bug#35055: 27.0.50; async-shell-command truncates output lines

[Juri Linkov <juri@linkov.net>]

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>> Do you agree with this change?
>
> Yes, with the minor remarks:
>
>> +  The option @code{async-shell-command-width} defines the number of display
>> +columns available for output of asynchronous or remote shell commands.
>
> Do not mention remote.
>
>> +*** 'async-shell-command-width' defines the number of display columns
>>  available for output of asynchronous or remote shell commands.
>
> dito.
>
>> +(defcustom async-shell-command-width nil
>> +  "Number of display columns available for asynchronous/remote shell command.
>
> dito.
>
>> +      ;; Test `async-shell-command-width' of `async-shell-command'.
>
> `async-shell-command' shouldn't be mentioned anymore, it's obvious.

I hope now it's right:


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diff --git a/doc/emacs/misc.texi b/doc/emacs/misc.texi
index 7d7065a441..5f74392736 100644
--- a/doc/emacs/misc.texi
+++ b/doc/emacs/misc.texi
@@ -775,6 +775,13 @@ Single Shell
 displayed only when the command generates output, set
 @code{async-shell-command-display-buffer} to @code{nil}.
 
+@vindex async-shell-command-width
+  The option @code{async-shell-command-width} defines the number of display
+columns available for output of asynchronous shell commands.
+A positive integer tells the shell to use that number of columns for
+command output.  The default value is @code{nil} that means to use
+the same number of columns as provided by the shell.
+
 @kindex M-|
 @findex shell-command-on-region
   @kbd{M-|} (@code{shell-command-on-region}) is like @kbd{M-!}, but
diff --git a/etc/NEWS b/etc/NEWS
index 9e3559d27e..5e948452d8 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1103,8 +1103,8 @@ variable for remote shells.  It still defaults to "/bin/sh".
 ** Single shell commands
 
 ---
-*** 'shell-command-width' defines the number of display columns
-available for output of asynchronous or remote shell commands.
+*** 'async-shell-command-width' defines the number of display columns
+available for output of asynchronous shell commands.
 
 ** Pcomplete
 
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 2e1a0960d7..c0446b79a7 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -3639,10 +3639,10 @@ tramp-handle-shell-command
 
     (if (and (not current-buffer-p) (integerp asynchronous))
 	(let ((tramp-remote-process-environment
-	       ;; `shell-command-width' has been introduced with Emacs 27.1.
-	       (if (natnump (bound-and-true-p shell-command-width))
+	       ;; `async-shell-command-width' has been introduced with Emacs 27.1.
+	       (if (natnump (bound-and-true-p async-shell-command-width))
 		   (cons (format "COLUMNS=%d"
-				 (bound-and-true-p shell-command-width))
+				 (bound-and-true-p async-shell-command-width))
 			 tramp-remote-process-environment)
 		 tramp-remote-process-environment)))
 	  (prog1
diff --git a/lisp/simple.el b/lisp/simple.el
index acea1f9ddc..4454791ad2 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -3353,7 +3353,7 @@ async-shell-command-display-buffer
   :group 'shell
   :version "26.1")
 
-(defcustom shell-command-width nil
+(defcustom async-shell-command-width nil
   "Number of display columns available for asynchronous shell command output.
 If nil, use the shell default number (usually 80 columns).
 If a positive integer, tell the shell to use that number of columns for
@@ -3627,8 +3627,8 @@ shell-command
                   (shell-command--save-pos-or-erase)
 		  (setq default-directory directory)
 		  (let ((process-environment
-			 (if (natnump shell-command-width)
-			     (cons (format "COLUMNS=%d" shell-command-width)
+			 (if (natnump async-shell-command-width)
+			     (cons (format "COLUMNS=%d" async-shell-command-width)
 				   process-environment)
 			   process-environment)))
 		    (setq proc
diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index cba697da18..7d3c43408d 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -4192,18 +4192,17 @@ tramp--test-shell-command-to-string-asynchronously
 	;; Cleanup.
 	(ignore-errors (delete-file tmp-name)))
 
-      ;; Test `shell-command-width' of `async-shell-command'.
-      ;; Since Emacs 27.1.
-      (when (and (boundp 'shell-command-width)
+      ;; Test `async-shell-command-width'.  Since Emacs 27.1.
+      (when (and (boundp 'async-shell-command-width)
 		 (zerop (call-process "tput" nil nil nil "cols"))
                  (zerop (process-file "tput" nil nil nil "cols")))
-	(let (shell-command-width)
+	(let (async-shell-command-width)
 	  (should
 	   (string-equal
 	    (format "%s\n" (car (process-lines "tput" "cols")))
 	    (tramp--test-shell-command-to-string-asynchronously
 	     "tput cols")))
-	  (setq shell-command-width 1024)
+	  (setq async-shell-command-width 1024)
 	  (should
 	   (string-equal
 	    "1024\n"