Fix invocation of File->Close from the menu bar

* lisp/simple.el (kill-buffer--possibly-save): Don't request
LONG-FORM from 'read-multiple-choice' if GUI dialog should be
used.
* lisp/emacs-lisp/rmc.el (read-multiple-choice): Doc fix.
(read-multiple-choice--short-answers): Don't append "?" to
CHOICES and don't display the prompt in the echo area if GUI
dialog is used.  Use 'use-dialog-box-p'.  (Bug#61553)

lisp/emacs-lisp/rmc.el

@@ -162,8 +162,10 @@ dialogs.  Otherwise, the function will always use text-mode dialogs.
 
 The return value is the matching entry from the CHOICES list.
 
-If LONG-FORM, do a `completing-read' over the NAME elements in
-CHOICES instead.
+If LONG-FORM is non-nil, do a `completing-read' over the NAME elements
+in CHOICES instead.  In this case, GUI dialog is not used, regardless
+of the value of `use-dialog-box' and whether the function was invoked
+via a mouse gesture.
 
 Usage example:
 
@@ -177,8 +179,9 @@ Usage example:
      prompt choices help-string show-help)))
 
 (defun read-multiple-choice--short-answers (prompt choices help-string show-help)
-  (let* ((prompt-choices
-          (if show-help choices (append choices '((?? "?")))))
+  (let* ((dialog-p (use-dialog-box-p))
+         (prompt-choices
+          (if (or show-help dialog-p) choices (append choices '((?? "?")))))
          (altered-names (mapcar #'rmc--add-key-description prompt-choices))
          (full-prompt
           (format
@@ -192,16 +195,14 @@ Usage example:
             (setq buf (rmc--show-help prompt help-string show-help
                                       choices altered-names)))
 	(while (not tchar)
-	  (message "%s%s"
-                   (if wrong-char
-                       "Invalid choice.  "
-                     "")
-                   full-prompt)
+          (unless dialog-p
+	    (message "%s%s"
+                     (if wrong-char
+                         "Invalid choice.  "
+                       "")
+                     full-prompt))
           (setq tchar
-                (if (and (display-popup-menus-p)
-                         last-input-event ; not during startup
-                         (consp last-nonmenu-event)
-                         use-dialog-box)
+                (if dialog-p
                     (x-popup-dialog
                      t
                      (cons prompt

lisp/simple.el

@@ -10801,7 +10801,8 @@ If the buffer doesn't exist, create it first."
            '((?y "yes" "kill buffer without saving")
              (?n "no" "exit without doing anything")
              (?s "save and then kill" "save the buffer and then kill it"))
-           nil nil (not use-short-answers)))))
+           nil nil (and (not use-short-answers)
+                        (not (use-dialog-box-p)))))))
     (if (equal response "no")
         nil
       (unless (equal response "yes")