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

[dick . r . chiang]

>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



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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mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils
mailheader gnus-win paredit-ext paredit subed subed-vtt subed-srt
subed-common subed-mpv subed-debug subed-config inf-ruby ruby-mode smie
company pcase haskell-interactive-mode haskell-presentation-mode
haskell-process haskell-session haskell-compile haskell-mode
haskell-cabal haskell-utils haskell-font-lock haskell-indentation
haskell-string haskell-sort-imports haskell-lexeme haskell-align-imports
haskell-complete-module haskell-ghc-support noutline outline
flymake-proc flymake warnings etags fileloop generator dabbrev
haskell-customize hydra lv use-package-ensure solarized-theme
solarized-definitions projectile lisp-mnt ibuf-ext ibuffer
ibuffer-loaddefs thingatpt magit-autorevert autorevert filenotify
magit-git magit-base magit-section format-spec crm dash rx compat-27
compat-26 compat grep compile comint ansi-color gnus nnheader range
mail-utils mm-util mail-prsvr gnus-util text-property-search time-date
flx-ido flx google-translate-default-ui google-translate-core-ui
facemenu color ido google-translate-core google-translate-tk
google-translate-backend use-package-bind-key bind-key auto-complete
easy-mmode advice edmacro kmacro popup cus-edit pp cus-load wid-edit
emms-player-mplayer emms-player-simple emms emms-compat cl-extra
help-mode xref project use-package-core derived hl-line winner ring
finder-inf json-reformat-autoloads json-snatcher-autoloads
projectile-autoloads sml-mode-autoloads tornado-template-mode-autoloads
info package browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util mailcap
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map url-vars seq gv subr-x byte-opt
bytecomp byte-compile cconv cldefs cl-loaddefs cl-lib iso-transl tooltip
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tree-sitter tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer nadvice
simple cl-generic indonesian philippine cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs faces cus-face macroexp files window text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 1227829 176046)
 (symbols 48 53502 23)
 (strings 32 237869 24639)
 (string-bytes 1 7132157)
 (vectors 16 141025)
 (vector-slots 8 2909657 195769)
 (floats 8 1371 3219)
 (intervals 56 60221 5281)
 (buffers 1000 51))