bug#56696: [PATCH] 29.0.50; compile.el doesn't always clean up after itself

["João Távora" <joaotavora@gmail.com>]

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Hello maintainers,

compile.el, which runs user code, doesn't use `unwind-protect` in its
process sentinel.  I really think it should.

I noticed this while playing around with the excellent rmsbolt.el of Jay
Kamat, which makes use of compilation-finish-functions.  If ones of
these functions errors, the user is stuck with a "[Compiling]" in her
modeline, even if compilation has long finished.

Let me know if there are any objections to this patch:


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From de8025f19a7fe0cc37beeed61f4c1269de3519af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20T=C3=A1vora?= <joaotavora@gmail.com>
Date: Fri, 22 Jul 2022 09:23:02 +0100
Subject: [PATCH] Clean up more robustly in compile.el

* lisp/progmodes/compile.el (compilation-sentinel): Use
unwind-protect.
---
 lisp/progmodes/compile.el | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index c71a50d4fd..a665fccc73 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -2464,22 +2464,23 @@ compilation-handle-exit
 (defun compilation-sentinel (proc msg)
   "Sentinel for compilation buffers."
   (if (memq (process-status proc) '(exit signal))
-      (let ((buffer (process-buffer proc)))
-	(if (null (buffer-name buffer))
-	    ;; buffer killed
-	    (set-process-buffer proc nil)
-	  (with-current-buffer buffer
-	    ;; Write something in the compilation buffer
-	    ;; and hack its mode line.
-	    (compilation-handle-exit (process-status proc)
-				     (process-exit-status proc)
-				     msg)
-	    ;; Since the buffer and mode line will show that the
-	    ;; process is dead, we can delete it now.  Otherwise it
-	    ;; will stay around until M-x list-processes.
-	    (delete-process proc)))
+      (unwind-protect
+          (let ((buffer (process-buffer proc)))
+            (if (null (buffer-name buffer))
+                ;; buffer killed
+                (set-process-buffer proc nil)
+              (with-current-buffer buffer
+                ;; Write something in the compilation buffer
+                ;; and hack its mode line.
+                (compilation-handle-exit (process-status proc)
+                                         (process-exit-status proc)
+                                         msg))))
         (setq compilation-in-progress (delq proc compilation-in-progress))
-        (compilation--update-in-progress-mode-line))))
+        (compilation--update-in-progress-mode-line)
+        ;; Since the buffer and mode line will show that the
+        ;; process is dead, we can delete it now.  Otherwise it
+        ;; will stay around until M-x list-processes.
+        (delete-process proc))))
 
 (defun compilation-filter (proc string)
   "Process filter for compilation buffers.
-- 
2.37.0


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João