deleted frame, undelete the ARGth deleted frame.
When called from Lisp, returns the new frame."
(interactive "P")
- (if (not undelete-frame-mode)
- (user-error "Undelete-Frame mode is disabled")
- (if (consp arg)
- (user-error "Missing deleted frame number argument")
- (let* ((number (pcase arg ('nil 1) ('- -1) (_ arg)))
- (frames (frame-list))
- (frameset (nth (1- number) undelete-frame--deleted-frames))
- (graphic (display-graphic-p)))
- (if (not (<= 1 number 16))
- (user-error "%d is not a valid deleted frame number argument"
- number)
- (if (not frameset)
- (user-error "No deleted frame with number %d" number)
- (if (not (eq graphic (car frameset)))
- (user-error
- "Cannot undelete a %s display frame on a %s display"
- (if graphic "non-graphic" "graphic")
- (if graphic "graphic" "non-graphic"))
- (setq undelete-frame--deleted-frames
- (delq frameset undelete-frame--deleted-frames))
- (frameset-restore (cdr frameset))
- (let ((frame (car (seq-difference (frame-list) frames))))
- (when frame
- (select-frame-set-input-focus frame)
- frame)))))))))
+ (if (consp arg)
+ (user-error "Missing deleted frame number argument")
+ (let* ((number (pcase arg ('nil 1) ('- -1) (_ arg)))
+ (frames (frame-list))
+ (frameset (nth (1- number) undelete-frame--deleted-frames))
+ (graphic (display-graphic-p)))
+ (if (not (<= 1 number undelete-frame-max))
+ (user-error "%d is not a valid deleted frame number argument"
+ number)
+ (if (not frameset)
+ (user-error "No deleted frame with number %d" number)
+ (if (not (eq graphic (car frameset)))
+ (user-error
+ "Cannot undelete a %s display frame on a %s display"
+ (if graphic "non-graphic" "graphic")
+ (if graphic "graphic" "non-graphic"))
+ (setq undelete-frame--deleted-frames
+ (delq frameset undelete-frame--deleted-frames))
+ (frameset-restore (cdr frameset))
+ (let ((frame (car (seq-difference (frame-list) frames))))
+ (when frame
+ (select-frame-set-input-focus frame)
+ frame))))))))
;;; Window dividers.
(defgroup window-divider nil
diff --git a/lisp/menu-bar.el b/lisp/menu-bar.el
index e5a070b24a..36cbd6a9c5 100644
--- b/lisp/menu-bar.el
+++ a/lisp/menu-bar.el
@@ -109,14 +109,9 @@
(bindings--define-key menu [separator-tab]
menu-bar-separator))
- (bindings--define-key menu [enable-undelete-frame-mode]
- '(menu-item "Enable Undeleting Frames" undelete-frame-mode
- :visible (null undelete-frame-mode)
- :help "Enable undeleting frames in this session"))
(bindings--define-key menu [undelete-last-deleted-frame]
'(menu-item "Undelete Frame" undelete-frame
- :visible (and undelete-frame-mode
- (car undelete-frame--deleted-frames))
+ :visible (car undelete-frame--deleted-frames)
:help "Undelete the most recently deleted frame"))
;; Don't use delete-frame as event name because that is a special
diff --git a/src/frame.c b/src/frame.c
index 959f0c9c14..e5d74edc16 100644
--- b/src/frame.c
+++ a/src/frame.c
@@ -2385,7 +2385,7 @@
doc: /* Delete FRAME, eliminating it from use.
FRAME must be a live frame and defaults to the selected one.
-When `undelete-frame-mode' is enabled, the 16 most recently deleted
+When `undelete-frame-max' is more than 0, the most recently deleted
frames can be undeleted with `undelete-frame', which see.
A frame may not be deleted if its minibuffer serves as surrogate
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Michael Heerdegen, 2022/01/10
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/13
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/14
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Eli Zaretskii, 2022/01/17
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/17
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Eli Zaretskii, 2022/01/17
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/18
- bug#51883: 29.0.50; Command to get accidentally deleted frames back,
Juri Linkov <=
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Eli Zaretskii, 2022/01/19
bug#51883: 29.0.50; Command to get accidentally deleted frames back, Stefan Monnier, 2022/01/21
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/22
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Stefan Monnier, 2022/01/22
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/23
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Stefan Monnier, 2022/01/23
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/23
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Stefan Monnier, 2022/01/23
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Juri Linkov, 2022/01/24
- bug#51883: 29.0.50; Command to get accidentally deleted frames back, Eli Zaretskii, 2022/01/24