Subject: Re: bug#28621: Proposed patch for doc of posn-window and code of posn-set-point to handle frame arguments

From: Lars Ingebrigtsen <[email-masked]>
Date: Mon, 24 Aug 2020 15:29:13 +0200

(This is the patch itself -- it didn't apply because it was posted as
HTML.)

diff --git a/lisp/subr.el b/lisp/subr.el
index a58a873a33..12d7383600 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1364,7 +1364,7 @@ event-start
 The following accessor functions are used to access the elements
 of the position:
 
-`posn-window': The window the event is in.
+`posn-window': The window or frame of the event end.
 `posn-area': A symbol identifying the area the event occurred in,
 or nil if the event occurred in the text area.
 `posn-point': The buffer position of the event.
@@ -1420,8 +1420,9 @@ posnp
 
 (defsubst posn-window (position)
   "Return the window in POSITION.
-POSITION should be a list of the form returned by the `event-start'
-and `event-end' functions."
+If POSITION is outside the frame where the event was initiated,
+return that frame instead.  POSITION should be a list of the form
+returned by the `event-start' and `event-end' functions."
   (nth 0 position))
 
 (defsubst posn-area (position)
@@ -1448,9 +1449,14 @@ posn-point
 (defun posn-set-point (position)
   "Move point to POSITION.
 Select the corresponding window as well."
-  (if (not (windowp (posn-window position)))
+  (if (framep (posn-window position))
+      (progn
+        (unless (windowp (frame-selected-window (posn-window position)))
+          (error "Position not in text area of window"))
+        (select-window (frame-selected-window (posn-window position))))
+    (unless (windowp (posn-window position))
       (error "Position not in text area of window"))
-  (select-window (posn-window position))
+    (select-window (posn-window position)))
   (if (numberp (posn-point position))
       (goto-char (posn-point position))))

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no