bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[dick.r.chiang]

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[-- Attachment #1: 0001-Avoid-the-hanging-chad-of-Backtrace.patch --]
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From 45147670525b4556e69dcba7b9d3497738d7e023 Mon Sep 17 00:00:00 2001
From: dickmao <dick.r.chiang@gmail.com>
Date: Wed, 8 Jun 2022 17:24:41 -0400
Subject: [PATCH] Avoid the hanging chad of "*Backtrace*"

make TEST_INTERACTIVE=yes test/lisp/abbrev-tests

* lisp/emacs-lisp/debug.el (debugger-buffer-name): DRY.
(debug): Don't just erase the *Backtrace*; kill it.
* test/lisp/abbrev-tests.el (copy-abbrev-table-test):
We have `ignore-errors` for this purpose.
(abbrev-tests-backtrace-bury): Test it.
---
 lisp/emacs-lisp/debug.el  | 113 ++++++++++++++++++--------------------
 test/lisp/abbrev-tests.el |  20 +++++--
 2 files changed, 68 insertions(+), 65 deletions(-)

diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
index 6c172d6c31d..c1c977ce66e 100644
--- a/lisp/emacs-lisp/debug.el
+++ b/lisp/emacs-lisp/debug.el
@@ -95,6 +95,8 @@ debug-allow-recursive-debug
   :type 'boolean
   :version "29.1")
 
+(defconst debugger-buffer-name "*Backtrace*")
+
 (defvar debugger-step-after-exit nil
   "Non-nil means \"single-step\" after the debugger exits.")
 
@@ -162,18 +164,13 @@ debugger--restore-buffer-state
 ;;;###autoload
 (defun debug (&rest args)
   "Enter debugger.  \\<debugger-mode-map>`\\[debugger-continue]' returns from the debugger.
-Arguments are mainly for use when this is called from the internals
-of the evaluator.
 
-You may call with no args, or you may pass nil as the first arg and
-any other args you like.  In that case, the list of args after the
-first will be printed into the backtrace buffer.
+ARGS are for internal use of the evaluator, which inserts the
+symbol \\='debug to avoid printing extraneous debugger stack frames.
 
-If `inhibit-redisplay' is non-nil when this function is called,
-the debugger will not be entered."
+A non-nil `inhibit-redisplay' precludes any action."
   (interactive)
   (if inhibit-redisplay
-      ;; Don't really try to enter debugger within an eval from redisplay.
       debugger-value
     (let ((non-interactive-frame
            (or noninteractive           ;FIXME: Presumably redundant.
@@ -187,50 +184,49 @@ debug
                     (equal "initial_terminal" (terminal-name)))))
           ;; Don't let `inhibit-message' get in our way (especially important if
           ;; `non-interactive-frame' evaluated to a non-nil value.
-          (inhibit-message nil)
+          inhibit-message
           ;; We may be entering the debugger from a context that has
           ;; let-bound `inhibit-read-only', which means that all
           ;; buffers would be read/write while the debugger is running.
-          (inhibit-read-only nil))
+          inhibit-read-only)
       (unless non-interactive-frame
         (message "Entering debugger..."))
-      (let (debugger-value
-	    (debugger-previous-state
-             (if (get-buffer "*Backtrace*")
-                 (with-current-buffer (get-buffer "*Backtrace*")
-                   (debugger--save-buffer-state))))
-            (debugger-args args)
-	    (debugger-buffer (get-buffer-create "*Backtrace*"))
-	    (debugger-old-buffer (current-buffer))
-	    (debugger-window nil)
-	    (debugger-step-after-exit nil)
-            (debugger-will-be-back nil)
-	    ;; Don't keep reading from an executing kbd macro!
-	    (executing-kbd-macro nil)
-	    ;; Save the outer values of these vars for the `e' command
-	    ;; before we replace the values.
-	    (debugger-outer-match-data (match-data))
-	    (debugger-with-timeout-suspend (with-timeout-suspend)))
+      (let* ((debugger-old-buffer (current-buffer))
+             (debugger-previous-state
+              (when-let ((buf (get-buffer debugger-buffer-name)))
+                (with-current-buffer buf
+                  (debugger--save-buffer-state))))
+             (debugger-buffer (get-buffer-create debugger-buffer-name))
+             (debugger-args args)
+	     ;; Save the outer values of these vars for the `e' command
+	     ;; before we replace the values.
+	     (debugger-outer-match-data (match-data))
+	     (debugger-with-timeout-suspend (with-timeout-suspend))
+             debugger-value debugger-window
+             debugger-step-after-exit debugger-will-be-back
+             debugger-step-after-exit
+	     ;; Don't keep reading from an executing kbd macro!
+             executing-kbd-macro)
         ;; Set this instead of binding it, so that `q'
         ;; will not restore it.
         (setq overriding-terminal-local-map nil)
         ;; Don't let these magic variables affect the debugger itself.
-        (let ((last-command nil) this-command track-mouse
-	      (inhibit-trace t)
-	      unread-command-events
-	      unread-post-input-method-events
-	      last-input-event last-command-event last-nonmenu-event
-	      last-event-frame
-	      overriding-local-map
+        (let ((inhibit-trace t)
 	      (load-read-function #'read)
 	      ;; If we are inside a minibuffer, allow nesting
 	      ;; so that we don't get an error from the `e' command.
 	      (enable-recursive-minibuffers
 	       (or enable-recursive-minibuffers (> (minibuffer-depth) 0)))
-	      (standard-input t) (standard-output t)
-	      inhibit-redisplay
-	      (cursor-in-echo-area nil)
-	      (window-configuration (current-window-configuration)))
+	      (standard-input t)
+              (standard-output t)
+	      (window-configuration (current-window-configuration))
+              last-command this-command track-mouse
+	      unread-command-events
+	      unread-post-input-method-events
+	      inhibit-redisplay cursor-in-echo-area
+	      last-input-event last-command-event last-nonmenu-event
+	      last-event-frame
+	      overriding-local-map)
 	  (unwind-protect
 	      (save-excursion
 	        (when (eq (car debugger-args) 'debug)
@@ -272,22 +268,19 @@ debug
 		          `((previous-window . ,debugger-previous-window))))))
 	        (setq debugger-window (selected-window))
 		(when debugger-jumping-flag
-		  ;; Try to restore previous height of debugger
-		  ;; window.
-		  (condition-case nil
-		      (window-resize
-		       debugger-window
-		       (- debugger-previous-window-height
-			  (window-total-height debugger-window)))
-		    (error nil))
+		  ;; Restore previous height of debugger window.
+		  (ignore-errors
+		    (window-resize
+		     debugger-window
+		     (- debugger-previous-window-height
+			(window-total-height debugger-window))))
 		  (setq debugger-previous-window debugger-window))
 	        (message "")
-	        (let ((standard-output nil)
+	        (let (standard-output
 		      (buffer-read-only t))
 		  (message "")
 		  ;; Make sure we unbind buffer-read-only in the right buffer.
-		  (save-excursion
-		    (recursive-edit))))
+		  (save-excursion (recursive-edit))))
 	    (when (and (window-live-p debugger-window)
 		       (eq (window-buffer debugger-window) debugger-buffer))
 	      ;; Record height of debugger window.
@@ -298,23 +291,21 @@ debug
 	        (set-window-configuration window-configuration)
 	      (when (and (window-live-p debugger-window)
 		         (eq (window-buffer debugger-window) debugger-buffer))
-	        (progn
-		  ;; Unshow debugger-buffer.
-		  (quit-restore-window debugger-window debugger-bury-or-kill)
-		  ;; Restore current buffer (Bug#12502).
-		  (set-buffer debugger-old-buffer)))
+	        ;; Unshow debugger-buffer.
+		(quit-restore-window debugger-window debugger-bury-or-kill)
+		;; Restore current buffer (Bug#12502).
+		(set-buffer debugger-old-buffer))
               ;; Forget debugger window, it won't be back (Bug#17882).
               (setq debugger-previous-window nil))
             ;; Restore previous state of debugger-buffer in case we were
             ;; in a recursive invocation of the debugger, otherwise just
-            ;; erase the buffer.
+            ;; kill the buffer.
 	    (when (buffer-live-p debugger-buffer)
-	      (with-current-buffer debugger-buffer
-	        (if debugger-previous-state
-                    (debugger--restore-buffer-state debugger-previous-state)
-                  (setq backtrace-insert-header-function nil)
-                  (setq backtrace-frames nil)
-                  (backtrace-print))))
+              (if debugger-previous-state
+	          (with-current-buffer debugger-buffer
+	            (debugger--restore-buffer-state debugger-previous-state))
+                (let (kill-buffer-query-functions)
+                  (kill-buffer debugger-buffer))))
 	    (with-timeout-unsuspend debugger-with-timeout-suspend)
 	    (set-match-data debugger-outer-match-data)))
         (setq debug-on-next-call debugger-step-after-exit)
diff --git a/test/lisp/abbrev-tests.el b/test/lisp/abbrev-tests.el
index 947178473e4..eb9d48871d4 100644
--- a/test/lisp/abbrev-tests.el
+++ b/test/lisp/abbrev-tests.el
@@ -89,11 +89,23 @@ copy-abbrev-table-test
   (should (abbrev-table-p foo-abbrev-table))
   ;; Bug 21828
   (let ((new-foo-abbrev-table
-         (condition-case nil
-             (copy-abbrev-table foo-abbrev-table)
-           (error nil))))
+         (ignore-errors (copy-abbrev-table foo-abbrev-table))))
     (should (abbrev-table-p new-foo-abbrev-table)))
-  (should-not (string-equal (buffer-name) "*Backtrace*")))
+  (should-not (string-equal (buffer-name) debugger-buffer-name)))
+
+(ert-deftest abbrev-tests-backtrace-bury ()
+  "No hanging *Backtrace* chads."
+  (skip-unless (not noninteractive))
+  (let ((pop-after (lambda (&rest _args) (throw 'here t))))
+    (should
+     (unwind-protect
+         (catch 'here
+           (add-function :after (symbol-function 'pop-to-buffer) pop-after)
+           (should (advice-member-p pop-after 'pop-to-buffer))
+           (debug))
+       (remove-function (symbol-function 'pop-to-buffer) pop-after)))
+    (should-not (advice-member-p pop-after 'pop-to-buffer))
+    (should-not (get-buffer debugger-buffer-name))))
 
 (ert-deftest abbrev-table-empty-p-test ()
   (should-error (abbrev-table-empty-p 42))
-- 
2.35.1


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In Commercial Emacs 0.3.1snapshot 89d2679 in dev (upstream 29.0.50, x86_64-pc-linux-gnu) built on dick
Repository revision: 89d2679ecae1f6a4e298a00c031db80a600237b6
Repository branch: dev
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04.3 LTS

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bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Eli Zaretskii]

> From: dick.r.chiang@gmail.com
> Date: Wed, 08 Jun 2022 17:28:29 -0400
> 
> Subject: [PATCH] Avoid the hanging chad of "*Backtrace*"
                   ^^^^^^^^^^^^^^^^^^^^^^
What does this mean?

> * lisp/emacs-lisp/debug.el (debugger-buffer-name): DRY.

Say what?

> (debug): Don't just erase the *Backtrace*; kill it.

Why?

>  lisp/emacs-lisp/debug.el  | 113 ++++++++++++++++++--------------------

Where's the meat?  Will you ever learn to separate small changes from
large refactoring, so that your patches could be reviewed in
reasonable time and with reasonable effort?  Will you ever learn to
respect comments left behind by others and not blindly delete them for
no good reason?

Until you do learn all that, expect most if not all of your
submissions to be turned down.  If you want to contribute to a
project, you will need to learn to play by its rules.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Juri Linkov]

>            ;; Don't let `inhibit-message' get in our way (especially important if
>            ;; `non-interactive-frame' evaluated to a non-nil value.
> -          (inhibit-message nil)
> +          inhibit-message
>            ;; We may be entering the debugger from a context that has
>            ;; let-bound `inhibit-read-only', which means that all
>            ;; buffers would be read/write while the debugger is running.
> -          (inhibit-read-only nil))
> +          inhibit-read-only)

Often an explicit nil value is used as an indication that it
overrides the default value.  This helps to read source code.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

dick.r.chiang@gmail.com writes:

> Subject: [PATCH] Avoid the hanging chad of "*Backtrace*"

Most people do not use paper punches anymore, and are likely to think of
the urban slang meaning of "chad" instead.  Mysterious commit messages
do not belong in our source code.

> * lisp/emacs-lisp/debug.el (debugger-buffer-name): DRY.
> (debug): Don't just erase the *Backtrace*; kill it.
> * test/lisp/abbrev-tests.el (copy-abbrev-table-test):
> We have `ignore-errors` for this purpose.
> (abbrev-tests-backtrace-bury): Test it.
> ---
>  lisp/emacs-lisp/debug.el  | 113 ++++++++++++++++++--------------------
>  test/lisp/abbrev-tests.el |  20 +++++--

So exactly what is the problem, and where is the fix?  And why is
`abbrev-tests.el' related?

>  2 files changed, 68 insertions(+), 65 deletions(-)
>
> diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
> index 6c172d6c31d..c1c977ce66e 100644
> --- a/lisp/emacs-lisp/debug.el
> +++ b/lisp/emacs-lisp/debug.el
> @@ -95,6 +95,8 @@ debug-allow-recursive-debug
>    :type 'boolean
>    :version "29.1")
>  
> +(defconst debugger-buffer-name "*Backtrace*")

No doc string.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

dick.r.chiang@gmail.com writes:

> Subject: [PATCH] Avoid the hanging chad of "*Backtrace*"
>
> make TEST_INTERACTIVE=yes test/lisp/abbrev-tests

If I run that line on the current trunk, I don't get any *Backtrace*
buffer (if that's indeed what you meant to imply).  Do you have a better
recipe for reproduction of whatever the problem is?

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[dick]

(let ((pop-after (lambda (&rest _args) (throw 'here t))))
  (unwind-protect
      (catch 'here
        (add-function :after (symbol-function 'pop-to-buffer) pop-after)
        (debug))
    (remove-function (symbol-function 'pop-to-buffer) pop-after))
  (cl-assert (not (get-buffer "*Backtrace*"))))

OR

(let ((debug-on-error t))
  (error "No chads please."))

Then type "q", "C-x C-b", and note the empty lurker *Backtrace*.

Apparently I'm the only one irked by this recurring bugaboo.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

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

> (let ((debug-on-error t))
>   (error "No chads please."))
>
> Then type "q", "C-x C-b", and note the empty lurker *Backtrace*.

Ah, yes, that's annoying.  I agree that we should kill the *Backtrace*
buffer -- the current code just empties the buffer, but leaves it
behind, which doesn't seem useful.

(`q' aka `bury-buffer' commonly in many modes, well, buries the buffer,
but in this case we empty it first, so it's not useful to avoid killing
it in this case.)

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Juri Linkov]

> (let ((debug-on-error t))
>   (error "No chads please."))
>
> Then type "q", "C-x C-b", and note the empty lurker *Backtrace*.
>
> Apparently I'm the only one irked by this recurring bugaboo.

A better question is why *Backtrace* is erased?
Often I accidentally quit the backtrace, then
try to switch to the *Backtrace* buffer to check
the backtrace again, but to no avail.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> A better question is why *Backtrace* is erased?
> Often I accidentally quit the backtrace, then
> try to switch to the *Backtrace* buffer to check
> the backtrace again, but to no avail.

I don't think you can usefully interact with it after exiting the
recursive edit?  That is, I think all the stuff that's bound in the
`debug' command (debugger-outer-match-data etc etc) has to continue to
be bound...

But perhaps that can be fixed?

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Juri Linkov]

>> A better question is why *Backtrace* is erased?
>> Often I accidentally quit the backtrace, then
>> try to switch to the *Backtrace* buffer to check
>> the backtrace again, but to no avail.
>
> I don't think you can usefully interact with it after exiting the
> recursive edit?  That is, I think all the stuff that's bound in the
> `debug' command (debugger-outer-match-data etc etc) has to continue to
> be bound...
>
> But perhaps that can be fixed?

I have no idea what will happen when it's not erased, need to try.
Hmm, interesting, after this all backtrace links are still valid:

diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
index 6c172d6c31..eb71b12341 100644
--- a/lisp/emacs-lisp/debug.el
+++ b/lisp/emacs-lisp/debug.el
@@ -308,13 +308,13 @@ debug
             ;; Restore previous state of debugger-buffer in case we were
             ;; in a recursive invocation of the debugger, otherwise just
             ;; erase the buffer.
-	    (when (buffer-live-p debugger-buffer)
-	      (with-current-buffer debugger-buffer
-	        (if debugger-previous-state
-                    (debugger--restore-buffer-state debugger-previous-state)
-                  (setq backtrace-insert-header-function nil)
-                  (setq backtrace-frames nil)
-                  (backtrace-print))))
+            ;; (when (buffer-live-p debugger-buffer)
+            ;;   (with-current-buffer debugger-buffer
+            ;;     (if debugger-previous-state
+            ;;         (debugger--restore-buffer-state debugger-previous-state)
+            ;;       (setq backtrace-insert-header-function nil)
+            ;;       (setq backtrace-frames nil)
+            ;;       (backtrace-print))))
 	    (with-timeout-unsuspend debugger-with-timeout-suspend)
 	    (set-match-data debugger-outer-match-data)))
         (setq debug-on-next-call debugger-step-after-exit)

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> I have no idea what will happen when it's not erased, need to try.
> Hmm, interesting, after this all backtrace links are still valid:

But doing commands like `e' doesn't work, because the context has been
lost.

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Drew Adams]

(Apologies for not following this thread.
Please ignore if not relevant.)

I'm just wondering whether option
`debugger-bury-or-kill' might be relevant here.

The default value is `bury'.  I'm guessing
maybe setting the value to `kill' would help
with what's being requested.

------------8<----------------
debugger-bury-or-kill is a variable defined in `debug.el'.

Its value is 'bury'

Documentation:
What to do with the debugger buffer when exiting `debug'.
The value affects the behavior of operations on any window
previously showing the debugger buffer.

nil means that if its window is not deleted when exiting the
  debugger, invoking `switch-to-prev-buffer' will usually show
  the debugger buffer again.

`append' means that if the window is not deleted, the debugger
  buffer moves to the end of the window's previous buffers so
  it's less likely that a future invocation of
  `switch-to-prev-buffer' will switch to it.  Also, it moves the
  buffer to the end of the frame's buffer list.

`bury' means that if the window is not deleted, its buffer is
  removed from the window's list of previous buffers.  Also, it
  moves the buffer to the end of the frame's buffer list.  This
  value provides the most reliable remedy to not have
  `switch-to-prev-buffer' switch to the debugger buffer again
  without killing the buffer.

`kill' means to kill the debugger buffer.

The value used here is passed to `quit-restore-window'.

You can customize this variable.

This variable was introduced, or its default value was changed, in
version 24.3 of Emacs.
------------8<----------------

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Eli Zaretskii]

> Cc: 55863@debbugs.gnu.org, Lars Ingebrigtsen <larsi@gnus.org>
> From: Juri Linkov <juri@linkov.net>
> Date: Thu, 09 Jun 2022 19:58:33 +0300
> 
> > (let ((debug-on-error t))
> >   (error "No chads please."))
> >
> > Then type "q", "C-x C-b", and note the empty lurker *Backtrace*.
> >
> > Apparently I'm the only one irked by this recurring bugaboo.
> 
> A better question is why *Backtrace* is erased?
> Often I accidentally quit the backtrace, then
> try to switch to the *Backtrace* buffer to check
> the backtrace again, but to no avail.

Happened to me as well, indeed.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Eli Zaretskii]

> Cc: 55863@debbugs.gnu.org, dick <dick.r.chiang@gmail.com>
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Thu, 09 Jun 2022 19:34:42 +0200
> 
> I don't think you can usefully interact with it after exiting the
> recursive edit?  That is, I think all the stuff that's bound in the
> `debug' command (debugger-outer-match-data etc etc) has to continue to
> be bound...

Even if the links don't work, the backtrace itself provides valuable
information (and fining the functions is trivial with M-. so we don't
really need the links).

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> I don't think you can usefully interact with it after exiting the
>> recursive edit?  That is, I think all the stuff that's bound in the
>> `debug' command (debugger-outer-match-data etc etc) has to continue to
>> be bound...
>
> Even if the links don't work, the backtrace itself provides valuable
> information (and fining the functions is trivial with M-. so we don't
> really need the links).

I was mostly thinking about the eval-in-frame stuff, which is what I
find most useful.

If it's hard to keep that around after exiting from the recursive edit,
we might just have an `inactive-backtrace' mode that disables the
commands that don't work?

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Eric Abrahamsen]

Juri Linkov <juri@linkov.net> writes:

>> (let ((debug-on-error t))
>>   (error "No chads please."))
>>
>> Then type "q", "C-x C-b", and note the empty lurker *Backtrace*.
>>
>> Apparently I'm the only one irked by this recurring bugaboo.
>
> A better question is why *Backtrace* is erased?
> Often I accidentally quit the backtrace, then
> try to switch to the *Backtrace* buffer to check
> the backtrace again, but to no avail.

FWIW I agree with this: I'm often annoyed that the backtrace is removed.
What's the harm in leaving it there?

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[dick]

> FWIW I agree with this: I'm often annoyed that the backtrace is
> removed.  What's the harm in leaving it there?

Because inhibit-debugger silently won't let you have more than one
active session.  This was as confusing to me as a edebug beginner as
when gdb inexplicably flies past a breakpoint.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Eric Abrahamsen]

On 06/09/22 15:34 PM, dick wrote:
>> FWIW I agree with this: I'm often annoyed that the backtrace is
>> removed.  What's the harm in leaving it there?
>
> Because inhibit-debugger silently won't let you have more than one
> active session.  This was as confusing to me as a edebug beginner as
> when gdb inexplicably flies past a breakpoint.

Fair enough -- I'm not surprised it's more complicated than I'd
considered. I do feel like I "lose" backtraces a lot, though.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

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

>> FWIW I agree with this: I'm often annoyed that the backtrace is
>> removed.  What's the harm in leaving it there?
>
> Because inhibit-debugger silently won't let you have more than one
> active session.  This was as confusing to me as a edebug beginner as
> when gdb inexplicably flies past a breakpoint.

Removing the text from the *Backtrace* buffer (or not) doesn't affect
whether `inhibit-debugger' is bound or not.  The `q' from the buffer
exits the recursive edit, which makes `inhibit-debugger' go back to its
normal value.

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[dick]

No one wants to see "*Backtrace*<2>" and "*Backtrace*<3>".

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

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

> No one wants to see "*Backtrace*<2>" and "*Backtrace*<3>".

I don't think anybody has proposed that?  Reusing the *Backtrace* buffer
is fine whether we erase the text in it or not on `q'.

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

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[dick]

I'm down for burying on "q" so long as subsequent debug's don't
generate-new-buffer to admit *Backtrace<2>* and *Backtrace<3>*.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[dick]

So I set about replacing kill-buffer with bury-buffer, then demoting
the *Backtrace* buffer from debugger-mode to backtrace-mode, and
realized maybe kill-buffer is best.

The confusion is we're accustomed to "q" as a passive bury, when
in fact "q" in debugger-mode corresponds to the highly un-passive
"debugger-quit".  To emphasize that, perhaps "q" in debugger-mode
should be gated by an "Are you sure?" yes-or-no-p.

Toting around old *Backtrace* buffers is fraught.  As GNU is really a
preservationist society moonlighting as software developers, I expect I
am, as usual, in the minority and will bow out of this particular
discuz.

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

> I'm down for burying on "q" so long as subsequent debug's don't
> generate-new-buffer to admit *Backtrace<2>* and *Backtrace<3>*.

bug#55863: 29.0.50; [PATCH] Avoid hanging chad of *Backtrace*

[Lars Ingebrigtsen]

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

> So I set about replacing kill-buffer with bury-buffer, then demoting
> the *Backtrace* buffer from debugger-mode to backtrace-mode, and
> realized maybe kill-buffer is best.

Ah, we already have a nice mode for "dead" backtrace buffers like this
(i.e., where `e' and friends don't work), so that makes it even easier.

So I've now done this on the trunk.

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