Make scroll-other-window respect target window remappings

* lisp/window.el (scroll-other-window, scroll-other-window-down):
Moved from window.c and change implementation so that they respect
command remappings in the target window (bug#20236).

3 files changed, 27 insertions, 32 deletions

diff --git a/etc/NEWS b/etc/NEWS
index fc7432669c3..88b4e59e267 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -587,6 +587,15 @@ available options can be restored by enabling this option.
 * Editing Changes in Emacs 29.1
 
 ---
+** 'scroll-other-window' and 'scroll-other-window-down' now respects remapping.
+These commands (bound to 'C-M-v' and 'C-M-V') used to scroll the other
+windows without looking a customizations in that other window.  These
+functions now check whether they have been rebound in the buffer in
+that other window, and then call the remapped function instead.  In
+addition, these commands now also respect the
+'scroll-error-top-bottom' user option.
+
+---
 ** Indentation of 'cl-flet' and 'cl-labels' has changed.
 These forms now indent like this:
 
diff --git a/lisp/window.el b/lisp/window.el
index 5ceec77bd32..9f787846124 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -10093,6 +10093,24 @@ If ARG is the atom `-', scroll upward by nearly full screen."
 
 (put 'scroll-down-command 'scroll-command t)
 
+(defun scroll-other-window (&optional lines)
+  "Scroll next window upward LINES lines; or near full screen if no ARG.
+See `scroll-up-command' for details."
+  (interactive "P")
+  (with-selected-window (other-window-for-scrolling)
+    (funcall (or (command-remapping #'scroll-up-command)
+                 #'scroll-up-command)
+             lines)))
+
+(defun scroll-other-window-down (&optional lines)
+  "Scroll next window downward LINES lines; or near full screen if no ARG.
+See `scroll-down-command' for details."
+  (interactive "P")
+  (with-selected-window (other-window-for-scrolling)
+    (funcall (or (command-remapping #'scroll-down-command)
+                 #'scroll-down-command)
+             lines)))
+
 ;;; Scrolling commands which scroll a line instead of full screen.
 
 (defun scroll-up-line (&optional arg)
diff --git a/src/window.c b/src/window.c
index cfe3977428b..6d28384eeb7 100644
--- a/src/window.c
+++ b/src/window.c
@@ -6334,36 +6334,6 @@ followed by all visible frames on the current terminal.  */)
   return window;
 }
 
-DEFUN ("scroll-other-window", Fscroll_other_window, Sscroll_other_window, 0, 1, "P",
-       doc: /* Scroll next window upward ARG lines; or near full screen if no ARG.
-A near full screen is `next-screen-context-lines' less than a full screen.
-Negative ARG means scroll downward.  If ARG is the atom `-', scroll
-downward by nearly full screen.  When calling from a program, supply
-as argument a number, nil, or `-'.
-
-The next window is usually the one below the current one;
-or the one at the top if the current one is at the bottom.
-It is determined by the function `other-window-for-scrolling',
-which see.
-
-Also see the `other-window-scroll-default' variable.  */)
-  (Lisp_Object arg)
-{
-  specpdl_ref count = SPECPDL_INDEX ();
-  scroll_command (Fother_window_for_scrolling (), arg, 1);
-  return unbind_to (count, Qnil);
-}
-
-DEFUN ("scroll-other-window-down", Fscroll_other_window_down,
-       Sscroll_other_window_down, 0, 1, "P",
-       doc: /* Scroll next window downward ARG lines; or near full screen if no ARG.
-For more details, see the documentation for `scroll-other-window'.  */)
-  (Lisp_Object arg)
-{
-  specpdl_ref count = SPECPDL_INDEX ();
-  scroll_command (Fother_window_for_scrolling (), arg, -1);
-  return unbind_to (count, Qnil);
-}
 
 DEFUN ("scroll-left", Fscroll_left, Sscroll_left, 0, 2, "^P\np",
        doc: /* Scroll selected window display ARG columns left.
@@ -8608,8 +8578,6 @@ displayed after a scrolling operation to be somewhat inaccurate.  */);
   defsubr (&Sscroll_left);
   defsubr (&Sscroll_right);
   defsubr (&Sother_window_for_scrolling);
-  defsubr (&Sscroll_other_window);
-  defsubr (&Sscroll_other_window_down);
   defsubr (&Sminibuffer_selected_window);
   defsubr (&Srecenter);
   defsubr (&Swindow_text_width);