* lisp/term/x-win.el (x-menu-bar-open): Always pass last-nonmenu-event.

* lisp/subr.el (eventp): `nil' is not an event, and eventp is not hot.
(event-start, event-end): Use posn-at-point to return a more
informative posn.
(posnp): New function.
* lisp/mouse.el (popup-menu-normalize-position): Use it.

etc/NEWS

@@ -556,6 +556,8 @@ are deprecated and will be removed eventually.
 
 ** New functions `autoloadp' and `autoload-do-load'.
 
+** New function `posnp' to test if an object is a `posn'.
+
 ** `function-get' fetches the property of a function, following aliases.
 
 ** `toggle-read-only' accepts a second argument specifying whether to

lisp/ChangeLog

+2012-08-10  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+	* term/x-win.el (x-menu-bar-open): Always pass last-nonmenu-event.
+	* subr.el (eventp): `nil' is not an event, and eventp is not hot.
+	(event-start, event-end): Use posn-at-point to return a more
+	informative posn.
+	(posnp): New function.
+	* mouse.el (popup-menu-normalize-position): Use it.
+
 2012-08-10  Masatake YAMATO  <yamato@redhat.com>
 
 	* mouse.el (popup-menu-normalize-position): New function.

lisp/mouse.el

-;;; mouse.el --- window system-independent mouse support
+;;; mouse.el --- window system-independent mouse support  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 1993-1995, 1999-2012 Free Software Foundation, Inc.
 
@@ -151,35 +151,24 @@ PREFIX is the prefix argument (if any) to pass to the command."
       (call-interactively cmd))))
 
 (defun popup-menu-normalize-position (position)
-  "Converts the POSITION to the form which `popup-menu' expects internally.
-POSITION can be nil, an click event, a posn- value, or a value having
-form ((XOFFSET YOFFSET) WINDOW).
-If nil, the current mouse position is used.
-If an click event, the value returend from `event-end' is used."
+  "Convert the POSITION to the form which `popup-menu' expects internally.
+POSITION can an event, a posn- value, a value having
+form ((XOFFSET YOFFSET) WINDOW), or nil.
+If nil, the current mouse position is used."
   (pcase position
     ;; nil -> mouse cursor position
-    ;; this pattern must be before `eventp' because
-    ;; nil is an event.
     (`nil
      (let ((mp (mouse-pixel-position)))
        (list (list (cadr mp) (cddr mp)) (car mp))))
-    ;; value returned from (event-end (read-event)) or (posn-at-point)
-    ((or `(,window ,area-or-pos (,x . ,y)
-		   ,timestamp ,object ,pos (,col . ,row)
-		   ,image (,dx . ,dy) (,width . ,height))
-	 `(,window ,pos (0 . 0) 0))
+    ;; Value returned from `event-end' or `posn-at-point'.
+    ((pred posnp)
      (let ((xy (posn-x-y position)))
        (list (list (car xy) (cdr xy))
 	     (posn-window position))))
-    ;; pattern expected by popup-menu
-    (`((,xoffset ,yoffset) ,window)
-     position)
-    ;; event
+    ;; Event.
     ((pred eventp)
      (popup-menu-normalize-position (event-end position)))
-    ;; rejects
-    (t
-     (error "Unexpected position form"))))
+    (t position)))
 
 (defun minor-mode-menu-from-indicator (indicator)
   "Show menu for minor mode specified by INDICATOR.

lisp/subr.el

@@ -907,11 +907,12 @@ The normal global definition of the character C-x indirects to this keymap.")
 			  c)))
 	    key)))
 
-(defsubst eventp (obj)
+(defun eventp (obj)
   "True if the argument is an event object."
-  (or (integerp obj)
-      (and (symbolp obj) obj (not (keywordp obj)))
-      (and (consp obj) (symbolp (car obj)))))
+  (when obj
+    (or (integerp obj)
+        (and (symbolp obj) obj (not (keywordp obj)))
+        (and (consp obj) (symbolp (car obj))))))
 
 (defun event-modifiers (event)
   "Return a list of symbols representing the modifier keys in event EVENT.
@@ -975,7 +976,7 @@ in the current Emacs session, then this function may return nil."
   ;; is this really correct? maybe remove mouse-movement?
   (memq (event-basic-type object) '(mouse-1 mouse-2 mouse-3 mouse-movement)))
 
-(defsubst event-start (event)
+(defun event-start (event)
   "Return the starting position of EVENT.
 EVENT should be a click, drag, or key press event.
 If it is a key press event, the return value has the form
@@ -990,9 +991,10 @@ If EVENT is a mouse or key press or a mouse click, this is the
 position of the event.  If EVENT is a drag, this is the starting
 position of the drag."
   (if (consp event) (nth 1 event)
-    (list (selected-window) (point) '(0 . 0) 0)))
+    (or (posn-at-point)
+        (list (selected-window) (point) '(0 . 0) 0))))
 
-(defsubst event-end (event)
+(defun event-end (event)
   "Return the ending location of EVENT.
 EVENT should be a click, drag, or key press event.
 If EVENT is a key press event, the return value has the form
@@ -1009,7 +1011,8 @@ If EVENT is a mouse or key press or a mouse click, this is the
 position of the event.  If EVENT is a drag, this is the starting
 position of the drag."
   (if (consp event) (nth (if (consp (nth 2 event)) 2 1) event)
-    (list (selected-window) (point) '(0 . 0) 0)))
+    (or (posn-at-point)
+        (list (selected-window) (point) '(0 . 0) 0))))
 
 (defsubst event-click-count (event)
   "Return the multi-click count of EVENT, a click or drag event.
@@ -1018,6 +1021,13 @@ The return value is a positive integer."
 
 ;;;; Extracting fields of the positions in an event.
 
+(defun posnp (obj)
+  "Return non-nil if OBJ appears to be a valid `posn' object."
+  (and (windowp (car-safe obj))
+       (atom (car-safe (setq obj (cdr obj))))                ;AREA-OR-POS.
+       (integerp (car-safe (car-safe (setq obj (cdr obj))))) ;XOFFSET.
+       (integerp (car-safe (cdr obj)))))                     ;TIMESTAMP.
+
 (defsubst posn-window (position)
   "Return the window in POSITION.
 POSITION should be a list of the form returned by the `event-start'

lisp/term/x-win.el

@@ -1306,17 +1306,14 @@ Request data types in the order specified by `x-select-request-type'."
 
 (defun x-menu-bar-open (&optional frame)
   "Open the menu bar if it is shown.
-`popup-menu' is used if it is off "
+`popup-menu' is used if it is off."
   (interactive "i")
   (cond
    ((and (not (zerop (or (frame-parameter nil 'menu-bar-lines) 0)))
 	 (fboundp 'accelerate-menu))
     (accelerate-menu frame))
    (t
-    (popup-menu (mouse-menu-bar-map)
-		(if (listp last-nonmenu-event)
-		    nil
-		  (posn-at-point))))))
+    (popup-menu (mouse-menu-bar-map) last-nonmenu-event))))
 
 
 ;;; Window system initialization.