bug#38413: 27.0.50; [PATCH] python.el: Check if buffer `python-pdbtrack-tracked-buffer' is live.

bug#38413: 27.0.50; [PATCH] python.el: Check if buffer `python-pdbtrack-tracked-buffer' is live.

[Andrii Kolomoiets]

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1. echo 'import pdb; pdb.set_trace()' > test.py
2. emacs -Q
3. M-x run-python
4. M-x python-shell-send-file <RET> test.py
5. C-x k test.py
6. c <RET>

Leads to error:
python-pdbtrack-tracking-finish: Selecting deleted buffer


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From cf8a031307bd21da448982c0ae9ceaf9ac5616cd Mon Sep 17 00:00:00 2001
From: Andrii Kolomoiets <andreyk.mad@gmail.com>
Date: Thu, 28 Nov 2019 15:54:41 +0200
Subject: [PATCH] python.el: Call buffer-live-p in
 python-pdbtrack-unset-tracked-buffer

* lisp/progmodes/python.el (python-pdbtrack-unset-tracked-buffer):
Check if buffer `python-pdbtrack-tracked-buffer' is live.
---
 lisp/progmodes/python.el | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index e720c6eb6a..1b3b92deaf 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -3832,10 +3832,10 @@ python-pdbtrack-set-tracked-buffer
 
 (defun python-pdbtrack-unset-tracked-buffer ()
   "Untrack currently tracked buffer."
-  (when python-pdbtrack-tracked-buffer
+  (when (buffer-live-p python-pdbtrack-tracked-buffer)
     (with-current-buffer python-pdbtrack-tracked-buffer
-      (set-marker overlay-arrow-position nil))
-    (setq python-pdbtrack-tracked-buffer nil)))
+      (set-marker overlay-arrow-position nil)))
+  (setq python-pdbtrack-tracked-buffer nil))
 
 (defun python-pdbtrack-tracking-finish ()
   "Finish tracking."
-- 
2.15.1

bug#38413: 27.0.50; [PATCH] python.el: Check if buffer `python-pdbtrack-tracked-buffer' is live.

[Eli Zaretskii]

> From: Andrii Kolomoiets <andreyk.mad@gmail.com>
> Date: Thu, 28 Nov 2019 16:03:30 +0200
> 
> 1. echo 'import pdb; pdb.set_trace()' > test.py
> 2. emacs -Q
> 3. M-x run-python
> 4. M-x python-shell-send-file <RET> test.py
> 5. C-x k test.py
> 6. c <RET>
> 
> Leads to error:
> python-pdbtrack-tracking-finish: Selecting deleted buffer

Thanks, pushed to the master branch.