Fix "C-h k" when clicking on another frame

* lisp/help.el (help--analyze-key): Don't barf if the key sequence
includes a switch-frame event.  (Bug#59785)

2 files changed, 5 insertions, 3 deletions

diff --git a/lisp/help.el b/lisp/help.el
index 8e1b325141e..b709062cb27 100644
--- a/lisp/help.el
+++ b/lisp/help.el
@@ -861,11 +861,13 @@ in the selected window."
          (mouse-msg (if (or (memq 'click modifiers) (memq 'down modifiers)
                             (memq 'drag modifiers))
                         " at that spot" ""))
+         (click-pos (event-end event))
          ;; Use `posn-set-point' to handle the case when a menu item
          ;; is selected from the context menu that should describe KEY
          ;; at the position of mouse click that opened the context menu.
-         ;; When no mouse was involved, don't use `posn-set-point'.
-         (defn (if buffer
+         ;; When no mouse was involved, or the event doesn't provide a
+         ;; valid position, don't use `posn-set-point'.
+         (defn (if (or buffer (not (consp click-pos)))
                    (key-binding key t)
                  (save-excursion (posn-set-point (event-end event))
                                  (key-binding key t)))))
diff --git a/lisp/subr.el b/lisp/subr.el
index 21f43092d42..dc219a49a74 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1729,7 +1729,7 @@ and `event-end' functions."
      ((eq area 'horizontal-scroll-bar)
       (cons (scroll-bar-scale pair (window-width window)) 0))
      (t
-      (if use-window
+      (if (and (windowp frame-or-window) use-window)
           (cons (/ (car pair) (window-font-width window))
                 (/ (cdr pair) (window-font-height window)))
         ;; FIXME: This should take line-spacing properties on