bug#69420: 29.2; iSQL point/process-mark fix

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 26 Feb 2024 23:56:05 -0500
> From: Gary Hollis <ghollisjr@gmail.com>
> 
> When the point is not at the very end of the iSQL buffer, the
> process-mark is not kept in a reasonable state if sql-send-string is
> called.
> 
> Example to reproduce bug:
> 1. Open a sql-mode buffer.
> 2. Connect to a SQL database of choice.
> 3. Move the point of the iSQL buffer to the top, e.g. with M-<
> 4. Send good queries via sql-send-string, sql-send-region etc.
> 5. In iSQL buffer, move point to end, e.g. with M->
> 6. Enter a good query.
> 
> Expected result: The new query successfully sends and sql process 
> returns output.
> Actual result: Whatever contents had been output from the 
> sql-send-string, sql-send-region etc. will be sent along with the new query.
> 
> To fix: a call to (end-of-buffer) can be placed within the
> (save-excursion ...) context before sending any input in the
> sql-send-string function, e.g.
> 
> ;; from sql.el with fix for bug added with BUG FIX comment:
> (defun sql-send-string (str)
>    "Send the string STR to the SQL process."
>    (interactive "sSQL Text: ")
> 
>    (let ((comint-input-sender-no-newline nil)
>          (s (replace-regexp-in-string "[[:space:]\n\r]+\\'" "" str)))
>      (if (sql-buffer-live-p sql-buffer)
>      (progn
>        ;; Ignore the hoping around...
>        (save-excursion
>          ;; Set product context
>          (with-current-buffer sql-buffer
>                (end-of-buffer) ; BUG FIX: correct point before sending input
>                (when sql-debug-send
>                  (message ">>SQL> %S" s))
>                (insert "\n")
>                (comint-set-process-mark)
> 
>            ;; Send the string (trim the trailing whitespace)
>            (sql-input-sender (get-buffer-process (current-buffer)) s)
> 
>            ;; Send a command terminator if we must
>            (sql-send-magic-terminator sql-buffer s sql-send-terminator)
> 
>                (when sql-pop-to-buffer-after-send-region
>              (message "Sent string to buffer %s" sql-buffer))))
> 
>        ;; Display the sql buffer
>        (sql-display-buffer sql-buffer))
> 
>        ;; We don't have no stinkin' sql
>        (user-error "No SQL process started"))))
> 

Thanks.

Michael, any comments or suggestions?